TIIE CANADIAN ENTO}fOLOGIST, 137

ON NORTH A\,TERICAN PHLGOTHRIPID,4 (THYSANOP-TERA), WITH DESCRIPTIONS OF T\YO NE\Y SPECIES.

By J. DOUGLAS HOOD, U. S. tsrol,ocrcAl, suR\rEy.

Tric/tot/trips a?tlntlcerus, sp. nov.-(plate Vf, figs. r-4 )Female.-Forma brachyptera. Length about r.5 mm. Colour clear

brownish yello*', with conspicuous hypodermar pigmentation in head,thorax and abdomen, which is orange by reflected iight and maroon_brow. by transmitted light ; t'be heaviiy chitinized and darker armiddle ; segments 7 and 8 of antennae blackish brown.

Head distinctly wider than long, brunt anteriorly, frons not at arlproduced between ante'n@, dorsal and latera.{ surfaces rvith very minr:tespines; vertex flat, evenly declivous ; gene subparallel, rounded ;postocular bristies pointed, moderateiy long. Eyes greatry red'ced, oniyone facet visible on lateral profile. ocelli rvanting, Antennre slightlymore than twice as long as head, the last two segments compactly united,the separating suture scarcely visible; segment 3 subconical ; 4_6 ovaI,pedicellate; Z+8 lanceolate, pedicellate; segments t and, z exactlyconcolorous with body I 3-6 successively very slightly darker ; 7 + Brather abruptly dark blackish brown I sense cones moderate in rength,slenderl formula: 3, r-r j 4, r-2j 5, r-r*1 ; 6, r_r-,t ; 7, o_r; S riitt",one at middre of dorsum' rfouth-cone not quite attainirlg base of pro-sternurn ; labium broadly rounded; labrum pointed, ,"ur".ly ,urpurringIabium.

Prothorax large, massive, notum weakly chitinized ; it is distinctlyIonger than head (about equal in length to width of head), and across thecoxe is just trvice as rvide as long; bristles long, pointed I anteriormarginals wanti,g. Pterothorax greatly reduced, narrower ard shorterthan prothorax. Legs stout, concororous with body I fore femora short,thick ; fore tarsus armed rvith a strong, acute tooth.

Abdomen large, heavy, about one and one-fourth times as wide aspterothorax ; all bristles poi.ted. Tube thickry chitinized, slightry shorterthan lread, about two and one-half times as wide at base-us ut upr* ;terminai bristles short, about half as long as tube,

Measurements: Length, r.53 mm.; head, Iength .rg mm,, width20 mm.j prothorax, lengtl.r .zo5 mm., width (inclusive of coxe) ,40 mm.;pterothorax, width .37 mm.; abdomen, rvidth .47 mm.; tube, length.r7 mm., width at base.ror mm., at apex .o4r mm, Antennre: Segmlnt

\Iay,1912

CAN. INr,, VoL, XLIV

TRICHOTHRIPS ANOMOCERUS, SP NOV,

TIIE CANADIAN ENTOMOLOGIST.

rt45pj z,56pi 3,62p;4,56y.; 5, Sgtt;6, Srp. j 7,4Stai 8,331l; total,.4r mm.; width at segment 4, .o39 mm.

14ale.-Forna brachyptera. Slightly smaller than female. Lengthabout r.r mm. Prothorax very slightly, if any, heavier than in female.Fore femora slightly more swollen I tarsal tooth a little stouter. Abdomenslender, tapering from near the base.

Measurements: Length, r,o9 mm.; head, length .r7 mm., width,r9 mrn.; prothorax, length.r92 mm,, width (inclusive of coxre),37 mm.;pterothorax, width .32 mm,1 abdomen, width .38 mm; tube, length.13 mm., width at base,o83 mm., at apex.o36 mrn. Antennrc: Segmentr, 45lt ; 2, 5opj 3, 56Fj 4, 49tt, ; 5,S3p i 6, 47l" ; L 43p. ; 8, 291t 1 tolal,.37 mm.; width at segment 4, .o34 mrn.

Described frorn fifteen females and seven males, taken in Februaryttnder sycamore bark at Plummers Island, Nlaryland (in the Potomac nearWashington, D. C.), by IIr. W. L. X{cAtee.

The form of the apical antennal segments seems to ally this speciesquite closely to T, ambitus Hinds, from which, horvever, it is abundantiydistinguished by the shorter tube, shorter and broader head, aud the muchheavier prothorax, The general facies of the species is thus thal. of T.

ledicularius Haliday and 71 anrcricanus Hood.

Crltptolhriy's junctus, sp. nov.-(Pl. VII, fig. r, a, 1,, c.)Fena/e.-Forma brachyptera. Length about r.7 mm. Surface

smooth, shining, anastomosing iines scarcely evident. Colour by reflectedlight bright crimson red ; head and prothorax darkened with blackishbrown ; tube, legs and antennre nearly b)ack. Colour by transmittedlight blackish brown ; the head, prothorax and abdomen rvith a nearlycontinuous layer of bright crimson hypodermal pigrnent I antennre darkblackish brown, segments t and z and pedicel of 3 slightly paler ; legsslightly paler than antennae, non-pigmented, tarsi pale yellow.

IIead rectangular, about one and one-fifth tinres as rvide as long ;cheeks parallel, rounded very abruptly to eyes and stightly flaring at base ;

vertex rounded, slightly produced I postocular bristles long, explanate anddivided at tip. Eyes small, flattened, protruding, anterior in position anddirected forward. Ocelli small, subapproximate, anterior, the posteriorfar removed from the eyes. Antenne seven-segmented, rvith au obliquesuture at middle of ventral surlace ; spines and sense.cones long, slender Iformula i 3, r-2 ) 4, 2-z j 5, r-r*11 6, r-r+r j 7, o-r. Moutl-r-conelarge, heavy, blunt ; maxillary palpi more than half the length of pronotum.

Pmre VllCnru, Enr,, Vor, XLIV

FlL!t(nz-tr-\()=Uz.ao_

E-IFoIFz-r)

-z.

-zrLaalF|tz.l-0o_

t-:trFoF0_

t-a')

TIIE CANADIAN ENTOMOLOGIST,

Prothorax three-fourtl.rs as iong as rvidth of head and (inclusive ofcoxe) slightly more than twice as wide as long I usual bristles all present,long, dilated and divided at tip. Pterothorax much broader than long,sides subparaliel. Legs short, rather siender I fore tarsi armed rvith arather long, acute tooth.

Abdomen stout, about one and one-half tinres as broad as pterothorax ;

sides subparallel at base, converging roundly from segment 6 to tube.Tube about.6 as long as head, distinctly more than twice as rvide at baseas at apex, tapering evenly.

Measurements: Length, r.Z5 mm.j head, length .3o mm., rvidth.25 mm.j prothorax, length .18 mm., width (inclusive of coxre).40 mm.;pterothorax, width,39 mm.; abdomen, width .57 mm.j tube, Iength ,r7mm., width at base .o92 mm., at apex .o3g mm. Antennal segments :

r,48y.1 2,66p1 5,66y.;4,68pi 5, 61p;6, 64p) 7,9op; totallengthof antenna, .41 mm.; width at segment 4r .o37 rnm.

.Fenule.-Forma macroptera. Differs from the bracbypterous formonly in the presence of wings and the consequent increased developmentof the pterothorax.

Fore wings much broader than hind pair, sparsely fringed, and ofequal width throughout ; subapical fringe double for five or six itairs ; thethree subbasal spines knobbed ; wings of both pairs uniformly brorvn incolour.

Male.-Forma brachyptera. Differs fron.r the brachypterous femalein the somervhat slenderer head with subconcave cheeks, as seen fromabove, larger protl.rorax with a thickened median line becoming obsoletebefore apex and base, stouter and slightly arcuate fore femora, longer andstouter tarsai tooth, and the slenderer abdomen

Described from trventy females (trvo of rvhich are macropterous) andeleven males from Baldwin, Michigan, and Mahomet and }lLrrphysboro,Illinois. Specimens rvere taken April r7, August r(r, September 4 andNovember 7, under bark on white oak, soft maple and sycamore, byDr. H. E. Erving, I-. NI. Smith and the writer.

Type locality: Baldwin, Michigan.The seven-segmented antenn?e, elongate maxillary pal;ri and the

armed tarsus of the female distinguisl.r this species at once from C.rectangularis Hood and C. carbonarius Hood, the onll' North Americanspecies properly referable to Crltptot/trips.

During the latter part of August, r9o8, I found pupr of this speciesin abundance at Baldrvin, Michigan, under the loose scales of the bark of

141

742 TIIE CANADIAN ENTOMOLOGIST.

some rvhite oak trees (Quercus olba) wl'tich stood in a lorvland sandy area

between trvo small iakes ; and lvith them was occasionally seen a wingless

male-or, more rarely, a wingless female. By August 3r adults were

plentiful, ahvays wingless, and the males greatly outnumbered the females.

September z females were abttrrdant, and one of those taken rvas

macropterous. September 4 two males and a second rvinged female were

found to have n.ratured in a vial whicli contained pup:e taken September z'

Acant/tot/trips notlicornis Reuter.-(Pl. VII, fig. z.)

This species has long been known as Acanthothri/s nodicortzz's, but

Amyot and Serville's Eop/olhrils corlicis, dating from r 843, is pro-

bably identical with it. The only North American record of the

species is that by Franklin (Psyche, Vol. X, p. 222, r9o3), rvho found a

single female under loose bark on a sycamore tree at Amherst, Nlassa-

chusetts. I'Iy specimens, fonr females and six males, were taken in an

open sandy forest about trvelve miles from Baldwin, X'Iichigan. One hot

summer's day in August many were seen in copulation on the stump of a

young poplar, which two rveeks before had been cut for tent stakes; but

when approached they scampered hastily away or dropped at once to the

ground and secreted themselves amcng the fallen leaves. The ferv taker.r

are all somervhat larger than European examples, averaging nearly one

rnillimeter louger than several specimens (pLesumably cotypes) received

from Prof. Reuter. Tlre drarving and the follorving descriptiotl, based on

North American examples, may be of use to students of the gloup.

Fenale.-I'ength abotlt 3 mm. Dorsal surface closely subreticulate I

ventral surface smooth. Colour by reflected light nearly black ; abdo-

minal segments 3-8 marked at base with a pair of latero-dorsal white

blotches, about equal in size to the second alrtennal segtnent. By trans-

mitted light the colour is dark blackisl.r brown with marooD pigmentation ;

antennal segments r and z concolorous with the body, z paler at apex I

segments 3-5 with base and apex yellorv, intermediate portion biackish

brown ; segments 6-8 slightly lighter than body, the base of segtnent 6

yellowish ; legs corrcolorous rvith body, excepting tarsi and extremities oftibi:e, rvhich are yellowish brorvn.

Head one and one-balf times as long as wide ; sides subparallel, con-

verging slightly to eyes and to base, forming a slight neck-like constrictionl

dorsal and lateral surfaces sparsely spinose, the lateral spines arising from

anterior surface of prominent tubercles, of which about eight are visible

on each cheek ; postocular bristles short, blunt, iuconspicuous, one'third

l'HE CANADIAN ENTO}IOLOGIST. 143

as long as eyes.* Eyes large, very finely faceted, one-third as long as

head and about as rvide as their interval, Ocelli moderate in size ;anterior ocellus slightly overhanging the abruptly declivous vertex.

Autennee slender, about one and three-fourth times as long as head ;

segments 3-6 urn-shaped; 7 and 8 closely united, the latter conical I

sense-cones long and slender, scarcely distinguishable from the antennalbristles 1 formula i 3, r-2 ) 4, r-2'1i !, r-rt1 1 6, r-r*1 ; 7 with one on

dorsum near apex.f l\{outh-cone pointed, attaining the mesosternum.

Prothorax about .6 as lot-rg as head and, inclusive of coxae, about

twice as rvide as long I usual spines all present, expanded distally'Pterothorax slightly rvider than prothorax ; sides nearly straight, slightly

converging posteriorly. lVings large, porverful, arcuate, of nearly equal

width throughout ; fore rvings faintly rvashed at base with brown, and rvith

the three subbasal spines neariy equal in length and blunt; apical fringe

double for about thirty hairs ; hind wings with a faint vein at costal thirdreaching about to middle, Fore femora large ; subapical tooth acute and

directed slightly anteriorly I fore tarsi armed with a broad acute tooth, the

anterior margin of whicb is at right angles to tlte tarsus.

Abdomen large, broadly rounded at apex ; marginal bristles dilated

at tip. Tube about .8 as )ong as head, tapering evenly from base to apex I

terminal bristles about as long as tube'

l'Ieasurements : Length, 3.2 mm.; head, length .43 mm., width '29mm.; prothorax, length,27 mm.' width (inclusive of coxae).56 mm';

pterothorax, lvidth .65 mm.; abdomen, lvidth '69 mm.; tube, length.34mm.,rvidth at base .ro4 mm., at apex .o52 mm. Antennal segments:

r,48lt;2,7311 i 3, r48pi 4, r29lai 5' r2ol.)';6,87 1ti 7,75P';8,44p;total, .73 mm,1 width, 'o42.

Mole-shorter and slenderer than female. Length about 2.6 mm.

Fore femora larger, stouter, nearly as rvide as head I tarsal tooth larger,

slightly curved, Abdomen tapering eveuly from about segment 6 to base

of tube.*Mou1ton, in his Synopsis, Catalogue and Bibliography of North Arnerican

Thvsanoptera, Tech. Ser., zr, Bur. Ent.' U' S. Dept. Agr., states in his key onpage r9 that If , magnaifemoralis, nodicornis and doane.ihave no postocular spines.This is-incorrect as regards the first two species, at least.

tThe formula for the antennal sense-cones is the same as this in both fif,magnafentoralrs Hinds and IL albiaittatus Hood. In the original description ofthJlatier species, however, their positions are not so described, the three rudi-mentary cones and the full-developed one on the outer surface of the third seg-ment hiving been overlooked in the nearly opaque and otherwise unsatisfactorytype specimen'

.IIIE CANADIAN ENTOIIOIOGIST,

ExplalerroN oF PLA'r'ES vI AND vrr.Plole Vf.

Fig. r. ?ricltot/trils aftlmlcerus, sp. nov.-Female, x rr7.Fig. z. ?ricltot/trils ailolnlcerus.-Apex of right antenna of female,

x 514'Fig. 3. Tric/tothri/s ttltontzcerzts.-Tip of abdomen of female j mem-

branous portions stippled j x rr7.Fig. 4. Tric/tol/zrips aill,ilzceras.-Right fore leg of female, x r r7.

Plate Vff.Fig. r. Cryltotltrils junctur, sp. nov.-a, head and prothorax of J ,

x67 ; b,left antenna of ! from Ilichigan, x tgg; r, Ieft antenna of Qfrom Illinois, x r99.

Fig. z. Ifollot/trils nodicorzzzs, Reuterl t, head and pronotunr; x 67.

LASTOPTERYX MANTHOT, N, SP. (DIPTERA).BY E, ?, FELT, ALBANY, N. Y.

The small, yellowish midges were reared from Cassaatt (Mani/totuti/issima), July t5. r9rr, by 1\Ir. W. H. Patterson, of the AgriculturalSchool, St. Vincent, W.I. This species appears to be allied to L. carpittil'elt, from which it is easily distinguished by the narrow wings. Thelonger, stouter antenne in both sexes serves to separate it from a moreciosely allied undescribed form.

I'ta1e.-Length, r mm, Antenne nearly as long as the body, thicklyhaired, fuscous; r3 segments, the fifth with a stem abottt f the length ofthe basal enlargement, rvhich latter has a length % greater than itsdiameter and bears a thick rvhorl of long, stout setae I terminal segmentproduced, lvith a length thrice its diameter and tapering to a narrowlyronnded apex. Paipi yellowish. Nlesonotr-rm fuscous yellowish. Scutel-lum, postscutellum anri abdomen yellowish, the latter sparsely haired.\Vings subhyaline, broad, costa dark brorvn, the membrane rather thicktyclothed rvith linear scales. Halteres yellowish. Coxe arid femora mostlyyellowish, the tibie slightly darker, the tarsi fuscous yellorvish I clarvs veryiong, slender, unidentate, the pulvilli rudimentary. Genitalia ; basal claspsegment moderately stout j terminal clasp segment long, stout. Otherorgans indistinct.

Female.-Length, r mm, Antenne extending to the base of theabdomen, rather thickly haired, fuscous yellowish ; r3 subsessiie segments,the fiith rvith a length about f greater than its dianreter and with a thickl'horl of long, stout setre ; terminal segment reduced, narrowly roundedapically, Palpi yellowish, the first segment subquadrate, the secondnarrowly ova), the third as long as the second, the fourth f longer thattthe third, somewhat dilated. Abdomen apparently lighter than in themale I ovipositor short, terminal lobes narrowly oval and sparsely setose.Other characters nearly as in the male,