60 DTPTERA OF NORTH AMERICA. [PART IV

sufficient importance to justify ageneric separation of tliose few species Avhich possess tliem, the genus

Gloehina

will

have

to

be abandoned. By

all

means Gloehina

cannot be maintained as a

name

of the

group now

called

Dicranomyia.

This

name,

as

shown

above, has

been proposed

a year earlier,

and

was, from the

beginning

connected with a seriesofthose veryspecies

which

constitute it

now.

Tablefor thedetermination ofthespecies.

/^

Wings

remarkablynarrow, lanceolate(Tab. I,fig. 1).

1^

¹ longipennis5c//i/r/?.

'Wings oftheusual shape. 2

rTipof the auxiliary vein nearly opposite, or before,or onlya short c ^\ distance beyondthe origin ofthesecondlongitudinal vein. 3

I Tipof the auxiliaryvein a considerable distance beyond the origin

L of thesecond longitudinal vein. IG

q ⁽The wholeantennrc, or atleasttheirbasaljoints,pale. 4

(The whole antennaeblackorbrown. 7

. (Discalcellopen. 5

(Discalcellclosed. fi

f. (Thoraxwitha singlebrownstripeinthemiddle. 2

immodesta

^0.S.

(Thoraxwiththreebrownstripes. 3 gladiator 0.S.

P⁽Flagellumof theantennaeandhalteresinfuscated. 4diversa0.S.

iFlagellumandhalteresnot infuscated. * 5

pudica

0. S.

'Discal cell (in normal specimens) open; tip of the auxiliary vein considerablyanterior to the originof the second vein; theprse- furcaisabout equalinlengthto the distance betweenthe origin of the thirdveinandthesmallcross-vein, orevenshorter. 8 Discalcellclosed; tipof theauxiliaryveinnearlyoppositetheorigin of the second vein (or,

when

anterior or posterior,the distance small);praefurca distinctlylongerthanthe distancebetweenthe originof the third veinandthesmall cross-vein. TO o fRostrum andproboscisnearlyas long as thehead. Grostrifera,n. sp.

(Rostrum andproboscis

much

shorterthanthehead.

q^fThoraxochraceous. 7brevivena, n. sp.

IThoraxbrown. ⁸ floridana,n. sp.

/Thoraxshiningblack, pleuraewitha silveryreflection.

10^ ¹⁵

morioides

^0. S.

'Thoraxbrownish or grayish. 11

^, fFemorawitha ratherbroad palebandatthetip. 14badia ^TT'oM-.

(Femorawithoutsucha band. 12

/-Thedistance between the tip ofthe auxiliaryveinandthe subcostal

,£,j cross-veinisnearlyaslongas thestigma. 13

I Thedistancebetweenthetip ofthe airxiliary vein andthesubcostal

'- cross-veinisshorterthanhalf thelengthof the stigma. 14

7-^

DICRANOMYIA.

^{^^}

,. (Haltevesunusually long. 13halterata, n sp

^'

\Halteres of the ordinarylength. 9

<3^f

tans S.

fThe cross-vein separating the discal cellfromthe ^first basalcell>s

arcuatedinsuch a manner,that theinnerendof the discal cell is but ^little more distant from the basis^of the wing than the innerendofthe subraarginal^{cell. 10}stulta 0. S.

^^^ The cross-vein separating the discal ^cellfrom ^{the firstbasalcellis} not conspicuously arcuatedandhence,theinnerendofthe discal cell^isdistinctlymoredistantfromthe basis^ofthewingthanthe

i^ innerendofthe submarginal^cell. _^

rThoraxgray,with^abrownstripe in themiddle. 11liberta 0. S.

15\Thoraxbrownish-yellow, withabrown^stripein themiddle.

i 12 haeretica,^{n. sp.}

(

Wings

immaculate.

IWings^spottedwith brown.

..(Stigma^{distinct. IG}pubipennis 0. 5.

^'

1

No

vestige of a stigma.

"

globithorax, ^{n. sp.}

rWingsbrownish,three or fourbrownspotsalongthe anteriormargin,

j^^{^} ISrara, ^{n. sp.}

\ Wingswithbrowndots inallthecells. 19 defuncta0. S.

Description ofthe species.

1.

D. loiigipennis

^ScnoM.

^%

^{and 9}.-Ochracea, thoracerufescente, vittis tribus obscurioribus; pleuris vitta fusca^{; alis}angustis,immacu-

latis,areola discoidaliaperta;costa,venaquelongitudinaliprimapallide fiavis; venaauxiliarisponeinitium^{pra^furcse}perparum^extensa.

Ochraceous, thorax reddish above,withthree darkerstripes,pleuroewith abrown^stripe; wings narrow,immaculate; discalcellopen; the costa and the first longitudinal veins paleyellow; theauxiliaryveinisex- tended very ^little beyond the origin of the ^prffifurca (Tab. I, fig. 1).

Long.corp.0.25—0.3.

Syn. LimnobialongipennisSchdm. Beit. etc. 104,^2.

Dicranomyiaimrnemor 0.Sacken,Proc. Ac. Nat.^Sc.Phil. ISGl, p. 287.

Head

^{brownish, ratlier elongated, rostrum}

^brown,

^{also some-}

what prolonged

; palpi

and

antennae

brownish

; second ^{joint of} thelatter stout^; thorax reddish-yellow above, with three ^indis- tinct

brownish

stripes, the intermediate one

with

a^faint yellow line in the middle. Pleurai with a

brown

line, bordered with whitish,

running from

the

humeri towards

the basis of the halteres; the latter

have

a whitish stem

and

a

brownish knob

;

abdomen ^brownish

^{; feet pale yellow, tip of the tibiifi}

^and

^tarsi

infuscated;

wings

narrow, lanceolate, their basal,

narrowed

portion rather long, their color ^is subhyaline; anal angle small.

62

DirTERA

OF

NORTH AMERICA. [PART

IV.

hardly projecting; stigma elongated, pale; costa

and

firstlongi- tudinal veins pale j^ellovv, the other veins

brown

; tip of tbe auxiliary vein verylittle

beyond

the origin of theprsefurca; sub- costal cross-veinimmediately opposite this origin; tip of the first

longitudinal vein a little anterior to the middle of the sub- marginal cell; the latter rather long, longer than thefirstpos- terior cell; the discal cell being open, the first

and

second posterior cells are of equal length; the third is one-half the length of the second; seventh longitudinal vein

somewhat

bisinuated.

Hob. Trenton

Falls,

X.

Y.,

where

I

caught numerous

speci-

mens on

a

meadow.

In general habitus this species is different

from

the other

Dicranomyiae

; its very

narrow wings

with their yellow costal

and

first longitudinal veins,

forming

a contrast with the

brown

color of the otherveins,

make

^{it easily} recognizable.

The

struc- ture of its

male

forceps belongs to the

same

type with those of the other species ofthegroup. I

had

at firstdescribed

D.

longi-

pennis under

the

name

ofZ).

imme.mor,

but recognized afterwards

itsidentity with a species belongingto easteru

Europe.

2.

D. immodesta

^0.S.

%

^{and 9-}

—

^Ochracea,thoracis vitta fuscA;

antennis fuscis, basi pallidis; alls lijaliuib, stigmate pallido, areola discoidali aperta; venae auxiliaris apexinitio pr.iefurcae plus minusve oppositus; venula subcostalis transversa ab auxiliaris apice stigmatis longitudineremota.

Ochraceoiis,thoraxwithabrownstripe;antennae brown,paleatthe base;

wingshyaline, stigmapale; discal cell open; the tip ofthe auxiliary veinisnearlyoppositethe origin of the praefurca; the subcostal cross- vein isata distancefrom the tipofthe auxiliary vein, whichisabout equaltothelength of the stigma. Long. corp. U.25

—

^0.3.

Syn. Dicranomjjiaimmodesta0.Sacken,Proc. Ac.Nat.Sc.Phil. 1859,p.211.

Rostrum

pale, palpi infuscated; antennae fuscous,pale at base

;

verticils rather long; front

and

vertex infuscated.

Thorax

ochraceous, paler

on

the pleurae; adark

brown

stripe, extending overthe collare, in the

middle

; this stripeis abbreviatedbehind

and

does not reachthe transverse suture; the lateral stripes arc notperceptible_; both ends of the scutellum

and

a stripe in tlie

middle

of the

metathorax

usually infuscated.

Knob

of the halteres

dusky

; feet pale tawny, coxa^

and

basis of the

femora

DICRANOMYIA,

₆₃ pale yellow; tips of the tarsi darker.

Abdomen

infuscated above; forceps pale.

Wings

nearly hyaline;

stigma

elliptical, pale; veins pale

brownish

; tip of the auxiliary vein nearly opposite or a little before the origin of the praifurca; the sub- costal cross-vein is separated from the tip of the auxiliary vein

by

a distance at least equal to the length of the stigma,if not longer; the cross-vein, formingthe inner

end

ofthe discal cell, is sti'aight; discal cell always open.

Hab. Washington

;

Trenton

Falls;

Maine.

When

I firstdescribedthis species I

had

twenty-fivespecimens for comparison. I),

immodesta

is not unlike the

European D.

viodesta, the discalcell of which, however, is closed.

3. I>.

gladiator

0. S. % and 9-

—

Ochracea, fnscescens; thoracis vittistiibus fuscis; aiiteiinisfascis,basi pallidis, alis liyalinis,stigmate iiifuscato; areolS, discoidali apert^; vent's auxiliaris apex initio prre- furcsei')hisniinusve oppositus; veuiila subcostalistransversaab^auxili- arisapicestigmatislougitudine remota.

Brownish-ochraceous; thorax with three brown stripes; antennrebrown, pale atbase; wings hyaline,stigma infiiscated; discal cell open; the tipof the auxiliary veinisnearlyopposite the origin of the prgefurca;

subcostal cross-vein removed from the tip of the auxiliaryvein at a distanceequaltothelengthofthe stigma. Long. corp. 0.25

—

0.3.

Sy\. Dicranomyiagladiator 0.Sacken,Proc.Ac.Nat.Sc.Phil. 1859,p.212.

Rostrum

paleochraceous,frontbrownish-gray,palpi infuscated, antcnnaj brown,pale at base.

Thorax brownish

ochraceous,

with

three distinct

brown

stripes; the intermediate

one

extends over the collare; thelateralones extend

beyond

thesuture; scutellum

and metathorax brownish

in the middle ;

mesosternum

with

two

large,

round

brow^n spots

between

the fore

and

middle coxfe

and

several smaller, indistinct spots; halteres pale at base;

knob brown

^; feet

brown,

coxas

and

baseof

femora

pale; tip ofthe latter brown.

Abdomen brown,

posterior

margins

of the seg-

ments and

the genitalspaler; falciform

appendages

of the

male

forceps very large (Tab. Ill, fig. 4)^; they are very striking in the living insect,

and when

their points touch each other, they form akind of archorbridgeover both ^lobes.

(The name

^{of the}

insect is derived

from

these sword-like appendages.)

Wings

nearly hyaline; stigma elliptical,

more

orless infuscated; vena- tionexactly likethat of

D. immodeda.