AND HYDROPHORUS COLLECTED IN ALASKA IN 1921,

TWO-WINGED FLIES OF THE GENERA DOLICHOPUS AND HYDROPHORUS COLLECTED IN ALASKA IN

1921,

WITH NEW SPECIES OF DOLICHOPUS FROM NORTH AMERICA AND HAWAII.

By

J.

M.

Aldrich,

Associate Curator, Division of Insects, United States NationalMuseum.

The

presentpaperis a reportonthe material inthe genera

DoU-

chopus and Hydrophorus, ofthe Dipterous family Dolichopodidae, collectedbythewriterinAlaskaduringJune andJuly, 1921;italso contains additional

new

species of Dolichopus from Labrador, the United States, and Hawaii.

Among

thelocalitiescitedare

Camps

327 and 334; these aretem- porary namesforpoints ontheGovernmentrailroadinAlaska, the numbers ^{indicating the miles} from

Seward

at the south end; they arebothinthe south edgeofthe

Yukon

Basin,onthe

Nenana

River, inacanyon betweenmountains. Healy^{is358 miles}from Seward.

Camp

334 haslatelybeen giventhepermanent

name

of Carlo,and

Camp

327thatof

Windy,

assidingsontherailroad.

Genus

DOLICHOPUS

Latreille.

Dolichopus Latreille,PrgcisdesCaracteres G§neriquesdes Insectes, Paris.

1796, p. 159.—LoEW, Smiths, Misc. Colls., No. 171, pp. ^18. 323, 1864.—

Feey,ActaSocietatisproFaunaetFlora Feunica,vol. 40,No.5,pp. 1-27, 1915.—Becker, Nova Acta, vol. 102, part 2. pp. 126-180, 1921.—Van DuzEE, Cole,and Aldrich,Bulletin 116,U. S.Nat. Mus., 1921, 304pp., 16plates.

In spiteof the factthat 218 species of thisremarkable genus are describedforNorth Americain Bulletin 116justcited,

my work

in Alaskayielded5

new

species and2

European

not previously

known

from North America^{;while 15}previously describedNorth American specieswerealso collected,ofwhich 8hadnever been reportedfrom Alaska.

DOLICHOPUSMANICULAVanDuzee, Cole,andAldrich.

Dolichopus maniculaVanDuzee, Cole,andAldrich,Bull. 116, U.S.Nat.

Mus.,p. 56.

Fourteenspecimens,Skagway,Alaska. Originally describedfrom high altitudes in Colorado,

New

Mexico,and

Wyoming.

No.2446—ProceedingsU.S. National Museum,Vol.61,Art. 25

2 PROCEEDINGS OF

THE NATIONAL MUSEUM.

vol.61.

DOLICHOPUS ANNULIPESZetterstcdt.

Doliclioimsannulipcs Zettekstedt,InsectaLapponica,183S,p. 710.

BolichopusstenhammariZetterstedt, Diptera Scandiuaviae,vol._2,p.521,

1843.—VanDuzee,Cole,andAldrich, Bull.116,U. S.Nat. Mus.,p.59, 1921.

Two

specimens,Healy and Nenana,Alaska. Describedfrom Lap- land and

common

in northern Europe; has been reported several times from Alaska and Labrador, andonespecimen is

known

from

New Hampshire

(White Mountains). According toFrey,itoccurs allover Finland,andisespecially characteristicofLapland. I here follow Becker's

monograph

inacceptinganmdipesasnotpreoccupied byPorphijro'ps annulipes of Meigen.

DOLICHOPUSXANTHOCNEMUS Loew.

. DoKchopus xanthoenemusLoew,Smiths. Misc.Colls.,No.171.p.31,1864.—

VanDuzee,Cole,andAldrich,Bull.116,U.S.Nat. Mus.,p. 84,1921.

Nineteen specimens, from Seward, Anchorage,

Camp

327, and Fairbanks, Alaska. Originally described from Sitka, and since recordedseveraltimes fromAlaska.

DOLICHOPUS GROENLANDICUSZetterstedt.

Dolichopns groenlandicus Zetterstedt, Diptera Scandiuaviae,vol.2,p. 528, 1843.—Van Duzee,Cole,andAldrich,Bull. 116,U. S.Nat. Mus.,p.94, 1921.

Ninety-four specimens, from Seward, Anchorage,

Camps

327 and 344, Healy, and P'airbanks,Alaska, June and July. Originally de- scribed from Greenland and later reported from northern Europe.

Bulletin 116 recordsitfrom Labrador andaspecimenfromColorado.

WhilethatpaperwasinpreparationI collected a series atTennessee Pass,Colorado,altitudealittleover10,000 feet (3.05 kilometers).

DOLICHOPUS SOLIDUSVanDuzee. Cole,andAldrich.

Dolichopnssolidus Van Duzee, Cole, and Aldrich, Bull.116, U. S.Nat.

Mus., p.104,1921.

Thirteen specimens, bothsexes,Anchorage,

Camp

327, andHealy, Alaska,June15and July^7. Describedfroma singlemaletakenon theAlaska-

Yukon

boundarynear the Arctic Ocean.

The

fronttarsi

weremissingin the type. I findthatthey areof peculiar and dis- tinguishingstructure,beingflattenedhorizontally (depressed).

The

second and third joints are very thin as viewed from above, and the fourthandfifth are widened (depressed) and fringed laterally.

Secondand thirdofequallength,togetherequaling thefirst. I ob- tained a male and two females of this species at Tennessee Pass, Colorado.July9 and 10,1919.

^m.'^o.

XEW

SPECIES OF

THE GENUS

DOLICHOPUS ALDKIOH. 6 DOLICHOPUS RUPESTRIS Haliday.

DoUchopus rupestris Haliday, Entomologists' Magazine, vol. 1, 1833, p.

164.—VanDuzee,Cole, and Aldrich, Bull. 116, U. S.Nat. Mus.,p.112, 1921.

DoUchopusfestinansZetteestedt,InsectaLapponica,_1838,p.708.

Fourteenspecimens,fromHealy.and

Camps

327and334,Alaska, June26 toJuly 13. Described from GreatBritain andwell

known

from nortliern Europe. Frey saysit is very rare in Southern Fin- land,butone ofthecomm.onerspeciesof the genusinLapland and on theKolaPeninsula.

DOLICHOPUS BREVIPENNIS^Meigen.

DoUchopushrempennis Meigen,Syst.Bcsclir., vol.4, p.89, 1824.-

—

VanDuzee, Cole,andAldkich,Bull. 116,p.130,1921.

Thirty specimens,fromHurricane,

Camp

334, andHealy, Alaska, June29toJuly3. Originally describedfrom

Germany

;

common

in

Denmark

(Lundbeck);

common

throughout Finland (Frey). First reportedfrom North America by Osten Sacken,on the identification of

Loew

; only afemale remainsof thislot inthe

Museum

of

Com-

parative Zoology, Cambridge, Massachusetts, and the species ap- parentlyhas not beencollectedinNorthAmericaagainuntilnow.

DOLICHOPUS RAMIFER Loew.

DoUchopus rainifer Loew, Neue Beitriige, No. _8, p. 19, 1861; Smiths.

Misc.Colls.,No._171, p.52. 1864.—VanDuzee,Cole, andAldrich, Bull, 116.U. S.Nat. Mus.,p.147.1921.

Two

specimens, Fairbanks, Alaska. July 1.

The

speciesoccurs as far south asIndiana andKansas, andeven LosAngeles,California.

DOLICHOPUS OBCORDATUS^Aldrich.

DoUchopusohcordatus Aldrich, KansasUniv. Quarterly,p.14,1893.

—

Van Duzee,Cole,and Aldrich,Bull. 116, U.S.Nat. Mus.,p.173,1921.

Four

^specimens,FairbanksandHealy, Alaska,June26toJuly3.

A common

species in thewestern mountainsof theUnitedStates,not hitherto reported farther north than Nelson.^BritishColumbia.

DOLICHOPUS PLUMIPESScoDoli.

MuscaplumipesScopoli,Entomologiacarnlolica, 1763,p.334.

DoUchopusplumipesVanDuzee, Cole,andAldrich,Bull. 116. U. S.Nat.

Mus.,p.183, 1921.

Sixteen specimens,from Seward. Anchorage,Healy,andFairbanks, Alaska. DescribedfromCarniola,the speciesextends widelythrough Europe; Frey lists it as

common

throughout the wholeof Finland.

IntheUnited Statesitextendsas farsouthasSouth Dakota, Maine, and (inmountains)

New

Mexico. Ithas been reported from Alaska several times.

4 PROCEEDINGS OF

THE NATIONAL MUSEUM.

vol.61.

DOLICHOPUSLONGIMANUSLoew.

Dolichopus longimanus Loew, Neue Beitriige. No, 8. p. 14, 1S61; Smiths.

Misc. Colls.,No.171,p.3S,1S61.

—

VanDuzee, Cole, and Aldrich,BulL 116,U.S.Nat.Miis., p. 195,1921.

Five specimens, Anchorage and Fairbanks, Alaska, June 12 to July2. Described fromEnglish River, Canada, andreported from Alaska by Coquillett in 1900; it occurs in the Canadian zone of Ontario and the eastern partof the United States, and even south to Virginia, but has not been reported from the western United States.

DOLICHOPUSNUDUSLoew.

Dolichopus nudus Loew, Smiths. ISIisc. Colls., No. 171, p. 41. 1S64.

—

Va.x Duzee,Cole,andAldrich,Bull. 116, U. S.Nat. Mus.,p. 201, 1921.

Nineteen specimens, from Hurricane,

Camp

327, and Healy, Alaska,July7 to13. Notdefinitelyrecognizedsinceits description.

The

single type male,from^"Fort Resolution,Hudson's

Bay

Terri- tory," has been entirely destroyed but the wings; hence the

new

materialisvery important.

Loew

mentionsasonecharacter, "

Hind

tibiaestoutbut not exactly thickened,

upon

thefirsthalfof thehind side without hairs," This proves to be a decisivecharacter (inthe male), the bare spot being on whatI wouldcalltheinner side, ex- tendingtothe middle. Loew'sdescriptionis ample,andthespecies is correctly placed inthe analytical table of Bulletin 110,page 15.

DOLICHOPUSNIGRICORNISMeigen.

Dolichopusniyriconiis Meigen, Syst. Beschr., vol,4, p. 82,1824.

—

Becker, NovaActa,vol. 102, p. 148,1920.

Dolichopus disciferStannius, Isis. vol.1, p. 57, 1831.

—

Van Duzee. Cole, and ALDracH,Bull. 116, U.S.Nat, Mus.,p.202,1921.

One

male, one female, Anchorage, Alaska, June 16. Described

from

northern Europe; Frey reports itoccurring all through Fin- land. Reported from Quebec and Ontario, only a few localities south of the Canadian border (Vermont,

New

York, Wisconsin)_; has been previously reportedfromAlaska.

DOLICHOPUSBOREUSVanDuzee,Cole,andAldrich.

Dolichopus horeus Van Duzee, Cole, and Aldrich, Bull. 116. U. S. Nat.

Mus.,p.204, 192L

fDolichopus discimanvs Wahlbeeg, Kongl. Yet. Akad. Forhandl.. vol. 8, p.301.—Zetterstedt,Dipt. Scand.,vol. 12, p.4626, 1855.

Threemales,Anchorage,Alaska,June13and July21, Described from

Ungava

Bay, Labrador. There is littledoubt that horeus is a

synonym

of dischnwius Wahlberg,but I have not seen European

ART.:i5.

XEW

SPECIES OF

THE GENUS

DOLICHOPUS

—

^ALDRICH. 5 material, andthe latter species issaid to have the front coxaedark atbase,whichmightbespecific. Freyincludesdiscimanusunderthe strictly arctic species along with mannerheimi; I have quoted

him

underthatspecies.

DOLICHOPUSAMPHERICUS Melander andBrues.

DolicJiopns ampherlciisMelander andBrues,Biological Bulletin,vol._1,p.

146,1900.—Van Duzee,Cole,andAldrich,Bull. 116, U.S.Nat. Mus.,p.

217, 1921.

Forty-one specimens, Fairbanks, Alaska,June 30to July4.

The

specieshas not been identifiedhithertoexceptinthe typesetoftwo males and three females, collected inPriceCountj^, Wisconsin,

now

intheAmerican

Museum

of Natural History.

My

specimens agree with theseexceptinhavingthe hind tibiaesomewhatinfuscatedon theinnerside attip, andthe front coxaeprovidedwithsomeblack hairsonthe frontside. I

am

indebtedtoDr.

Frank

E, Lutz, curator ofinsects intheAmerican

Museum,

for the privilegeofexamining these types. Thereisoneexcellentmalecharacter,present equally in the typesand

my

specimens,whichatonce distinguished thisspecies fromallthenine related formsmentioned in Bulletin 116 (p. 219)

:

On

thesidesofthefirstabdominalsegmentthe pleuralfoldisrather Avideopenabove,andinthe hollow thusformed isa spot ofminute grayish

tomentum

orerect,short fuzzyhairs,fillingthe hollowand extendinga little dorsadof it. I have compared allthe other nine speciesonthispoint.

DOLICHOPUSMANNERHEIMIZetterstedt.

DoUchopus mannerheimi Zetterstedt, lusi^-ta Lapponica, 1838, p. 707;

Diptera Scandinaviae,1843,vol. _2,p. 500.

—

Becker, NovaActa, vol.102, p.163, 1920.

—

Frey,ActaSocietatisproFauna etFloraFeunica,vol.40, Sep.,pp.4, 27,1915.

Twelve specimens,both sexes,collected at

Camps

327 and334 and atHealy, Alaska,June26toJuly13.

Notheretofore reportedfrom NorthAmerica. Originally described from Lapland. Freyincludesit

among

alistof 20speciesof Dolich- opodidaeofwhich hesays (p.4) ^: "

The

oldestpostglacialDolichopo- didspecies are those ^{* * *} which

now

occuronlyinLaplandand the Kola Peninsula, and here j^rincipally within the purely arctic fieldandtundi-a regions.

The

limitofforestisnotdecisive forthem, asthey

may

occurinthe northern coniferouszone. ^{* * *} Their southern limitis approximately the Arctic Circle." (Translation.)

No

Euroj^ean specimens have been compared, but the characters are striking,andZetterstedt'selegantdescriptionseems unmistakable.

The

speciesishere redescribed forthebenefitofAmerican workers.

In Bulletin 116itruns^tolaticornis in

Group A

onpage9,from which

6 PEOCEEDIXGS OF

THE NATIONAL MUSEUM.

vol. 61.

it isseparableby

many

characters,

among

themtheinfiiscationinthe wingtip.

Male.

—

^{Front green. Face pale yellow, rather narrow. Palpi}

black. Antennae entirelyblack,rather short. Orbitalcilia entirely black.

Mesonotum

andscutellimiratherobscuregreen,withcopperyreflec- tionsandratherdistinctchangeablestripes. Pleurae blackishgreen, butlittleshining. Ciliaofcalypters white. Halteresyellow. Abdo-

men

ratherlong,darkgreen. Hj^popygiumlarge,thelamellae white, rathersquareacross the apical end wheretheyarebroadly bordered with black,deeply notchedandprovided withtheusualcurvedbris- tles;theupperborder^isfringed witherecthairswhichbecomelarger toward the base.

Coxaeblack, the front ones somewhatsilvery onthe anteriorside, with small dark hairs.

Femora

black except the extreme knees;

front tibiae yellow, the middle tibiae yellow but on the outer side distinctly white and without the usual small black ^hairs.

The

tip ofthe middle tibia distinctly infuscated,hind tibia yellow, slightly darkened atbase, withtheapicalfifthblack. Fronttarsi plain, the firstjointyellow exceptatextremetip,theremainderblack; middle tarsuswith thefirstjointbrown,itsapicalfourthwhite,onthe outer sidesnow-whiteandbare,theextremetipandallthe followingjoints deep black; hind tarsi deep black, the first joint as longas all the followingandbearing about 14bristles inseveral erect rows,one of which ison the underside; themiddle femora have a

row

of short whitecilia beginning about themiddle, thehind femorawith a

row

oflong white cilia fromthe middle.

Wings

elongate,rather narrow, with a uniform graytinge and a distinctapicaldarkspot,whichbeginsataboutthe tipofthesecond vein and extends almost to the hind margin, filling out the apex exceptanarrowborderbeginningbehind thetipof the fourth vein

;

hindcrossvein bearinga slight cloud;anal anglesmall,costawith a distinctthickeningat theendofthefirstvein.

Female.

—

Facealittlewiderthan themale;frontcoxae with

many

more blackhairs. Ciliaofcalypters yellow,middle tibiaenotquite so wideas in themale, themiddle basitarsusbrown,its extremetip black.

Wing

broader than inthe male,the apicalspot present,but less distinctly defined; hindcrossvein very distinctly infuscated.

Lengthofmale6.2

mm.

; of female5.8

mm.

The

^onlyspecies

known

in North America which isat all similar to thisoneisaiinulipes Zetter.stedt {stenhammariofauthors),Avhich alsohas blacklegswiththemiddletibiaeandtarsiornamentedwith white. It, however, hasadifferent color patternand is easilysepa- rableby havingblackciliaonthe calypters.

.^RT.iJ5.

NEW

SPECIES OF

THE GENUS

DOLICHOPUS

—

^{ALDPJCH. 7}

DOLICHOPUS LONGICORNISStannius.

Dolichopus longicornisStannius,Isis,vol.1,p.53,1831 (published 1838).

—

Bkcker,NovaActa, vol.102,p. 170,1921.

Not previously reportedfrom NorthAmerica.

Thirty-five specimens of both sexes, taken at Fairbanks, Alaska, from June29 toJuly 3; compared with European specimensin

my

collection, determined by Doctor Kertesz. Originally described from northern Europe; Frey mentions it as widespread but not abundantinFinland. Redescribedfortheconvenience ofAmerican students. Intheanalytical tables of Bulletin 116,the malerunsto couplet 2 of

Group

F,on page 14,where itformsathird alternative

"Antennae black above, yellow below including a large partof the elongatethird joint."

Male.

—

^{Front green.} Face shining yellow, changing to paler below. Palpi yellow. Antennae very

much

elongated, the first joint slender, the third very long with a slender point, the arista attached aboutatthemiddle. Antennaeblack,broadly yellow below including the third joint almost to its middle; the arista slightly thickenedbe^^ond themiddlebut.slender atapex. Orbitalciliawhite except afewabove.

Mesonotum

and scutellum rather bright green. Pleurae green, overlaidwithsome graydust. Calypterswith whitecilia. Halteres yellow.

Abdomen

subshining,green.

Hypopygium

black,green nt base, the lamellae white, oval, with a sharply defined black border above, becoming wider apically, the hairs along the upper border longer and more erectthan usual; the apexhas the usual incisions andcrookedbristles.

Front coxae yellow with pale hairson the anterior side; middle coxae black exceptattip,hindcoxae yellow withablack spoton the outer side, extending

down

to the bristle.

Femora

and tibiae yellow, thehind tibiaeinfuscated atthe tip where they are slightly swollen and haveonthehind side,justbefore the apex,a very dis- tinct rounded depression; the color of the front and middle tibiae is

more

white than usual; femora not ciliated.

The

middle tarsi plain,

brown

fromthe tip of thefirstjoint; hindtarsientirelyblack with only aboutthreebristles.

Wings

with a grayish tinge, rather broad, with the anal angle littledeveloped;averypronouncedthickeningof the costa at the tip of thefirstvein.

Female.

—

Face broader and grayish yellow. Antennae shorter thaninthemale,stillnoticeably elongated,withavery sharp point

;

theyellow color on the underside reaches almostto the tip and is

very distincton thethird joint.

The

cilia of the calypters

may

be in part black.

Hind

tibiaescarcely at all infuscated, especially on the outer side.

Lengthofmale3.1

mm.

;offemale3.8

mm.

8 PROCEEDINGS OF

THE

NATION^AL

MUSEUM.

vol. Gl.

DOLICHOPUSFORTIS,newspecies.

Male.

—

^Front bronze green. Face brownish 3^ellow, glistening.

Palpi black. Antennae entirely black, of ordinary size. Orbital cilia entirely black.

Mesonotum

and scutelliimdarkbronze green, alittle dusted, cop- pery along the suture. Pleurae blackish-green, moderately dusted.

Cilia of the calypters black. Halteres yellow. x\bdomen rather elongated, blackish-green with bronze reflections.

Hypopygium

black, of moderate size, the lamellae whitish, oval, with a broad black margin apically and below, the usual incisions and crooked bristles at the apex.

Legs black, the knees vei-y narrowly yellow; all the tarsi plain, the front ones about one-fourth longer than their tibiae; hind fe-

mora

with longciliabelow, mostofwhich appearpale infavorable lights.

Wings

decidedly infuscated throughout, the hind cross-vein and thecurvature ofthefourth veinslightly

more

so; costa witha short enlargement atthe tip of the first vein; outline of the

wing

of the ordinary form.

Length 5.4

mm.

Described from one male taken by the writer at Healy, Alaska, June 23, 1921.

r?/;?e.—Male, Cat. No. 25188,U.S.N.M.

Runs

to paluster on page 10 in the analytical table of Bulletin 116; butisa

more

elongatedspecies,

much

less greenin color, with long insteadofrounded wings.

DOLICHOPUSPENSUS, newspecies.

Male.

—

^Frontgreen, notvery shining. Face silvery, of moderate width andrather long. Palpi yellow. Antennaeblack; very

much

elongated, especially thethird joint, which has along slender point extending

much

beyondthe insertionofthe arista; the firstjoint is distinctlyyellow below at the apex. Orbital cilia white except the upperones.

The

headisnotsowideinproportiontoitsheightas in most species.

Mesonotum

and scutellum green, not very bright. Pleurae dull green. Calypters with white cilia. Halteres yellow.

Abdomen

rather bright green with the usual thin pruinosity on the sides.

Hypopygium

rather large, the lamellae white with the usual black borderandwitlitheapexnotchedandbristly.

Front coxae yellow; middle and hind coxae black except tips.

Front femora yellow with rather distinct but poorly defined dark shadingalongthe middle;middle femorayellowstill with faintin- dications of infuscation: the hind femora vellow on the basal half.

AUT. 25. XEV\^ SPECIES OF

THE GENUS

DOLICHOPUS ALDBICH. ₉ graduallybecomingblack at theapex; the extremetip, however, is yellow. Front and middletibiaepale yellow; thehindtibiaeblack witha

brown

streakonthe posteriorexceptneartip;they areconsid- erably longer than their femora andtheir tarsi are strikingly elon- gatedand enlarged,anddeep blackin color; thesecondjoint of tha hind tarsus seems especially enlarged and noticeably flattened; the following jointsofsimilarappearance but decreasingin size; front and middletarsiplain,infuscatedfromthetipofthefirst joint.

Wings

hyaline with aperceptible

brown

tingeonthe anteriorhalf exceptatbase;costanot thickened;anal angle very

much

reduced.

/^emaZe.— Facealittlewiderthaninthemale, rathergrayin color.

Antennae longer than usual in the female, the third joint with an

uncommonly

sharptipbut very

much

shorterthaninthemale. Cilia ofthe calypterssometimes inpartblack.

Femora

colored as inthe male; thehind tibiae,however, yellow except onthe apicalfourth

;

theyarelongerthan thefemoraas inthemale andthehindtarsiare considerably elongatedand entirelyblack but thejoints are not en- larged orflattened.

The wing

hasa distinctbrownishtingewhich is

not confined to the anterior half.

Length 3.1

mm.

Described from 12 males and 13 females _{collected at} Fairbanks, Alaska,on June30, 1921,bythe writer.

Type.—

Male, Cat. No. 25189, U.S.N.M.

The

striking enlargement and black coloration of the hind legs suggested thename,theideabeing thanthesecharactersareprobably displayed while hoveringintheair,thelegshanging down.

Inthe tablesof Bulletin 116Iwouldputthis in

Group

F,_{in spite} ofsomeinfuscation ofthefrontfemora;itwouldthenruntoacutus, page15,butthe latterhasnoinfuscation ofanyof the femora,etc.

DOLICHOPUSSIMPLICIPES. newspecies.

Male.—

Front rather dull green. Face narrow, silvery, with a slight yellowish _tinge. Palpi yellow. Antennae black,*^the first jointfaintlyyellowishbelow ontheinnerside,the thirdjointrather broad, but notelongated. Orbitalciliawhite except afewabove.

Mesonotum

andscutellum bronze-green, not veryshining. Pleurae greenish-black,with arather thickgraydust. Calypterswithblack

cilia. Halteres yellow.

Abdomen

shining green, not very bright, a thin whitish pruinosity along the sides.

Hypopygium

black, of moderatesize,the lamellaeoval,white, withanarrow marginabove and a broader one at apex, where there are the usual notches and curvedbristles.

Front coxae yellow,with a small indistinct dark spot atbase on theouterside;thefrontsidewith pale hairs;middle and hindcoxae black except at tip.

Femora

yellow; the hind ones slightly infus-

10 PROCEEDINGS OF

THE NATIONAL MUSEUM.

vol.61.

cntedattip,notciliated,butwith unusually long blackhairsonouter lower partbeyondmidde, witha singlelong preapicalbristle. Front and middletibiaeyellow, thehindones infuscatedonabout theapical fourth but not

much

enlarged; front tibia at apex below with a long slenderbristletwo-thirdsaslongas the basitarsus. Allthetarsi plain, thefront and middle ones infuscatedfrom the tip of the first joint; hind onesentirely black.

AVingshyaline,rathernarrow,theangle

much

reduced;the fourth veinwith onlya slightbend,ending

much

beforetheapexof thewing.

Costa with a large and long thickening at the junction of the first vein.

Female.

—

Face considerablywider than in themale, almost white.

Frontcoaxaewith blackhairsontheanteriorsurface.

Hind

femora withfaintinfuscationcovering aboutthe apical fourth.

Length3.2

mm.

Describedfrom3malesand2 females. Allcollectedbythewriter at

Camp

327,Alaska,July12,1921.

Type.—M2lQ,Cat.No. 25190,U.S.N.M.

ySimpUcipes runsinthe tablesof Bulletin 116 tocouplet 10,page

17. Itdiffersfromdiscolor in havingthe costathickened, andfrom genuaJAsinnothavingthe lamellaproducedin asharp pointatapex.

DOLICHOPUSCRASSICORNIS, newspecies.

Male.

—

^{Front bright green. Face light} golden yellow, rather narrow below\ Palpi yellow. Antennae wholly black, quite large, thethirdjoint considerabl}' elongated, about twice as long as wide;

the arista inserted near the tip. Orbital cilia pale yellow except a fewabove.

Mesonotum

bright greenwitha

brown mark

eachside. Scutellum green. Pleurae green, subshining. Cilia of the calypters black.

Halteres yellow.

Abdomen

^bright green, at incisures narrowly blackish.

Hypopygium

black. Lamellae white, oval or somewhat rectangular, with a black border above which is wider apically, wherethere are theusualincisionsandcurvedbristles.

Coxae black, the front ones slightly yellow toward _{the apex, es-} peciallyon thefrontside.

Femora

yellow,front onesfaintlytinged with

brown

below, the hind ones without cilia, and with a slight but distinct infuscation at the tip above. Tibiae yellow, the hind ones deep black on the apical third or more, slightly enlarged apically and bearingon the hind side just before the apex a very striking, rounded depression; the flexor side of the hind tibiae closely beset with small black suberect hairs.

Hind

tarsi entirely black; frontand middletarsi plain,black fromtipof the firstjoint.

The

front tibia has at apex a finecurved hair-like bristle which is

quite short, less than halfthe length of the basitarsus.

ART. 25.

XEW

SPECIES OF

THE GENUS

DOLICHOPUS .\LDEICH. 11

Wings

hyaline,of ordinary shape;the anal angle notvery promi- nent.

The

costa with a long tapering enlargement from the junc- tionofthefirstvein.

Female.

—

Face yellow, twice as wide as the male, dull white in color. Third antennal jointof ordinary form.

The

front femora with quite distinct traces of

brown

above and below; the middle femora with faint

brown

tinge below; hind femora with the tip deeply infuscated. Costa not enlarged. Otherwise as in male.

Length3

mm.

Described from 6 males and 1 female, all from Healy, Alaska, except 2 males which are from

Camp

327, Alaska. Collected by the writer.

Type.—M2lQ, Cat. No. 25191, U.S.N.M., from Healy, Alaska.

Runs

to sincerus in the table of Bulletin _116, page 17, but has

much

longer antennaeand a strong thickening ofthe costa.

DOLICHOPUSINFLATUS, newspecies.

Male.

—

Front green, iace light golden yellow. Palpi yellow.

Antennae of ordinary size,the first joint whollyyellow, the others black. Orbitalciliawhite except a fewabove.

Mesonotum

andscutellum bluish green,moderately bright with a copperystripe atthesuture. Pleuraegreen,moderately dusted with gray. Cilia of the calypters black,rather abundant. Halteresyel- low.

Abdomen

bright green, rather coppery on the posterior part ofeachsegment, almost whollyshining. Plypopygiumrathersmall, black,the lamellaeoval,white,with a narrowblack margin, thetip incisedandfurnishedwith the usual longbristles.

Wings

slightlybrownish,moreso towardthecosta, rathernarrow in shape, the hind border distinctly emarginate between the fifth

andsixthvein;anal angleprominent;costawith an elongatedswell- ingatthe junctionof thefirstvein.

Legsyellow, themiddle and hind coxae black except ^{at tip;} hind femora not ciliated; all the tarsi plain, pale at base; the middle tibiaewith a smooth, whiteinflatedportion onthe outerside of the

•apical fourth.

The

front coxaehaverather conspicuous blackhairs onthe anteriorside.

Length4.8

mm.

Described from one male taken at Anchorage, Alaska, July 20, 1921,bythe writer.

T^yy^e.—Male,Cat.No. 25192,U.S.N.M.

The

structure ofthe middletibiaisabout thesameas infulvipes., butthe latterhastheantennae elongatedandalmostentirelyyellow, with several other differences.

The

species runs to fulvipes in the table inBulletin 116,page26.

12 PROCEEDINGS OF

THE NATIONAL MUSEUM.

^{vol. 61.}

DOLICHOPUS DELICATUS, newspecies.

MaU. —

Front bright green. Face rather wide, grayish yellow.

Palpi dark yellow and quite prominent. Antennae slightly elon- gated, black, thefirstjointbroadlyyellow,thethirdsharplypointed, but not remarkablyelongated. Orbital cilia yellowish white except a fewabove.

Mesonotum

andscutellumcoppery greenin color. Pleurae black- ish green, dusted with gray. Calypterswith black cilia.

Abdomen

bright green with coppery reflections.

Hypopygium

rather small and rounded, black; the lamellae rather deep yellow, small, oval, withbrownishborderandatthe apexsomeincisionsand moderately long bristles.

Legsyellow, themiddle and hindcoxae black,thefront coxae in- fuscated on the outerside near the base; hind femora not ciliated,

hindtibiaeslightly infuscatedatapexandtarsiwhollyblack. Front tarsi with the firstfourjoints yellow, the second,third, and fourth ofalmost equallength,thefifthjoint black,veryslightlycompressed, aboutthree-fourths aslongas thefourth joint; middle tarsi infus- cated fromthe tip ofthefirstjoint.

Wings

rather brownish, of about normal shape,the costa hardly thickenedatthejunction ofthefirstvein.

Female.

—

^{Front stillwider than in themale,} quite gray, the an- tennaea littleshorter.

The

anterior tarsi areratherdarkyellow to the last joint which is black but notat all compressed.

The

third andfourthjoints are eachalittleshorterthanthefifth.

Length5

mm.

Described from 4malesand 3 femalestaken at L^^ngava

Bay

and FortChino, Labrador,collected byL.M.Turner.

T'y^e.—Male,Cat.No.25193, U.S.N.M.,from

Ungava

Bay.

Delicatus runs to horeus, page 22, in the table of Bulletin 116, and greatly resembles that species; themale fore tarsi are on the sameplan yetquitedistinct.

The

fourthjoint inhoreusisvery thin andelongated,andthe fifthis about one-thirdas long but verydis- tinctly compressed though small. In delicatus the fourth joint is lesselongate andthin; thefifth isone-half as long, and so slightly compressed that it might almost be called plain.

The

lamellae in delicatus are smaller and

more

rounded than in boreus, and the costaisnot thickened.

DOLICHOPUS ELEGANS.^newspecies.

Male.

—

^{Front green. Face pale yellow, rather narrow below.}

Palpi dark brown. Antennae of the ordinary size, entirely black.

Orbitalciliawhite exceptafewoftheupperones.

Mesonotum

and scutellum rather shining green. Pleurae green with a little gray dust. Cilia of the calypters black. Halteres

ABT. 25.

XEW

SPECIES OF

THE GENUS

DOLICHOPUS ALDEICH. 13 yellow.

Abdomen

green with bronze reflections and slight prui- nosity.

Hypopygium

large, black, thelamellae oval, whitish, with blackborderwhichisratherwideaboveaswell as apically, theapex hasafew smallincisions andlongerbristles.

Legs yellow, middle and hind coxae black, front coxae blackish atbaseforabout one-thirdthelengthand on theouter sidefortwo- thirds; hind femora notciliated, decidedly infuscated at tip; hind tibiaeblack on the apical fifth and theirtarsi entirely black; front and middle tarsiinfuscated fromthetip of the firstjoint,the front onesabout one-third longerthantheirtibiae,thelasttwojointsdis- tinctly flattened but w^ithout lateral fringes of any size;

when

viewed fromabove thesecond and third jointsappear very narrow emphasizing the breadth of the last two.

They

arc all of a grad- uallydecreasinglength.

Wings

slightly infuscated or sul)hyaline, of ordinary shape; the costa wnth a rather shortenlargement atthe tipofthe first vein.

Female.

—

Face dull gray, wider than in the male; front coxae almost entirely black; hind femora rathermore broadly infuscated attip.

Wings

distinctlywider thaninthe male.

Length 3.8

mm.

Described from 4 males and 1 female taken by the writer at Tennessee Pass, Colorado, altitude 10,240 feet (3.12 kilometers).

July 10. 1019.

ry/?^.—Male.Cat. No. 25194,U.S.N.M.

DOLICHOPUS LONGUS.newspecies.

i1/rt/<?.—Agrees very closely with fortify except in tlic following characters: Face dull brown instead of shining brownish-yellow;

fore and middle femora with longhairs below on lower hind edge, subciliate: ciliaof hind femora wholly black; hindtibiaemorethick- ened; lamellaealmostwhollyblackish,onlyonthe central andbasal part a trifle lighter in color. Size and elongate form the same in both, and theelongate brownish wingsare thesame.

Four males,Tennessee Pass, Colorado. July 10 and 11, 1919. col- lected by the writer.

7yp^._Male. Cat. No. 25195. U.S.N.M.

DOLICHOPUS RECTiroSTA. newspecies.

Male.

—

Frontdeep blue, at the sides verynarrowly Avhitish.

The

face narrow, silvery white. Palpi black. Antennae short, entirely black. Orbitalcilia Avhiteexcepta fewofthe upperones.

Mesonotum

deep bluewith greenish reflectionsand insome lights a Avliitish pollinose triangle on each side of the suture. Scutellum deep blue. Pleurae bluish green, very thinly dusted. Cilia of the ralypters black. Halteres light yellow.

Abdomen

greenish blue, the incisures narrowly blackish, at sides of thesegments with thin silvery pruinosity.

Hypopygium

rather small, black; the lamellae

20107—

22—

Proc. N.M.vol.61 44

14 PROCEEDINGS OF

THE

XATIOXAL,

MUSEUM,

vol.61.

oval, white, with a narrow dark margin apically, almost none else- where.

At

the apex there arefive or six long bristles arising from prolongations of the lamellae.

Coxae and femorablack, hind femora notciliated; the knees and tibiae lightyellow; hind tibiaeinfuscated forabout one-third their length. Front and middletarsi plain, lightyellow at base.

Wings

hyaline, costa not thickened; shape of the

wing

is very peculiar, the costal marginbeing

much

straighter than usual about tothe point where the third longitudinal vein joins it.

From

this pointitcurvesbackward and theposteriormargin has abroad uni- form curve,the anal angle being very little developed.

The

fourth vein beyondthe cross veinbends stronglyforward and continues in that direction to the margin so that its tip is considerably before theapexofthewing. Itishoweverparallel withthethird vein.

Length 3.6 nmi.

Described from a single male specimen from Florida, labeled

"Fla."

Type.—

Male,Cat. No. 25196, U.S.X.M.

Runs

to couplet 30, page 14, in the table of Bulletin 116, but differsfrom all three species inhaving the costa almoststraight.

DOLICHOPUS ABRUPTUS,newspeciea.

Ma2e.

—

Front steel blue; face pale golden yellow, rather narrow below_; palpi yellow;antennaewhollyblack,ofmoderatelength;the arista plain; orbital cilia white except on the upper third. Meso-

notum

and scutellum darksteel blue; pleurae green with thingray dust; calypters with black cilia.

Abdomen

green; the incisures black;

Hypopygium

black, rather small; the lamellae ending in a very sharppoint,the narrowblackborderentireandnot veryhairy.

Legs yellow; the front coxae considerably infuscated on the basal third;middleand hindcoxae black except^tips; thehind femora and tibiaeinfuscatedonthe apical fourth. Fronttarsioneandone-fourth times aslong as their tibiae; the basal joint about as long as the four following, yellow; second joint about one-half as long, also yellow; the remaining joints black, the third becoming flattened toward the apex, the fourth and fifth distinctly flattened laterally but notfringed. Middle femora havingaveryslighttinge of

brown

at theapex; middletibiaeratherwhitish, theirtarsiinfuscated from the tip of the first joint; hind ^tarsi entirely black; pulvilli small.

Wing

subhyaline, rather broad on the apical half; the anal angle howeverconspicuously narrowed; costanot thickened at tip offirst vein.

Length3.9

mm.

One

male,

Lake

Tear, Essex County,

New

York. Collector un- known. Receivedfrom

M.

C.

Van

Duzee.

AET.2D. >:EV.' species of

IHE genus

DOLICHOPUS ALDRICn. 15 rt/;;^.—Male,Cat. No.25410,U.S.N.M.

Runs

to virga on page 17of the analytical table of Bulletin IIG, butdiflPersinthemaleinhavingthe frontsteelblue,the anal angle of the wing conspicuously reduced insize and thethird and fourth jointsof the fronttarsinot broadlyfi-inged so as tohavetheappear- anceof atassel.

DOLICHOPUS TOWNSEXDI,newspecies.

Male.

—

Front green, face pale yellow, quite narrow below; palpi yellow;antennaeofmoderatesize,thefirsttwojointsentirelyyellow, third entirely black, not at all elongated; orbital cilia pale, about sixofthe upperones black;thorax and

abdomen

bronzegreen with a considerable whitish dust, which in certain lights partly obscures thegroundcolor. Pleurae ofthesamecolorbutalittlemoredusted

;

calyptcrswith blackcilia.

Hypopygium

long andstoutwith excep- tionally large lamellae,whicharewidestnear theapex, rathertrun- cate, white except anarrow apical andstill narrower upperborder

;

the apical margin begins below with long processes bearing cilia, tliesebecomegradually shorterattheuppercorner andbeararather 'iniformrowofcilia. T^egsyellow;allthetarsiblackened fromthe tip ofthefirst joint,the secondjoint, however,more orless pale at base; fore tarsi plain,not

much

longerthan the tibiae; front coxae withoutdarkhairsexceptnearthe tip;middleand hindcoxae

brown

as far as the bristle; hind femora without cilia, middle and hind with only one preapicalbristle,hindtibiaenotatallenlarged,onthe hindside freefromhairsbetweenthetwo rowsof bristles wherethey seemtobe whiteron account oftheabsenceof hairs. "Wings almost hyaline, widest a little beyond the large crossvein, at which point the costa begins to bend backward: fourth vein ending rather far before the apex, almost parallelwith the third; a distinct notch in thehind marginat the tip of thefifth vein; anal angle small; costa not thickenedatthejunction of the firstvein.

Length ofmale, 5.4

mm.

Described from 1 male, on rocksby stream, Rio Ruidoso. "White Mountains.

Xew

Mexico, about6.500 feet altitude (1.98 kilometers), July30,collectedby C.H.T.Townsend.

ry7?e.—Male. Cat. No. 25237,U.S.N.M.

Runs

to terminalis incouplet 58on page 26,but differsinthevery largewidelamellae, inhavingthe fronttarsidarkened fromthefirst joint instead of only the last joint, and in some otherminor char- acters.

DOLICHOPUS EXSUL, new species.

Male.

—

Front green, face silvery white, rather narrow below.

Palpi yellow. Orbital cilia white except a few of the upper ones.

Antennae slioii:. broadly reddish below including the third joint.

16 PROCEEDINGS OF

THE NATIONAL MUSEUM.

^vnr.81.

The

firstjointnarrowlyblackishontheupperedge, the third mostly brown.

Mesonotum

shininggreenwithacopperystripeoneachsidealong the suture. Scutellum shininggreen. Pleurae blackish green, cov- ered witha thingray dust. Ciliaof the calypters black. Halteres yellow.

Abdomen

^{shining green,} but less bright than the thorax.

I'osteriorly it is compressed.

Hypopygium

large, blackish green.

Lamellae nearly circular, white with a very narrow dark border.

The

frontedge deeplyincisedfromhalfa dozenlong processeswith bristles at thetip.

Legs yellow.

The

middle and hind coxae blackish except at tip.

The

hind tibiae blackened from about the middle to end. Tarsi entirely black. Frontand middletarsigradually infuscated toward theapex. Frontcoxaewithblackhairson theanteriorsurface.

Wings

hyaline, rather narrow in shape, the anal angle not very prominent.

The

fourth longitudinal vein sharply bent beyond the crossveinwithastumpofaveinatoneorboth ofthe bends. Costa with anelongated swelling not verylarge at thejunction of thefirst vein.

Female.

—

^{Face about halfwiderthaninthemale.}

^Hind

^tibiaein-

fuscatedonthe apicalfourth,otherwise aboutas in themale.

Length4

mm.

Described from G males and 5 females collected at Tantalus and Waialua, Oahu, andatOlaa,Hawaii,2,500 feet (0.76kilometer),all intheHawaiianIslands,by

W.

H.Ashmead.

Type.—M^\Q,Cat.No. 25197, U.S.N.M.,fromTantalus.

Thisisthe onlytrue

DoUchopus known

to

me

tooccurin a tropi- cal climate.

The

speciesisnot

known

from North America;itwould runtoabrasusonpage20inthe tablesofBulletin 116,butisreadily separablebyitsshort,broadlamellae. It

may

have been introduced from Japan, but tlie species of that region are too imperfectly knoAvnasyettosettlethat point.

Genus

HYDROPHORUS

Fallen.

Jlydroplionis Fallen, Diptera Sueciae, Dolichopotles, 1823, p. 2.

—

Loew, Smiths. Misc. Colls., No. 171, 1864, p. 211.—Aijjkich, Psyche, vol. 18, pp. 45-73, 1^pi.,1911.

Sixspecies of thisgenus werecollected inAlaskain

my

^expedition

of June and July, 1921^; one wasundescribed, none European, and

allbuttwooccurintheUnitedStates.

HYDROPHORUSALTIVAGUSAldrich.

HydrophorusoliivutjVHAldrich, Psyche,^vol.18,p.67.1911.

Ten

specimens,Anchorage andFairbanks, Alaska. Describedfrom Colorado,andIafterwardscollecteditatMoscow,Idaho.

ABT.i!5.

NEW

SPECIES OF

THE GENUS

DOLICHOPUS ALDRICH. 17 HYDROPHORUSBREVISETAThonnon.

Medeterus breiHsetaThomson,Fregat.Eugenies Resa,1868,p.150.

Hyclrophorus 'brcinsetaAldrich, Psyche,vol. 18, p. 58,^tigs..1911.

Four

specimens,

Seward

and Skagway, Alaska. Described from California,presumably

San

Francisco;sincereportedfromthePuget

Sound

region.

HYDROPHORUSINNOTATUSLoew.

Hydrophorusinnotutus Lokw, Smiths.Misc. Colls.,No.171,p. 212, 1864.

—

Aldbich, Psyche, vol. 18, p. 66, 1911.—Malioch, Rept. Caiuid. Arctic Exped.,vol._3,p.50c,1920.

Eight specimens, Skagway, Alaska, June 4, and Seward, Alaska, July 24. Originally described from Sitka, and since reported from Arctic Canada, Oregon, and Washington

HYDROPHORUSGRATIOSUSAldrich.

Hydrophorusyratiosas Ar.uiucii, Psyche,vol. 18,p. 40; Entom. News, vol.

24,pp. 215, 217, 219.

Two

specimens, Anchorage,Alaska, July21,and Seward, Alaska, July 24. Described from Idaho, Washington, and California, and sincereported from

Utah

and Nevada.

HYDROPHORUSSIGNIFERUSCoquillett.

Hydrophorussiynifenia C'oquillktt,FurSealsandFurSeal Islands,vol.4, p.344,1899.—Malloch,Rept.Canad.Arctic Exped..vol.8,p.50c.

One

female, Healy, Alaska, June 26. Described from Bering Island, and reported with additional description by Malloch from Teller.Alaska.

The

National

Museum

has eiglitspecimenscollected by J. M. Jessupin 1912on the x\laska-yukon boundary at latitude 69^ 20'.

HYDROPHORUSAQUATILIS, newspecies.

Female.

—

^Front with gray pollen, along the orbitsthinner so as toshow a littleof the greencolor beneath; face entirely gray poUi- nose: cheek below the eye rounded and narrow; beard yellowish;

antennae black, of ordinary size; occiput with a single pair of bristles.

Mesonotum

yellowish gray pollinose, with brownish re- flections which are brighter above the wings; pleurae of the same color: propleura with yellow hairs andone yellow^bristle; calypters with yellowish cilia. Halteres decidedly black, thestem yellow ex- cept at base.

Abdomen

^greenish,coppery, with a thin gray pollen.

Legsblack, the femorawith greenish reflections;front coxae covered with yellowish pollen, with rather long yellow hair ⁱⁿ front and withoutanyblackbristlesevenatthetip. Frontfemoramoderately thickened atbase,witha rowofsevenoreightspineshardly reach-

intr the middle, and some scattered

much

shorter spines extending

18 PROCEEDINGS OF

THE NATIONAL MUSEUM.

^voi,.61.

along the inner side of this row and somewhat beyond.

The

front tibia almost straight, on the extensor side with a rowof short even bristles; on the flexor side a denserrow of

more

erect and shorter little spines,terminatingin onewhichisalittlelonger;middle and hind femora very slender.

Wings

long and narrow, uniformly tingedwithbrown,withoutanydistinct spots.

Length,3.8

mm.

Two

females,Fairbanks and Nenana,^Alaska.

Type.—Y2mi\\Q, Cat. No.25409, U.S.N.M.,from Fairbanks.