202 PROCEEDINGS OF THE NATIONAL MUSEUM

NO. 1310.

NORTH AMERICAN THYSANOPTERA—

HINDS.

203

1

204 PROCEEDINGS OF THE NATIONAL MUSEUM.

^vol.xxvi.

bltu-k: (x'olH present, small, frequently

more

orloss hidden by irregu- lardai-k-red local pigmentation, placedwell forward

upon

an elevation between the eyes; postocular bristlesquite ^long.

Mouth

cone short and blunt; la})rum not constricted abruptly. Antennae verylargeand long, fullytwo and one-half times^aslongas head, with asemicircular, shelf-like supportbelow^ bases; basesapproxmiate; elevation between

them

extending half the height of ^first segments; relative lengthsof seo-ments as follows:

1

NO.^1310.

NORTH AMERICAN THYSANOPTERA—HINDK 205

coii.siderably enlarged and tooth

upon

tar.sus quite stout.

Abdomen more

slender than infemales and tapering

more

g-raduall3\

Described

from

five males, all short winged.

Cotype.—Ciit. No. 6335,

U.S.N.M.

Food

i^lan U.

— G

^rasses

,

Ildhitat.

—

^Amherst, Massachusetts.

This species is

named

forProf. Herbert Osborn,

who

hasfor

many

years

shown

consideralilc interest in the study of tluvse tiny insects.

Genus CRYPTOTHRIPS UzeU

Head

cylindrical, fully one and one-half times as long as wide.

Eyes large

and

prominent. Vertex strongh^ elevated and bearing the anterior ocellus at itsextremity. jSIouth cone about as long as its

breadth at base and reachingal)out two-thirds across the prostcrnum;

labrum ])lunt. Prothorax al)Out as long as width of head.

Legs

slender; forefemoral)utslightlyenlarged; foretarsiunarmed.

Wings

present, slighth^ narrowed in middle.

Male

with a scale at ])ase of tube.

I iind only one species belongingto thisgenus, asjyer.'^Hs.

CRYPTOTHRIPS ASPERSUS,

new species.

PlateX, figs. 104-10(3.

Feindh'.

— ^Length

^{l.^iS}

^mm.

^{(1.45 to 2}

^mm.);

^{width of} mesotliorax 0.32

mm.

(0.28 to0.36 mm.). Generalcoloryellowish l)rowntobrown- black;

body

and legs considerably

marked

with irregular, dark-pur- plish,

hypodermal

pigmentation.

Head

cylindrical, one and one-half times as longas wide, about as wideaslength of prothorax; cheeksalmoststraightandnearlyparallel, set with a

few

minute, slender spines; postocular l)ristles short; sur- face of head linely cross-striated. Eyes quite large, finely faceted, very slighth^ protruding, dark-purplish red with pale yellowish inner margins; ocelli present, small and inconspicuous, frequenth^ concealed by local

hypodermal

pigmentation, situated far forward; posterior ocelli close to margins of e3'es, frontone on apex of prolongedvertex of the head.

Mouth

^cone rather short, reaching only to middle of prosternum; maxillarypalpi longandslender; sides oflabrumstraight,

itspoint l)lunt. Antenntvinsertedl)elow vertex,approximateat base, slightly moi-e than one and one-half times as longas the head, quite slender; relative lengths ofsegments as follows:

1

20(>

PROCEEDINGS OF THE NATIONAL MUSEUM.

^vol.xxvi.

Prothoraxsmall, scarcely two-third,s as ^long- as head.

One

spineat each posterior angle alone prominent; those at fore angles smaller than the anterior marginals; all indistinct; midlaterals wanting; pos- terior marginals small and not visible except on lightest specimens withcareful focusing. Pterothorax approximatelyaswideasahdomen;

itssides nearly ^straightand parallel.

Wings

present; hind fringeof fore

wing

double for five orsix hairs near tip.

Legs

long and sleri- der; fore coxie projecting strongly; fore femora scarcely thickened|i

and tarsi unarmed; one spine near base of each fenuir ^belovv

much

|

longer than others on ^legs and longeston for(>, femora; legs concol- orous with l)ody.

Abdomen

^{long and} slender, cylindrical to about seventh

segmentJ

about twice as wide as head,

from

seventh segment tapering ([uite

,

graduallyto tube.

Tube

short,onlyone half aslongas head; itssides^I straight and converging ^slightly; width at n)iddlc about one-third width of head; terminal hairs at)out as longas tube. Spines at sides, of

abdomen

slender, pale, and not very prominent; segments usually overlapping considerably; sidesdarkest in color.

Described

from

eight females.

6%^>6^.—Cat.No.'6336,

U.S.N.M.

Male.

— ^Male

^about five-sixths as large as female, though antenna' are(>f about

same

size in both sexes; relative lengths of segments as follows

1

^ ^^ ^ ^6

^]_

^{^}

^>

8 12 16.5 16 13 12.5 11 8

Abdomen nmch

smallerthan in female and tapering gradually from baseto tip.

Described

from

one specimen.

Food

plant.

—

^Grape.

llahltat.

—

^Amherst, Massachusettso

Genus IDOLOTHRIPS Haliday.

Anteriorocellus remote

from

the baseof the antennw. Proboscisi.1

reaching the base of the prosternura; lal)ial palpi papiliform; vein oneof the fore wings shortened

by

one-half or abbreviated.

Head

very long, rounded;

abdomen

hollowed out.

Antenmc

slender, three or four timesas longas the thorax; prothorax unequally tuberculated;

metatarsi unarmed. Size large,

marked

with three or

more

lines.

In this genus I find only thespecies conffcrarmii.

IDOLOTHRIPS CONIFERARUM

^Pergande.

PlateX, tigs. 307-110.

IdolothripsconiferarumPergande,Entom. News, YII, 1896,pp.^63-64.

IdolothripsconiferarumTrybom, Festskrift for Lilljeborg, 1896,p. 218.

«Thisgeneric descriptionistranslatedfromHaliday'soriginal description.

$,0. 1310.

NORTH AMERICAN THYSANOFTERA—IflNDS. 207

1.^

Frmalc.

— ^Length

about4

mm.

(3.34 to •i.2<) mm.); breadth of meso- thorax 0.55

mm.

(U.5(> to 0.(50mm.). Color coal-blaek without mark-

ings.

Head

long"and cylindiical; proi)ortional length

more

\'aria])le than

in mostspecies, but averaging about

two

and one-third timesas long

a.s wide; surface of head transverseh' finely striated; cheeks setwith a

number

of short, stout spines; headIn'oadenedatrifle justbefore the neck-like constriction at the l)ase; vertexproduced into avery promi- nent, conical hiuiip in front of the03'es and overreaching the insertion of the antenna*.

Eyes

large, finely faceted, bulging slightly, extend- ing as far around on under sideof head as on u])])er; ocelli small, Avidely separated, the anterior one occupying the extreme vertex; the posterior ones, nearly on a line Avith the middle of the eyes and close totheir margins, are often invisible, unless in favorable light,

owing

totheopacityofthe head.

Mouth

cone short

and

rounded. Antennae approximate at base, inserted under the vertex, only about one and one-sixth timesas long as the head, and slender; relative lengths of segments as follows:

1

208 PROCEEDINGS OF THE NATIONAL MUSEUM.

^vol.xxvi.

Male.—

Conivixry to the usual ^rule, these

two

specimens are longer than the ^{females,^} being 4.22

mm.

(4.34 to 4.10 mm.).

They

are

somewhat more

slender, especially through the middle of abdomen.

Heads

about

two

andtwo-thirds times^aslongas wide; antenna; longer than ⁱⁿ female, ^a))outone and ^{one-lifth times as}long as head; relative lengths^of segments as follows:

12^4 ^^

^{'^}

A

14 20 42 34 29.5 21..5 14.5 15.5

Prothoi-ax nearly one-half^as longas the head; fore feujora consid- erably thickened (almost ^as broad as the head)

and

each fore tarsus bearing an extremelystout tooth; foretarsiandinside of tibiffi yellow.

Abdomen

at second

segment

only two-elevenths as broad ^aslong;

tube three-fourths^aslongas head and very ^slender.

Male

newly described

from two

^specimens.

Food 2>lants.—Pinm

lops,

Jimiperm

^{r!r<jinland, and Ahlcs sp.}

Found

on eithergreen ordry branches in spring

and

early fall and hibernating underbark.

Ilahltat.—^env Washington,^District of Columl)ia; Amherst, Massa-

chusetts. »