A NEW TRIGONALID FROM INDIA (HYM).

PROC. ENT.

SOC.

WASH., VOL.

22,

NO.

_J, OCT.,

IQ2O

¹⁹¹

A NEW TRIGONALID FROM INDIA (HYM).

BY

T. D. A. COCKERELL.

Some _{time ago} Mr. Ramakrishna Ayyar

^sent

me from India an

insect

which

I

took

atfirstsight to

be

a

bee

ofthe

genus Xomada.

Closer

_inspection

showed that

the

resemblance was _wholly

_super-

ficial,

and

I

had

before

me

^a

member

of the Trigonalidae. ^I

was not then

able to

do more than

ascertain

that

^it

was

at leastclosely allied to Poecilogonalos ^thwaitesii

(Westwood),

^described

from Ceylon. Coming

^to

Washington, ^with

^{the assistance of}

Mr.

S.

A. Rohwer and some

additional literature, ^I

have been

able to separate ^it

from

all

known

forms,

and

it is

accordingly

^de- scribed.

Poecilogonalos

mimus, new

species.

Female. -Length about 9

mm.;

^anteriorwing 7.5

mm.;

^{similar in} general characterand appearance^toP.thwaitesii,but ground^{color of}headandthorax mainly black, clypeus only very ^shallowly and broadly subemarginate, no medianfrontal spot,scutellum yellow with^amedianferruginous

band

(axillae red), and second abdominal segment with the yellow confined to the broad apical band.

The

insectactually^falls nearertoP.formosana ^Bischofffrom Formosa, apparently agreeingⁱⁿthe rather coarse sculpture^{of the} headand thorax, and in the clypeus beingwithout a triangular emargination, ^{as well} as in the lack of the basal yellow spot on second abdominal _segment. It differs, however, ⁱⁿ the colorationofthe scutellum, and inthedarkcloudon the wings being confined ^to the apical half of the marginal ^cell (extending on the lower part as far as middle of third submarginal) and a broad aiea belowthe marginal beyond ^thethird submarginal.

The

secondsubmarginal

cell is considerably longer than ⁱⁿ Westwood's _figure of P. thwaitesii, and the firstrecurrent nervure meets the first transversocubital, a ^trifle toward the outerside.

Head

transverse,thebroad mandibles_yellow,withfourblack_teeth;clypeus with two large subcircular yellow spots, separated

by

^{a reddish band; an-}

teriorand posterior orbits with broad yellow bands, the anterior one ending abruptly (broadly truncate) ^atabout the beginning ^of the upper ^two-fifths of orbit; a pair ofsubtriangularyellow spotslow

down

onfront;scapeswollen, ferruginous;flagellum longand _slender, blackened above, belowred with the sutures narrowly black; front withthin white hair; vertex _closely punctured but _shining; the _posterior yellow band of cheeks, failing on _occiput, emits

two

ferruginousbands whichconverge^totopof eye,enclosing^ablacktriangle,

and

below this isanother blacktrianglebehind the _eye;thorax aboverather coarsely punctured, the scutellum rugosopunctate and dull; sides and hind partof mesothoraxferruginous; the two wedge-shaped ^{anterioryellow} marks

on

mesothorax as in P. thwaitesii; postscutellum yellow with an _oblique blackbanddividingtheyellowoneachside;lower part^ofmetathoraxbroadly

PROC. ENT.

soc.

WASH., VOL.

22,

NO.

_{7, OCT.,}

1920

yellow; acurved_yellow

band

on_prothoraxbelow tegulae,andanother band on_{lower part}ofprothoraxanteriorly;mesopleura with^aroundred spotbelow the wings, and anelongate yellow

mark

posteriorly lowerdown; metapleura witha slender yellowmark;coxae yellow, the hind_pair only ^so posteriorly, otheiwise black; tiochanters _{pale yellowish;} femora, tibiae and tarsi light ferruginous, the tarsi blackened on last joint; tegulae light ferruginous;

wings clear, with dark piceous stigma and nervures, and cloud on anterior wings ^as already described;

abdomen

robust, finely punctured; ^first tergite with a _large,

somewhat

T-shaped median yellow area, second with a very broad _{apical band,} third ferruginous apically, with an obscure interrupted yellowband; ^theothersegments mainlyyellowwitha medianpiceous band, asinP.thwaitesii', firststernitewithaverybroadyellow band,butthemargin hyaline; second with^{a still} broader band, interruptedⁱⁿmiddle.

Pulney

^Hill,

South

India,

3-6,000

^feet altitude,

May 10-31 1917

(P. S.

Nathan). Ramakrishna Ayyar ^No.

3.

Type. Cat. No. _{23451, U.}

S.

N. M.

ActualDate _ofpublication, October 30, 1920.