190 PROCEEDINGS OF THE NATIONAL MUSEUM

Segment

three ^clavate; four fusiform; liveand six becoming-

more

'j

slender and less fusiform; seven cylindrical; eight sharply conical.

Segment

one and ^{base of}

two

dark brown; tip of two, seven, and eight yellowish brown; intermediate segments pale yellow. Spines paleand weak; sense cones shortand ^blunt.

Trothorax ^{short, only} aboutthree-fourths as longas head; foreand hind marginsnearly parallel and curving backward; one stout spine at each ^angle, one ⁱⁿ middle of sides, and one on each side between ,

those atthe angle and the medianline on both foreand hind margins;

hind anglesappearto entirely cover the fore coxte as a rule; eachfore coxa bears one stout spine. All these stout spines are blunt but not kno])bed. Sides ofpterothorax full and smooth; fore angles oblique;

color ofthorax uniform dark lirown or yellowish brown,

more

orless irregularlymottled with dark red.

Wings

present, narrowed in mid- dle, transparent exceptat base,

where

the fore

wing

bears three long spines

upon

the remnant of the single

median

vein. Fringes long, single, except nearend of hind fringe of fore

wing where

^it isdouble for ten or twelve hairs.

Legs

moderately long

and

slender; fore femora onlyslightly thickened; fore tarsus one segmented and

armed

with a tiny tooth. Allfemora and middle andhindtibit« dark brown;

middle andhind tarsi slightly yellowish orgrayish

brown;

fore tibias

and tarsi bright yellow like middle of antenna?; fore tibias shaded ^; a little with

brown

toward their bases outside.

One

long slenderij

spine near base of each fore

femur

below; each fore coxa with one ⁱ longspine.

Abdomen

broadh^ joined to metathorax

and

but slightl}' wider, ,

widest at basebut less than twice as wide as head; segments

more

orI

less imbricate, tapering gradually to tube.

Tube

about four-lifths as i

long as head, tapering slightly, not swollen at base, bearinga circlet^ij of spinesat tip which areshorterthanthetube. All spineson

abdom-

|

inal segmentsslenderandratherfaint; colorof

abdomen

quiteuniform

j

yellowish

brown

to dark brown. In the lightest colored specimens ^' theirregular dark mottlings

show up most

prominentl}^

Rcdescribed

from

eight females.

Male.

— ^The

^maleagreesquite closelywiththeforegoingdescription;

it isusually

somewhat

smallerthroughout; relativelengths of antennal ^' segments are as follows:

A

^_J_-

_L ^ A ^„§_ 1 1

8.6 11.5 13.5 14.5 14 12.8 12 10

Foretarsi are

armed

with amedium-sized tooth,whichislargerthan thatin the female.

Of

the four spines standing near the hind edge of the ninth segment, the outer pair is very short, stout, and acute; the

abdomen

seems to be

somewhat more

slender than in female.

Described

from

four males.

NO.1310.

NORTH AMERICAN THYSANOPTERA—

HINDS. 191

Food

_J)]^a))t.

—

^Mullein

.

Uahitat.

— ^Ames,

^{Iowa; Amherst.} Massacliusetts.

Genus TRICHOTHRIPS

Uzel.

Head

about as broad as long, Inoadly rounded in front.

Eyes

small. Ocelli presentin boththese species, but oftenwanting-. ]\Iouth cone not longer than its breadth atbase;

labrum

pointedat tip. Fore femora

somewhat

enlarged and tarsi

armed

witli a tooth.

Wings

usually wanting,butpresent inboththesespecies,slenderthroughout.

Abdomen

very broad and heavy; tube very slender in proportion to width of

abdomen:

no scale atbase oftube in the male.

The

two species which I have placed in this genus

may

])e distin- guished

bv

the following characters:

Tubefully aslongasthehead beacJii (p. 192)

Tubetwo-thirdsaslongasthehead uinhitus(p. 191)

TRICHOTHRIPS AMBITUS,

new species.

PlateVIII, figs. 81, 82.

Female.

— Length

2

mm.;

width of mesothorax

0A5 mm.

General color brownish yellow shading to

brown

or reddish brown.

Head

slightlylonger than wide, widestjust behind theeyes, rounded

in front; cheeks straight and converging posteriori}"; at hind edge only six-seventhsthediameter at widestpart; frons slightly elevated between bases of antennte; post-ocular bristles present; a

few

scat- tering small spines

upon

head not raised

upon

warts; surfacefaintly reticulated. Anterior half of head light

brown

flecked with reddish, posterior half fading to j^ellow at the neck.

Eyes

small, finelygran- ulated, compact, not pilose, purplish

by

transmitted light, reddish orange

by

reflected light; ocelli present, subapproximate, paleyellow niai'gined inwardly with reddish

brown

crescents.

Mouth

cone reach- ing nearlyto posterior edge of prosternum; maxillary palpi

two

seg- mented; labial palpi short and thick; labiimi broad and rounded;

maxilla? converging abruptly below the palpi and short. Antenna?

one and three-fourths times as long as the head, eight segmented, though the joint between seven and eight is very indistinct; relative lengths ofsegmentsas follows:

12 18 28 20 21 20 15 8

Segment

one truncate, conical;

two

constricted toward baseinto a broad stalk, cut off squareh^ at end; three to seven slenderly stalked at bases; three to six clavate; seven cylindrical -ovate, very closely united

by

fullwidth of end to eight which is conical. Color of one palebrownish j^ellow;

two and

three clearyellow; four3'ellowat base

192

^I>iiOCEEDING3

OF THE NATIONAL MUSEUM.

^{vol. xxvi.}

shiulino- to ^lij?ht

brown

at end; remaining segments dark brown.

Sense cones on segments^{three to six} very long

and

slender; transpar- entspmes npon ^eachsegment alsolong

and

slender.

Prothoraxthree-fourths as long as head and three fifths as long as wide; fore coxa^ project considerably

beyond

posterior angles.

One medium

length spine on each side of middle

and

nearanterior edge, one near eachanterior angle, oneat middleof each sideand onelonger oneat each posterior^angle.

Mesothorax

equal in width toprothorax and concolorouswith it;

mesonotum

bears one longspine close to base of each fore wing. Metathorax equal in width to mesothorax, nar-

rowed

but very slightly posteriorly, pale yellow in middle, shadedon sides,splashed with red.

Each

fore coxa bears a single longspine on outerside; fore femora

somewhat

^{enlarged; each}

femur

bears a single long, erect spine on the outer side near its extremity; tarsi short and

|

thick, fore pair

armed

with a stout tooth.

Femora

gray -brown, fore!|

pair yellowish brown; fore tibi» and tarsi pale yellow; middle and1

hind tibi?eand tarsialmost white.

Wings

reaching totipofabdomen;

both pairs equal in size, edges parallel, heavily fringed; fore wrings bearing a costal

group

of three long slender spines between the fringe^: andbaseofwing. Colorof wingsclear, transparent,except a slightly clouded bandacross fore wings atabout one-thirdtheir length.

Abdomen

broad and heavy; last three seg-ments tapering abruptly;!

atsixth segment one andone-sixth times as broad as thorax.

Tube

two-thirdsaslongas headand at middle one-seventhas broad as the fourth abdominal segment; terminal spinesabout as long as tube.

A'

stoutbristle projectsanteriorly

from

each side angle of firstsegment;

eachfollowing segment, except tube, bears on each side one spine;

theseare short

upon

first segment and increase in length and sizepos- teriorly. Colorbrownish yellow in middle, shaded with darkreddish

brown

on sides; tube bright brownish yellow tipped abruptly with gray-brown.

Described

from

onefemale.

Male unknown.

Food

2:)lant,

—

^Grass.

Habitat.

—

^Amherst, Massachusetts.

TRICHOTHRIPS BEACHI,

new species.

Plate VII, fig. 79; PlateVIII, fig. 80.

Female.—

'Length. 1.81 nmi. (abdominal segments one-third tele- scoped): width of mesothorax0.18 nun. Generalcoloryellow-brown.

Head

as broadas long, roundedinfront; cheeksslightly converging behind _the middle, setwith scattered, small, stoutspines borne upon small warts; post-ocular bristles quite long and acute.

Eyes

sni:ill.

finely faceted, rounded; ocelli large, distant, posterior

two

almost

.NO.KJio.

NORTH AMERICAN TJIYSANOJ'TERA—HINBS. 193

I

. . . .

IeontiguoiLs with lig-ht j^cllowish margins around eyes, color reddish yellow. Anteiime

more

than twice as long as the head; length and breadth of segments increase gradualh'

from

l)asc to middle, then decrease to tip of antenna; relative lengths of segments as follows:

1