TWO NEW HYMENOPTERA.

OP WASHINGTON, VOLUME

XIII, 1911.

233

TWO NEW HYMENOPTERA.

BY

J. C.

CRAWFORD.

THRIPOCTENUS, ^new

genus.

Belongs

^to

^the

^tribe Tetrastichini;

antenna* with two

_joints

in

the

funicle,

one _{very small}

_{ring joint,}

club

three-jointed, the joints

fused

_{(fig. 2);}

parapsidal furrows

indistinct, ^in-

complete; mesonotum without

a

median _groove; scutellum without

longitudinal

grooves; propodeum ^without

^a

^median

carina; spiracles

round; submarginal ^vein very

^short,

mar-

ginal vein long,

stigmal

^short,

the knob almost

subsessile;

postmarginal vein developed

(fig. 3)

though ^not showing

distinctly, as it is, as are

the other

_{veins, colorless;}

marginal

fringes of anterior

wings ^{almost two-thirds}

^as

long

^as

the

greatest

width

of

the wings.

FIG.2. Antennaof FIG.3. Postmarginal^vein

Ttiripoctenux. of Thripoctem/x.

The _{only other genus}

in this tribe

known

to

me which has two

_joints in

the

funicle ₍

Winnemana)

^is readily separ-

ated by ^the presence

^of

two

longitudinal

grooves on the scutellum.

Thripoctenus

russelli,

new

_species.

Female.

Length

^{about 0.6}

mm. Head

and thorax black, the ab-

domen brown

with a large basal flavous spot; head thin anterio- posteriorly, collapsing after death; antennae testaceous, the pedicel longer than ^the

two

joints of the funiclecombined; secondjoint of the funicle longer than the first (seefig. 2) hairs on antennae long; head and thorax smooth, polished; legs including the coxae testaceous;

wingshyaline, the veins^colorless.

Male unknown.

Habitat: Compton,

California.

Type:

^Cat.

No.

_14353,

U.

S.

Nat. Mus.

Described from _specimens

reared

from Hcliothrlps

^fufdiilns

by H. M.

Russell

and

_J.

E. Graf and

sent

under number 618.

The

_species is

named

ⁱⁿ

honor

of

Mr.

_Russell,

who

first

found

^it.

234 PROCEEDINGS ENTOMOLOGICAL ^SOCIETY

Tetrastichus

doteni,

new

_species.

Female.

Length

^about2

mm. Dark

olivegreen, shining; the face collapsing after death; antennae brown, joints of funicle subequal ⁱⁿ length,thefirst about as long as the pedicel;

mesoscutum

finely lineo- lated, thelines mostly longitudinal; scutellum withsimilar but

much

finer sculpture; parapsidal furrows very deep;

median

lobe of

meso- scutum

with _setigerous punctures, arranged ^inthree

more

ofless dis- tinct

rows

_{along each} lateralmargin, ^theouter line nearthe parapsi- dal furrow; disk of

metanotum

_finelyreticulately lineolated;

median

groove^of

mesoscutum

distinct; the pair ofgrooves on the scutellum

more

distinct;

median

carina of

propodeum

^{developedinto abroadened}

plate,wideningbehind, ^its

apex

being the

median

_{portion of}the_apical carina of the

propodeum;

^{on each side of this plate the surface is} sculptured^toresemble faintly developed, thimble-likepunctures; pre- pectus lineolated; mesopleurae ⁱⁿ part faintly lineolated, the rest smooth, polished; metapleurae with sculpture similar ^tothat on the propodeum, butstronger; marginalveinnot

much

longer than^{the sub-} marginal, stigmal^lessthanhalf as long asmarginal; ^coxae and

femora

greenish, ^tibiae bark brown, with

more

or less metallic reflections;

knees, tipsoftibiae, and thetarsi testaceous; ^lastjoint of ^tarsi dark;

abdomen

_longerthan the head

and

thorax combined.

Mate.

Length

^about1.25

mm.

Similar tothefemale, but ^thetibse with

more

testaceous; joints 2-4 of funicle subequal ⁱⁿ length, the first shorter; pedicel about as long as the second joint of funicle;

sculpture of

propodeum more

^{indistinctthan infemale.}

Habitat: Reno, Nevada.

Type: ^Cat No. 14362, U.

^S.

National Museum.

From

a series

reared by Mr.

^{S. B.}

Doten

a

type female and

a

type male and

five

paratypes

^of

each sex have been

selected.

Mr. Doten

writes that in

cages the

^{larva? of this} parasite feed readily

on Habrobracon hebetor and on Mefaporus, and

^occa- sionally

on Pteromalus.

A PREOCCUPIED NAME IN SPHECOIDEA.

Notogonidea, new name.

Notogotiia

^Costa,

Ann.

tnus. zool.

Napoli

^vol.4,

1867 (1864)

p. 82; not

Notogonia

Perty,

Mitth. Naturf. Ges. Bern,

1850, p. 20.

Type: (Tachytcs nigm Van ^de Linden)

⁼

Larra _pompili- formis Panzer.

S.

A. ROHWEK.