New genera and species of North American Thysanoptera from the south and west

Vol.

XXV,

pp. 61-76 April 13, 1912

PROCEEDINGS

OF THE

BIOLOGICAL SOCIETY OF WASHINGTON

NEW GENERA AND SPECIES OF NORTH _AMERICAN THYSANOPTERA FROM THE SOUTH AND WEST.

BY

^J.

DOUGLAS HOOD

Bureauof BiologicalSurvey.U.^S.Departmentof Agriculture.

The

_present

paper adds

to the

known Thysanopterous ^fauna

of

North America

four

new _genera and

six

new

_species,

while

three species

and one

variety are relegated to

synonomy. ^This

latter is

not

_surprising in

view

of the

number

of

workers who have

described species ^after

but

^little

work on

the

group.

Our _knowledge

of the

western and southern Thysanoptera was

in

1908

limited toa

paper by Dudley Moulton on

the Cali- fornian species.*

One year

later,

however, Mr. D.

^L.

Crawford, then

a

student

at

Pomona

_College,

_Claremont,

California,

was

a

member

of a

party

^of

two which made an entomological expe-

ditionto

Guadalajara, Mexico; and

afterhisreturn

he

described a

supposed new genus and

several

new

_species,t

The new

_genus, to

which _{he gave}

the

name

Rhaptothrips,

has

been

suppressed by

Bagnall,!

who

directs attention to the fact that the

form

described is a

nymph.

Another

_species,

which Mr. Crawford

described as _Liothrips mcconnelli, belongs ⁱⁿ the

genus

Leptothrips

Hood,§

^as

do

_Crip-

tothrips (sic!) californicus

Daniel

^II

and

Phyllothrvps fascicidata (sic! ⁾

Crawford.

^If

Furthermore,

^I

can

detect

no

differences

•I".S. Dept. Agr., Bur.Km.. Tech.Ser.12,I't.Ill,pp. 39-68;1907.

tPomonaCollege Journal of Entomology,Vol.^I.pp. 109-119; Dec,1909; and Vol.

II hi..153-170; March,1910.

tAmi.Soc.Km.Belg.,Tom.- LIY.p.162; 1910.

vSKm._News,Vol.XX,p.249;June,1909.

Ent.News,Vol.XV.p.293; Nov.,1904.

ITPomona^foil.Journ.Km.,^Vol.I,p. 105; Dec,1909. Thevariety slenncepsCraw-

ford⁽ⁱⁱIcm,i>.los)belongsⁱⁿsynonomy,having beenerected for the reception of specie

mensofthetypicalform whichhadnotbecomecrushed ⁱⁿ the mounting. The figure which hegivesonp.107shows^thisfaclverj clearly.

VI—Pi;oc. Biol. Soc.Wash., Vol.XXV, ^1912. (61)

62 Hood — New Genera and

_{Species of}

N. A.

Thysanoptera.

whatever between

a

cotype

^of mcconnelli received

from Mr.

Crawford and two

of

Dr. Hinds' cotypes

^of Cryptothrips asper- sus*

—

the

type

^{of the}

genus —

in the collection of the

United

States

National Museum.

Liothripsbaheri

Crawford _belongs

in or

near

_Mesothrips

Zim- mermann.f

jflolothrips vespiformis

Crawford has been properly made

the

type

^ofa

new

_genus,

—

Franklinothrips Back.'!

Anthothrips ^variabilis

Crawford

(of

which

I

have

ten

cotypes)

isidentical

with

the

type

^of

A. gowdeyi Franklin

§ ⁱⁿ the collec- tion ofthe

United

States

National Museum

; the species

should be known

as Haplothrips

gowdeyi (Franklin).

^Itis interesting to

compare ^{Dr. Franklin's}

figure of the

head and _prothorax (PL LXIII,

fig.

8) with

that given

by Crawford (Pom.

^Coll.

Journ. Ent.,

^{Vol. II,} p. 166,

A).

Idolothripsangusticeps

Crawford was compared

^{at the}

^time

^of

its description

with

Megalothri.ps

(?)

spinosus

Hood,

^{II to}

which

it is

only

distantly related

(being placed

ⁱⁿ a different

family by Bagnall!

), the existence of four

North American

congeners11

and

fiveCentral

and South American ones** having been

^either

overlooked

or

ignored by

^{its describer. It is}

^almost

certainly

synonymous ^{with one}

^ofthese.

Thrips

abdominalfe Crawford has been

since redescribed

under

the

name

Thrips femoralis

by

^P.

^R.

Jones, tt ^of the

Bureau

of

Entomology, notwithstanding

^{the fact(asI}

have been reminded by Mr. H. M.

Russell) that the latter

name was used by Blanchard

in

1851

for a species

from

Chile.XX

The

collection

upon which

^are

^based

^the

new

_generic

and

specific

names

herein

proposed was made

four years

ago

ⁱⁿ

southern Texas and northern Mexico by Mr. ^Charles A. Hart, Systematic Entomologist

^{of the Illinois State}

Laboratory

^of

Natural

History.

Many ^hundreds

^of

specimens were

_taken, all

*Proc. C.^S.Nat. Mas.. Vol.XXVI.p.205; 1902.

tHull,del'lnstitutBotanique de Buitenzorg, No.VII,p.12; 1900.

tEnt.News.Vol.XXIII,p.7:;; Feb.,^1912.

§Proc. U.S.Nat. Mus., Vol.XXXIII.p. 724; MarchI,1908.

t|Can.Ent., Vol.XL,p.306; Sep.,^1908.

ITConiferarum Pergande,andflavipes,armatus,andtuberculatum,Hood.

**SchottiHeeger,andlongiceps, assimilis,affinis,andjoveicollis,Bagnall; thelast

mentionedhasbeenrecentlyremovedby Bagnall ^tothegenus Dicaiothrips Buffa and separatedintotwospecies, Joveicollisandchatnpioni.

++U.^S.Dept.Agr.,Bur.Ent.,Tech.Ser. 23, Pt.I,p. 4; Jan.26,1912.

tlHistoriafisicaypoliticadeChile, Zool.,TomoVI,p. 150.

Hood — New Genera and

_{Species of}

N.

A. Tliysanoptera.

63

of

which, through Mr. Hart's

generosity, are ⁱⁿ

my

^private

collection. In a previous paper,

published

^{in these}

Proceed-

ings,

two

of the

new

_species

were

described

and

_assigned to a

genus

previously

unknown from

the

United

States;

one

of these

was named

Diceratothrips karti in recognition ^{of its collector.}

Mrs. E.

C.

Green (nee

L.

M. Hart)

^{is to} be

thanked

^for her careful outlines

and

first

washes

^of the

two

species illustrated in the

accompanying

plate.*

And,

as usual,

Mr.

R. S. Bagnall, the

English Thysanopterist, has aided

ⁱⁿ

comparing

^certain

species

with

_{the types} of

Old World

genera.

Suborder TEREBRANTIA Haliday.

Family

.EOLOTHRIPTDiE Hamdav.

StomatothrIps gen.

now

((rr6fj.a,

mouth;

Qp^, a

wood worm.

⁾

Head

short, distinctlywider than _long,broadly received^into prothorax, and produced betweenthe non-projectingeyes. Antennae nine-segmented^, moderately slender, insertedvery^close together; segments ^7-0

more

or lesscompactly^united. Maxillary palpi clearly eight-segmented; ^labial palpi five-segmented, the ^basal segment very ^short. Prothorax wider than long, slightly longer than head; posterior margin without strong spines. Fore tibiae

unarmed

;t second fore tarsalsegmentwith the usual book-like appendage. Fore wings

expanded

apically, where _{they are} twice as broad asnearbase.

Abdomen

_very broad at segments⁵

and

6, snbpetiolate; ninth abdominal segment ^of male not prolonged ^{at the} posterior angles^intohooked, clasping organs.

T;ipe: Stomatothrips flnvussp.

now

Thisgenusresembles Orothrips

and

Erythrothrips, Moulton, ⁱⁿ thein- creased

number

ofsegments^of the maxillaryand ^labial palpi; and in that the ninth abdominal segment ^{of the} male ^is simple.

From

both ^it, differs in theexact

number

ofpalpalsegments and ⁱⁿ having wings which are

expanded

apically; furthermore, the antennal segments ^{are free in} Orothrips, and in Erythrothrips the head is elongate and of different structureanteriorly.

That such genera as Orothrips, Erythrothrips, and Stomatothrips have been found _onlyin North America i< of especial interest because of the

•Thetrue lightandshaderelationhasⁱ 11 lostto a great degree^inthereproduc- tionofthe originaldrawings, duetothe use ofaninferior quality of^<ihinesewhite.

fMoulton states thai Orothrips has "all tibiaearmed" (Tech. Ser.i'2,PartIII, Bur. Ent.,^I",s. Dept. Agr.,p.45)but his figures contradict^thisstatement (PI.^I, tigs.1

andi). For a drawing ofan armed tibiasee Uzel,"

MonographiederOrdnungThy- sanoptera," Tab.V.fiK. 38.

XMoulton.inhisgenericdescription of Erythrothrips (Tech.^Ser.21,Bur. Ent.,U.S.

Dept. ^Asrr.. p. 35), gives the number of segmentsⁱⁿ the labial palpi as three; but twenty-two^linesbelow,inhisdescription of thetypespecies,states,^'*labial palpi four segmented."

64 Hood —

Neiv

Genera and

_{Species of}

N. A.

Thysanoptera, light which it seems to throw on the evolution of the Thysanoptera.

These genera probablyrepresent ^the"most _primitive

known members

^of the order; for inno group^{of insectsdoes}specialization result inanincrease inthe

number

ofsegments^{either inthe} body^oritsappendages.

Stoma

^-

tothrips^isthusbestplaced ^atthebeginning^oftheJSolothripidse, possess- ing ^{as it} does

more

_palpal segments than

any

^other

known

_genus.

Inan ancient type

we

would expect ^{to find} broad wings; and ^{this is} actually thecase. Although ^the palpi of Paheothripsfossilis Scudder,*

a Tertiaryspeciesdescribed from the

White

River deposits^of Utah, ^are unfortunately

unknown,

^itisinteresting to note that the forewings ^are broad

and

^similar invenation ^to those of Stomatothrips, though^alittle widerinproportion^totheir length.

Carryingthese generalizations a^little further,

—

if

we may

safelydoso on such scant evidence,

— we

are led to the conclusion that the order Thysanopteraoriginatedⁱⁿornearthe_{tropics of} the

New

World.

And

early ^{in its} evolution it seems that a branch _divergedtoform theUro- thripidse (at present

known

_onlyfromthe Old World) which, havingⁱⁿ the courseof their adaptation ^lost the ovopositor they^at one time _pos- sessed, naturally approach the Tubulifera in general appearance. Mr.

Bagnall has alreadynotedfthatin

many

fundamental characteristicsthe Terebrantia

and

Tubuliferaresembleeachother

more

_closely thandothe Urothripidse

and

Phloeothripidie; but he nevertheless assigns the family Urothripidse^to the Tubulifera. In

my

opinion the family should be

made

the type ^ofa

new

sub-order abundantlydistinguished bythe presence ^of eleven instead of four spiracular openings

—

_certainly a characterof high taxonomicvalueinviewofitsconstancy^{in the}

two

sub-ordersat present recognized.

Stomatothrips

^flavus sp. nov.

Fig. 1, a

and

b.

Female.

—

Length about ^1.6

mm.

(1.47-1.77

mm.).

Color testaceous, head

and

_{prothorax slightly}darker; pterothorax with an indistinct, V- shaped,

brown

cross-band at middle of

dorsum

;

abdomen

with faint indicationsofa pale cross-band on segments 1,2, and :>; antennal _seg- ments 1-4 pale yellowish white, the remainder of antenna black; tibise

shaded withblack.

Head

about one

and

one-fourth times as wide as long, rather deeply sulcate between _antennae,

and

slightly narrower

and

shorter than _pro- thorax; cheeksslightlyarcuate; dorsal

and

lateralsurfacesfaintly trans- versely striate, set with

numerous

minute _spines. Eyes large, pilose, posteriorly prolonged on ^ventral surface,

and

with large, distinct facets.

Ocelli ecpiidistant. Antennae moderatelyslender, about as long ^as

com-

bined_lengthsofhead, pro-

and

mesothorax; segment ¹ broadest, nearly aswide _{as long,tapering}toward apex; 2 distinctlylonger

and

narrower

•Proc. Bost. Soc. Nat.Hist.,Vol.XI,p, 117,1867; Geol.Mag.,FirstSeries,Vol. V, p.221,1868; Bull. U.S.Geol.Surv.Terr.,I,p.222, 1875.

tProceedings International Entomological Congress,II,283-288; 1911.

Hood —

_Neir

(fcnrm and

S/><rir.-< of X. A. 77///w

noplem

^{. (Sb} than ^1; 3-6 long, cylindrical, successively decreasing ⁱⁿ length, 4 ^dis- tinctly shorterthan :'>; 7 slightly longerthan6, usuallyabout _equal to 5 iu length,and narrowing apically; 8 abruptly shorter, one-half to one- third aslong^{as 7}and ^twiceto fivetimes aslong^as9, which ^issubconical

and

_usuallyabout as long^as wide. Segments 1-4 pale yellowish white, 3 and _{4 slightly}

more

whitish, 4 clouded at extreme apex with black;

l"^r. 1.

—

Stomatothripsflavus gen.et sp.

now

Female; ^a,maxillaryandlabial palpi, lateral view,x-525;

b,right forewing,^x93.

5-9 uniform black. Segments ^:5-9 quite thickly clothed with _short, white, inconspicuous ^{hairs of} uniform _length; 5, 6,

and

7 each with a short, linear, pale,sensory areaonventral surface.*

Mouth

conenormaltothe group. Ventral surface ofhead_sparselypubescent

and

withtwo_{pairs of} prominentspines, oneof whichissubantennal

and

theotherof

which

is situated between the posterior angles of the _{eyes, just} anterior to the chitinous thickening.

Prothorax subrectangular, ^slightlywiderthan _long,

and

a littlewider than head; sides

and

_posterior angles rounded; ^{surface with}

numerous

very minute _spines. Mesothorax broader than _prothorax, anterior angles broadly rounded,

mesonotum

transversely ^striate. Metathorax narrowed posteriorly,

metanotum

_nearly smooth.

Wings

^{long; fore} wings

expanded

apically, broadest at apical sixth, where _{they are just} twiceaswide as atbasal fourth; venation normal to the group; spines on anterior portion^of ring vein short, slightly projectingbeyond margin

of wing; ^first and second longitudinal veins ^set with about 20 and 14 short _spines, respectively. Color of fore wings pale brown, ^with

two

white cross hands, one ofthese being ^a narrow oneat basalseventh

and

the othera slightly widerone_{at apical} seventh; intermediate

brown

area

somewhat

_{paler at}middle; hind wings^white.

Abdomen

subpetiolate, atsixthsegment

more

than twiceas wideas at base and one and one-half times aswide aspterothorax^; posteriormargin ofsegments ^1. 2, and 3whitish; segments ⁹and 10 tinged with yellow^or white.

.Measurements of a female from _Odin, Illinois.

—

_Length, 1.7:!

mm.;

head, _length, .17

mm.;

width, ^.21

mm.;

prothorax, length, ^.2]

mm.;

width, ^.L'4

mm.

; pterothorax, width, ^.30

mm.

;

abdomen,

width, ^.47

*Similar areasarealmost certainlj present on segments ^:;and I,bul ^I have not beenabletomakethemouton

my

specimens.

QP> flood

— _{New Genera and}

_{Species of}

N. A.

Thysanopiera.

mm.

Antennal segments: ^{1, oil/*; 2,} 48m; 3, 162m; 4, 141m; 5, 7-V^; 6,

62m; 7, 66m; ^>s, 23m; 9, 12m; total, .63

mm.;

width, ^.025

mm.

.Measurementsofafemalefrom Monterey, Mexico.

—

_Length, 1.47

mm.

;

head, length, .15

mm.;

width, ^.21

mm.;

prothorax, length, .20

mm.;

width, ^.2:;

mm.;

pterothorax, width, ^.MO

mm.

;

abdomen,

width, ^.35

mm.

Antennal segments: 1, Mom; 2, 5(1m; 3, 1M2m; 4, 93m; 5, 67m; 6,

49m; 7, 52m; 8, 25m; 9, 14m; total, .517

mm.;

width,

.025mm.

Male.

—

Similar tofemale, butslenderer

and

with longer antennae.

Measurements^{of a}male from Monterey, Mexico.

—

_Length, 1.07

mm.

;

head, length, .147

mm.

; width, ^.174

mm.

; prothorax, length, ^.160nun.;

width, ^.181

mm.;

pterothorax, width, ^.245

mm.; abdomen,

width, ^.192

mm.

Antennal segments: ^1, 36m; 2, 45m; 3, 154m; 4, 137m; 5, 92m; 6, 77m; 7, 78m; 8, 24m; 9, 8m; total, .65

mm.;

^{width, .027 nun.}

Measurements of antenna of male from Brownsville, Texas:

—

I,31m;

2. 39m; 3, 118m; ^4, 100m; 5, 75m; 6, 67m; 7, 75m: 8, 17m; 9, 8m; total, .54

mm.

; width, ^.027

mm.

Described from a good ^{scries of both sexes as follows:} Monterey, Mex., July 5, 1908, C. A. Hart; Matamoras, Mex., June 30, 1908,

('. A. H.; "Tlahualilo, Mex., Sep. 12, 1910, on cotton,^{J. P.}

Conduit"

(Coll. A. C.

Morgan);

Brownsville, Texas,June _{23, 25; July} 2, 1908, C. A. H.; Dubois, Illinois, July ^2, 1909, C. A. H.; Odin, Illinois, June 25, ^l!t0i»,C. A.

H.

Itappears ^{to be}

common

on _grass and _weeds, as all of Mr. Hart's collections were bysweeping.

Typelocality.

—

Monterey, Mexico.

The

pale coloration ^willdistinguish this species ata_glance.

No

_(hawing ^of the head

and

_prothorax is given because ⁱⁿ a large seriesof carefully

mounted

_specimensIhave been unable to find a per- fectly satisfactory dorsal view.

The

^{structure of the} insect ^is entirely responsible^{forthis. I} have experienced^the

same

difficulty in

mounting

Franklinothrips vespiformis.

Family

THIilPID/E

Haliday.

Bregmatothrips

_{gen. nov.}

{fipiyna, theupperpart^ofthe head; Gp^, ^a

wood worm.

)

Head

long; vertex swollen, produced, overhanging and slightly sur- passing the base ^of antennae. Eyes prominent, protruding. Antennae eight-segmented, ^style

much

shorter than segment (i; all sense cones simple. Maxillarypalpithreesegmented. Prothorax_{elongate,distinctly} longerthanhead

and

_nearlyaslong^aswide, broadestnearbase; posterior angles withtwolongspines; ^all other prothoracic spinesrelatively small.

Wings,

when

present,moderately^slender

and

withoutcolorpattern^{; fore} pairwith two longitudinal veins reaching nearlyto tip; anteriormargin of fore wings ^set with very long

and

slender spines which are scarcely distinguishable from the fringe.

Abdomen

acute, the ninth segment elongate; spineslongandstrong; ninthabdominal segment ^of male not provided withtwo_{pairs of}chitinous dorsalprojections.

Type.—

Bregmatothrips ^venuslussp.nov.

Proc. Biol. Soc. Wash., Vol.

XXV,

^[912.

Plate

IV

L.M.

Han

el J.D.IT.del.

Bregmutothripg venustus, Female, x77

Rhopalothrips bicolor, Female, xl04

Hood— New Genera and

_{Species of}

X. A.

Hiysanoptera. 6^rt This genua ^is suggestive ^of Aptinothrips, Physopus ^{(s. 1.),} Oxythrips, and Rhaphidothrips. Initshould he placed Thrips ^binervis Kobus,* a Javanesespecies differing from venustusin the

much

slenderer form and

tin¹ longer head and _prothorax.

In such genera^of the Thripidse^as Aptinothrips, Paehythrips, Prosopo- thrips, Apterothrips,

Ambly

thrips, and Agerothrips the ^ocelli

and

wings arealways wanting; ⁱⁿ Chirothrips and lAmoihrips ^theocelliare present in the females hut wantingⁱⁿ the wingless males; ⁱⁿ the brachypterous form of the species described by^{Uzel as} Physopus nigrivenlris only the two_posteriorones are present; ⁱⁿ the type species of the present genus thebrachypterous form

may

^{havethree,two, ornoocelli,while the}macrop- terous form always^{hasthree. It will} thus be seen that the presence^of ocelli and wings^arenot even charactersof specific significanceand that their use in generic diagnosescan not beconsidered of any^valuewhat- ever.

Bregmatothrips venustus

sp. nov.

Plate IV, ^first figure; Fig.2, aandb.

Female:

forma

brarhyptera.

—

Length about^1.0

mm.

Colordarkblack- ish

brown

to black, with pterothorax, ^first abdominal segment, ^inter- mediateantennal segments,

and

_legs,yellow,shaded_slightlywith brown;

prothoraxslightly palerthan head.

Head

^about as long ^aswide, slightly shorter than prothorax; ^vertex swollen, producedanteriorly, broadlyroundedasseenfrom above; ^dorsal surface faintly cross striate,

armed

with three _{pairs of} moderately long slender_bristles, the firstpair^situated opposite centerof eyes, thesecond pairplaced almostdirectly behindthe_{posteriorocelli,}

and

the third pair situated_just behindthe_eyes. Eyes moderate^insize, protruding, ^setose.

(>cellilacking or with the anteriorone_greatlyreduced or wanting.

An-

tenna?moderately slender, about 1.8times as long ^as head; segments ¹

and

1 brown, ^{the latter} paler toward apex

and

atmiddle; ^{3 to 5} pale yellow, sometimes slightly shaded with

brown;

6-8brown, concolorous with head; sense cones pale, slender, simple; formula: o, 0-1; 4,0-1;

:>, 1-0; ^C), 1-1

+

^1.

Prothorax_veryslightlybroader than _long

and somewhat

_longer

and

wider than head; posterior angles eachwith two _long, slender spines;

anterior angles with a pair^ofsmaller, weaker bristlesabout_equalinsize tothe posteriormarginal pair; ^allother spines small

and

_scarcelyvisible.

Mesothorax_slightlywiderthan _prothorax, fore angles broadlyrounded;

metathorax _closely united to mesothorax and of about _equal width throughout; meso-

and

metathorax uniform pale lemon_yellow.

Wings

short, reaching^{to first}abdominal segment. Legs rather shortandstout, yellow ⁱⁿcolor; femoraand bases of tibiae,especiallythe posteriorpair, often shaded with brown.

Abdomen

moderatelylong, slender, distinctlybroader thanpterothorax;

•

Inu\indebtedtoMr.A.C.Morgan^forthe privilege ofexaminingaslide of this speciesinthe collection oftheBureauofEntomology.

68 Hood — _New Genera and

_{Species of}

N. A.

Thysanoptera.

apex sharply conical; segment ^{10 with a} longitudinal dorsal suture;

spines on segments⁹

and

10 _{long, strong,} dark in color, and prominent.

Segment ^{1 of}

abdomen

pale yellow, concolorous with pterothorax; ^re- mainder^of

abdomen

dark ^blackisb brown, concolorouswithor_slightly darkerthanhead

and

_prothorax.

Measurements.

—

_Length, 1.02 nun.; head: length, .135

mm.;

width, .140

mm.;

prothorax: length, .158

mm.;

width, ^.ISO

mm.;

pterothorax: width, ^.200

mm.;

abdomen:

width, ^.203

mm. An-

tenna!segments: 1, 24m; 2,33m;

3, 39m; 4,33m; 5, 31m; 6, 51m;

7, 11m; <S, 1om; total, .237

mm.;

width, ^.018

mm.

Female:

forma

macrnptera.—

Similar to forma brachyplera, differing as follows: Length about 1.1

mm.

Color nearly uniform dark blackish brown, with pterothorax very slightly paler

and

with_legs

and

interme- diateantennal segments brown- ish yellow, the former shaded with

brown

or black.

Ocelli always present, sub- equal^{in size,}equidistant.

Mesothorax_distinctlybroader than prothorax and metathorax.

Wings

long, nearly attaining tip of

abdomen,

very pale ⁱⁿ color, shaded with a light wash of brownish; ^fore wings ^with

two

longitudinal veins reaching nearly ^to tip; anterior vein usually joinedby two^crossveins tothe costa andwith aboutnine pale bristles, of which two are usually near apex

and

six or seven near base; the _posterior vein can usually be seen arising fromthe anteriorat basalthree-sevenths; it isset with eight or nine long spines^of which the _apical twoare slightly

more

separated ^atbase; hind wingsslightly palerthan fore wings.

Firstabdominal segment^blackish brown.

Measurements.

—

_Length, 1.14

mm.;

^head: length, .128 nun.; width,

.141mm.;

prothorax: length, ^.1(14

mm.

; width, ^.186

mm.;

mesothorax:

width, ^.233

mm.;

metathorax, width, ^.203

mm.; ^abdomen:

width, ^.270

mm.

Antennal segments^: 1, 2:1m; 2, 32m; 3, 30m; 4,33m; 5, 32m; 6,54m;

7, 10m; 8, 14m; total, .234

mm.;

width, .018

mm.

Described fromseveralfemales^of both _forms, as follows: Matamoras,

Fig.^'l.

—

Bregmatothrips venustus gen.^e\sp.

now

Female; a, head and prothorax.

forma macroptera, xl06; b.left antenna, formabrachyptera, x334.

Hood — _New Genera and

_{Species of}

X. A.

Thysanoptera.

69

Mexico, June 30, 1908, C. A. IFart; Brownsville, Texas, June25and29, July²and 9, 1908,

November

20, 1911, C. A. II.;

Grand

Tower, Illinois,

July,C. ^{A. II.}and J. D. _II.; Cobden, Illinois,June _27, 1909, C. A. II.

Typelocality.

—

Brownsville, Texas.

The short winged form

may

easily be recognized, ^for the transverse hand ^isvisihle to the naked_eye. It occurred

commonly

ⁱⁿsweepings.

Suborder TUBULIFERA Halidav.

Family PHLCEOTHRIPID.E

Uzel.

Genus

IIaplotiirips

Amyot

et Serville, 1K4.° >.

Haplothrips graminis sp. nov.

Fig. ^3.

Female.

—

Length about ^1.5

mm.

Colordarkblackish

brown

toalmost black, with a reddish east due. to the presence ^of

maroon

_hypodermal pigmentation ^{; fore}tarsi, apicalportion ^offoretibiae,

and

basesofinter- mediate antennalsegments, yellow or yellowish.

Head somewhat

_longer than wide, broadest ^at middle; cheeks gently rounded, usually very slightly convergent posteriorly; vertex rounded, slightly produced, the anterior ocellus

slightly overhanging; ^dorsal

and

^lateral

surfaces setwith severalshort inconspicu- ous _spines; pos-tocular bristles rather short,pointed,^lessthan one-thirdaslong as head. Eyes slightly

more

than one- third as long ^as head, not protruding.

Ocelli anterior; posterior ^ocelli opposite anterior third _{of eyes.} Antennae about one

and

one-halftimes as long ^as head, moderately stout; segments ¹

and

2dark hlackish brown, ^{the latter} paler toward apex and ^at middle; 3 yellow, shaded laterally with brown; ^4-8 successively darker in color, ranging gradually from brownish_yellowtoblackish

brown

; seg-

ment

3subcorneal, swollen, very slightly narrower

and

shorter than segment ^4;

4-i; suhglobose, pedicellate, the first as broad as its length exclusive of pedicel;

7 oblong, pedicellate, truncate at apex,

andbroadly united ^to8, whichissubcorneal; sense cones _short, moder- ately stout, those on segments 3 and 4 blunt; formula: 3, 0-1; 4, 2-2;

•">, 1-1

+

'; 6, 1-1; 7 withoneon

dorsum

_{near apex.} .Mouth cone _blunt,

abouthalf as long^as head,slightly surpassingmiddleofprosternum.

1'rothoraxalittle

more

than two-thirdsaslong^ashead,

and

_(including coxae) about 1.8 times as wide _{as long,} surface nearlysmooth; ^anterior marginalspines greatly reduced insize

and

scarcely visible^; othersblunt.

Fig. ^;;.

Haplothrips graminis sp.nov.

Female, headand prothorax,x96.

70 Hood — New Genera and

_{Species of}

N. A.

Thysanoptera.

thetwo _{pairs at} the posterior angles longest; midlaterals short. Ptero- thoraxslightlywider than _prothorax,aboutasbroad as long, sidesgently arcuate,slightlyconvergingposteriorly.

Wings

present,clear; forewings distinctlynarrowed at middle, with a _slight brownish cloud at extreme base,

and

with the subapical fringe on the posterior margin double ^for aboutsevenhairs. Foretarsi

armed

witha small, acute^tooth.

Abdomen

slightly wider than pterothorax.

Tube

rather _short, less

than .b' aslong^ashead, about 1.7times as long ^{as its} basal width, ^suf- fusedwith

hypodermal

pigmentation.

Measurements.

—

_Length, 1.5

mm.;

^head: length, ^.200

mm.;

width, .171

mm.;

prothorax: length, .150

mm.;

^width (including coxae), .2<i<i

nun.; pterothorax: width, ^.200

mm.; ^abdomen:

width,^.320

mm.

; tube:

length, .117

mm.

; width, atbase, .057

mm.

^; atapex, ^.032

mm.

Anten- nalsegments: 1, 33m; 2, 39m; •">,37m; 4, 42m; 5,39m; <>, 36m; 7, 3(>m; x,

25m; total, .29

mm.;

width; ^.029

mm.

Male.

—

Similar to femalebutslightlysmaller (length about 1.2

mm.

).

and with slenderer antennae.* Fore femora often swollen; ^{fore tarsi}

armed

with a rather _large, stouttooth.

Abdomen

slender.

Describedfroma good^{series of}bothsexestaken by Mr. ^C.A. Hartat Brownsville,

Loma, and

on PadreIsland oppositePt. Isabel, Texas,ami at Matamoras, Mexico, ⁱⁿ June, July, and

November.

It

was

rather

common

insweepings, and was once taken in tiowersof Clematis

drum-

mondii.

Typelocality.

—

Brownsville, Texas.

This _speciesisvery ^{close to}

H.

_govlfleyi Franklin. But in a series of over_thirtyspecimensthe prothoracic and postocular ^bristlesare always pointed

and

_shorter, with the anterior marginalsgreatly reducedⁱⁿ size;

theantennae arealways

much

darkerin color; andthereisno^sensecone on the innermargin ^{ofthe third}antennal _segment.

The

figuregiven herewith

was

unfortunately

made some

timeago from a specimen which, though freshly-Hilled, had the head unusually nar-

nowed

at base.

* Scop.eothrips gen.

now

((TKwwaws, adwarf; 6p^, a

wood worm.

)

Body

veryshort,broad,compact.

Head

fully asbroadas long,cheeks

snl(parallel; front produced between eyes, separated from their anterior margin by ^a deep furrow, and bearing the anterior ^{ocellus at its} ex- tremity.

Mouth

cone _short,heavy, attaining^foremargin^ofmesothorax.

Antennaeeight-segmented, ^all segments ^free

and

of normal form. Legs short, stout; fore legs of maleoften greatly swollen, the femora serrate on innermargin and^{with a} strong basal tooth; ^tarsi ami inner apex ^of

tibiaeeachwith astrong toothⁱⁿ the male.

Abdomen

_moderatelylarge, broad_{at base,} thence tapering^{totube. All}prominent^bristles,excepting thoseat apexof tube, infundibuliform.

Type.

—

Scopieothrips unicolorsp. nov.

*Trybomnotes in his original description that this^istrue also ofH.bagnalli.

Hood — New Genera and

_{Species of} X. A. Thysanopterd. ⁷¹

To

the _present genus, which isprobably ^!>est placed near Ifaplothrips,

I have_assigned asingle, minute, winglessspeciesremarkable forthe very broad, infundibuliform bristles, the peculiar structure^of the vertex, and the swollen,

armed

femur^{of the}male.

ScopaiOthrips unicolor _sp, nov.

Fig. ^4,aand b.

Female^:

forma

bracyptera.

—

Length about^.it

mm.

Colordarkblackish In-own, pterothorax ^often paler

when

_{viewed by} reflected light; tarsi, apices of fore tibiae, and antenna! segments 3-6, yellow. Dorsal surface sculptured, shining.

Head

_slightlywider than long; cheekssubparallel,witha short, collar- like widening^at base; ^dorsal and lateralsurfaces with deep, close,trans- verse strkeand shortstout spines; postocular bristles short, infundibuli- form, similar ^{in size} and shape ^to a pair ^at the _posteriorangles^of the theeyes. Eyes ^rather

coarsely faceted, with occasional briefspines between facets. Pos- terior ocilli directed antero-laterally.

An-

tennaeslender, slightly

more

than twice ^as long^ashead; segments

1,2,7,andSconcolor- ous with body, except- ing apex ^of 2, which

is distinctly yellowish;

:;-!) uniform _{pale yel-}

low, clavate, pedicel- late; 7 oblong, pedi- cellate; 8 subcorneal;

sense conesmoderately

stout, almost _perfectly transparent; formula: .'!, 0-0; 4, 1-1; 5, 1-1

+

';

(J, 1-1; 7 with one on

dorsum

_{near apex.}

Prothorax about ^.7 as long ^as head

and

_(including coxa-) about two ami one-half timesas wideas long; ^all usual spines present, very short andbroadly infundibuliform;* coxal spine wine-glass-shaped as seenfrom above; ^dorsal surface at each sidewith a depressed

and

concentrically striate area which is lobed mediad; remainder of dorsal surface trans- versely ^striate. Pterothorax lar^e, broader than prothorax, subrectan- gular;

mesonotum

_closelytransversely ^striate (thestriae bent posteriorly atthe

median

line)andwith two pairs of dilated equidistant ^bristles on posteriored^e;

metanotum

^{with a}pair ofsimilarbristles atmiddle (about

*The bristlesareall paleamitransparent,andⁱⁿbalsammountsvisibleunder high poweronly^aftera vers carefuladjustmentofthe_light. Inthe figurethe basesof sev- eral have been shown although the bristles themselves could not ]><• distinguished against thedark-colored notum. Thisi>true also ofRhopalothrips bimlorsp.nov.

Fig.1- beadand

Scopseothrips unicolor gen.et sp.nov.

prothorax, female,x93; ^6.right fore leg, male,ventral view. x283.

72 Hood — _New Genera and

_{Species of}

N. A.

Thj/sanoptera.

as farseparated^asthoseof

mesonotum

)

and

with _verycloselongitudinal striae. Legsstout; fore ^tarsi

armed

with a moderately long, acutetooth.

Wings

attaining ^first abdominal segment, the three subbasal spines^in- fundibuliform.

Abdomen

broadest at segment ^2, thence tapering almost straight to tube.

Tube

between .6and.7aslong^ashead, ^lessthan twiceas wideat baseas at apex; sides straight. Marginal

and

internal abdominalbristles very short, enormously ^{dilated, the} former _curving posteriorly; bristles atapex ^{of tube} short,pointed.

Measurements.

—

_Length,

_.92mm.;

head: length, .14

mm.;

width, ^.15

mm.;

prothorax: length, ^.10

mm.

; width (inclusive of coxa;), .25

mm.

;

pterothorax, width, ^.27

mm.; ^abdomen:

width,

.30mm.;

^tube: length,

.09mm.;

^width at base, .053

mm.;

^at apex, ^.021)

mm.

Antennal _seg- ments: l,21m; 2, 36m; •"-,'>»; 4,42m; 5,42m; <;,39m; 7, 36m; 8, 29m; total, .285

mm.

; widthatsegment ^{4, .025}

mm.

Male:

_forma Lrachyptera.

—

_Slightly shorter than _female; fore legs usually greatly enlarged, the femora serrateoninner margin

and

with a strong ^basal tooth; fore tibia with stout, blunt tooth on innermargin ^of apex; ^tarsal tooth verystrong.

Paratype^{: Xo.} 14,(593, U. S. National

Museum.

Describedfrom anexcellent series of both_sexes,taken during June and July on _Opuntia, atBrownsville, Texas, by Mr. ^{Charles A. Hart.}

Thisinteresting species^is the smallest

known

Tubultiferon. In _living specimens^theenormouslydilated bristlesappear^as minutewhitedots.

Rhopalothrips

gen. nov.

(p6-n-a\ov,club; 6p^, a

wood worm.

)

l>odyvery short, broad, compact.

Head

as broad _{as long,} widest in basal third, narrowed anteriorly; eyes scarcely extending onto ventral surface.

Mouth

cone_short, heavy, attaining^foremargin^ofmesothorax.

Antennae eight-segmented, the last three segments compactly united;

second segment subglobose, conspicuouslywidened; thirdsegment ^short and conspicuously narrower; antenna! spines and sense cones very slender

and

weak. _Legsshort, stout.

Abdomen

moderatelylarge,broad, All prominent body ^bristles, excepting those^at apex ^{of tube, infundibu-} liform.

Type.—Rhopalothrips ^bicolorsp. nov.

It is difficult to sayjust whereinour _present classification thisgenus should be placed.

The

union ofthe three_apical segments^oftheantennae suggests DermotJirips hawaiiensisBagnall

and

Cephalothrlps monilicornis Reuter,

and

other points^ofstructurewouldseem toindicate relationship with the genus Haplolhrips. ^It probably belongs ⁱⁿ the Haplolhrips- Zygothrips-Cephalolhrips-Hindsiana^serieswith Scopseothrips gen. nov.

In the preceding generic description ^Ihave

abandoned

theuse_{of pres-} ence or absenceof ocelli and wings, because such characters are ^of no value even as specific ones. In certain Phloeothripid genera, such ^as Trichothrips Uzel

and

_Allothrips

Hood,

^whosespecies ^liveunder bark or

Rood — _{New Genera and}

_{Species of X.}

_A.

Thysanoptera.

73

in other secluded places, theocelli arc lackingⁱⁿ apterous^or brachypter- ous generations

and

_present in macropterous ^ones; while in the genera which constitute the main hulk of the familyand whose _species donot spend ^{their lives in} hidden _places, the ocelli are always, and the wings usually, present. ^{It is} interesting^to note,however, that the reductionof theeyesand theabsenceofocelli can notalways he ascribedtoa decrease in the _light intensity, for this wingless species has no _{ocelli, yet} lives

exposed^tothe rays of a tropicalsun on theleaves ofan intensely xerophil- OUS _plant.

Rhopalothrips ^bicolor sp.

now

Plate IV, second _{figure; fig. 5,}aandb.

Female^:

forma

brachyptera.

—

Length about

.9mm.

_{Head, prothorax,} meso- and

metanotum

black;

abdomen

and metapleurae white, segments 2-8ofthe formereach with _{a pair of} small granulate black dotsondor-

sum

^: legswhite, the ^tibiaeofsecond

and

third pairs handed with black, anterior

and

middle femora black

at base; antenna' white, segments 4and6-8 dusky, the^lasttwo_espe- cially ^{so. (}

By

transmittedlightthe heavy ^white pigment ^oftenappears nearly black, ⁱⁿ

some

_specimens almost reversing the coloration ^as described above.) Dorsal surface non-sinning, densely granulate ⁱⁿ dark colored_portions, the granules tending^tocoalesceinto lines ofre- ticulation; ventral surfacesmooth.

Head

_slightly wider than _long, widest in basal thirdand narrowed toward _eyes, witha mediancarina above insertion of antenna'; dorsal and lateralsurfaces sparsely spinbse with _brief, transparent, pointed spines; postocellar ^bristles large, dilated; asecond_{pair of}prominent bristle-insertions visible at inner

posterior angle ^of eyes; postocular ^hristles wanting. Eyes with _coarse, separated facets,between which areminute, stout spines. Ocelliwanting.

Antenna' short, stout, about twiceas long^as head ; segments 1, 2,3,and 5 nearly white; ¹

and

^")_slightlydarkened with yellowish; ⁴

and

⁽ⁱ_dusky brown, ^theformer_{paler atapex, the} latterpaler^atbase; ⁷and8uniform blackish brown; segment ² subglobose, pedicellate, conspicuously the broadest in entire antenna; ^:; short, slender, claviform, conspicuously narrower

and

weaker than 4; 4and 5 clavate, pedicellate; 6-8successively shorter, together forming ^a compact, pedicellate club; sense cones

and

spinesexceedingly small

and

weak; segment²with a broad, infundibuli- form hristle oninnerside of dorsum; segment^I!withoutsense cones.

Fig.5.

Rhopalothripsbicolor gen.et sp.

now

Female;a,head and prothorax,xy:!;

h,rightantenna,x206.

74 Hood — _{New Genera and}

_{Species of}

_{N. A.}

Thysanoptera.

Prothorax about ^.7as long ^as head and (inclusive of coxae) approxi- mately two and^{a half timesas}wideaslong; ^allusual spines present, very shortand broadly infundibuliform^;*coxa] spine wine-glass-shaped^asseen from above; ^dorsal surface at each side with a broad, shallow ^fovea.

Pterothorax large, broader than prothorax, subrectangular^; meso-

and metanotum

each with one pair of large, dilated bristles near posterior margin. Legs stout; lure tarsi

armed

eachwith a minute, ^{acute tooth.}

Wings

attaining ^first abdominal segment,the three subbasal spines ^in- fimdibnliform.

Abdomen

slightly broaderthanpterothorax, heavy, roundly narrowed

to tube.

Tube

alittle

more

than .(> as long ^as head, ^less than twice as wideatbase as atapex,sides straight. Marginal and^internal abdominal

bristles very short, enormously dilated, the former curving posteriorly;

bristlesatapex ^{of tube}short, pointed.

Measurements.

—

_Length, .93

mm.;

^head: length,

.126mm.;

width, .144

mm.;

prothorax: length, .090

mm.;

^width (including coxa?), .224

mm.;

pterothorax: width, ^.240

mm.

;

abdomen:

_width, .270

mm.;

tube:

length, .079

mm.

;width at base, .044

mm.

; atapex,^.026

mm.

Antenna!

segments: ^{1, 21m;} 2, 35/*x _32/*; •'>, 27mx lSit; 4, 2>:!/*x25/*; 5, 36/*; <>, :>5/*; 7, 24/*; 8, 18/*; totallength^ofantenna, ^.23

mm.

Paratype^{: No.} 14,694, U. S. National

Museum.

Described from forty-nine females taken July ^4, L908, on Opuntia ^at

Topo

^Chico (nearMonterey), Mexico, by Mr. Charles A. Hart.

With the exception ^of Cryptothrips dentipes Renter, which has a pale prothorax, ^{this is}the only bicoloredspecies ofthe suborder.

Genus

Liotjirifs Uzel, 1895.

Liothrips ^varicornis sp. nov.

Fig. (i, a

and

b.

Female.

—

Length about ^2.1

mm.

Colordark blackish

brown

_{or black;}

tarsi, articulations of _legs, apices^of antennal _segments, and tip of tube paler; thirdantennal segmentabruptly pale yellow.

Head

about one

and

one-fifth as long^aswide, broadest across cheeks;

thelattergently arcuate,slightlyconverging posteriorly^; vertex_elevated, produced, anterior ocellus distinctly overhanging; ^dorsal and lateral surfaces finely transversely striate, setwith several short, inconspicuous spines; postocular ^bristles pointed, about as long as eyes. Eyes large, finely faceted, not at all protruding, one-third ^as long ^ashead. Ocelli anterior; posterior ^ocelliopposite anteriorthird of eyes. Antennaetwice aslong^ashead,moderately^slender; segments ¹

and

2nearly concolorous with body, 2 slightly paler toward apex and ^at middle; 3 pale yellow, slightlyclouded _apically; 4-8 nearly concolorous with body,slightlypaler atapex^; segments 3-6clavate, pedicellate; ⁷ oblong, pedicellate; Ssub- conical; sense cones _{slender, colorless;} formula: _3, 0-1; 4, 1-1

+

¹; 5, 1-1

+

¹; 0, 1-1

+

¹; 7 with oneon

dorsum

_{near apex.}

Mouth

coneacute, slightly surpassing base^of presternum.

*SeenoteunderScopseothrips unieolor,^{p. 71.}

Hood — _{New Genera and}

_{Species of} N. A. Thysanoptera. 75 Prothorax two-thirdsas long^as head, and ⁽_{including coxse)} about 2.3 timesas wideas long; ^all spines present, long, pointed,

brown

in color, the two pairs near the posterior angles longest; coxa! spine pointed, a

littleshorter than the anterior marginals. I'terothorax slightlywiderthan prothorax and a little wider than _long; sides subparallel, slightly con- vergingposteriorly.

Wings

long, closely fringed, not nan-owedatmiddle;

fore wings mar- gined ^{witli a} slightshading^of

brown

and with a narrow, me- dian

brown

bar originatiii^ just

beyond^thethree subbasal spines and becoming obsolescent he- fore apex ^of wing; ^subbasal spines ^{set in a}

narrow, ^da

^rk brown, longitu- dinal vitta; sub- apical fringe ^i>n posterior mar- gin double for about fourteen hairs;

hind w ings clear.

Legs notlong, a little

stouter

than usual in

tlie genus; ^fore tarsi unarmed.

Abdomen

_{large,slightly}wider than pterothorax, tapering roundly from segment ^{6 to baseof tube.}

Tube

about .9as long^as head, twice ^as wide at hase as at apex, tapering evenly ^{for its entire} length.

Abdominal

bristlesmoderatelylong, pointed, pale: terminal bristles slightlyshorter than tube.

Measurements.

—

_Length, 2.13

mm.;

^head: length, .270

mm.;

width, .221

mm.;

prothorax: length, .180

mm.;

width _{(including coxa';,} .40")

nun.: pterothorax: width,^.465

mm.

;

abdomen:

_width, .510

mm.

;tube:

length, .248 nun. ^; width at hase, .096

mm.;

^{width at} apex, ^.048

mm.

Antennal segments: 1,39m; 2,60/*; 3, 87/*; 4, 78/*; 5,75/*; 6,68/*; 7, 63/*; 8, 41m; total, .511

mm.;

^{width at} segment ^{I, .041}

mm.

Described from one female, taken in sweepings from grass and weeds

at Monterey, .Mexico, July 5, 1908, by Mr. ^CharlesA. Hart.

The

_largesize,short head, longspines,

and

the peculiar antennal colora- tion atoncedistinguish this speciesfrom it>allies.

Fig.6.

—

Liothrips varicornissp.nov. Female, holotype;

a,bead and prothorax, x94;

6,segmentsII-IY of rightantenna,^xl72,