an eastern chilosia with hairy eyes.

168 PROCEEDINGS ENTOMOLOGICAL SOCIETY

AN EASTERN CHILOSIA WITH HAIRY EYES.

(Diptera, Syrphidce.}

BY

R. C.

SHANNON, Bureau

ofEntomology.

Chilosia primoveris,

new

species.

Male:

Robust

species; shining, dark metallic green.

Eyes

hairy; ver- texwith _longlight colored hairswith black ones intermixed; frontal ^tri- anglewith _{long erect}black hairs

and

a furrow running

down

the middle;

first

two

antennal _joints deep ^reddish brown, ^{the third} a shade _lighter;

arista concolorous with the third joint

and

with microscopic pubescence on basal third. Face with _light colored hairs

and

_very fine pubescence, the tubercle distinctly nearertheoral

margin

^{thantobaseofantennae}

and

projecting ^far

beyond

^latter.

Dorsum

of thorax with rather long

and

densewhitish _pile

and

meso- pleurawith_longblackhairs;post-alarcallositieswithfinelong black

and

whitish hairsin tufts;scutellumcovered withlong whitishpile likethaton

mesonotum and

withafewcoarserblack oryellow^onesonthemargin.

Abdomen

_slightlynarrower thanthorax, shining dark metallic green, with rather thickwhite _pile.

All the femora black, their _tips brownish-yellow, ^tibise yellow, with broad black_rings around themiddle;^tarsi onouterside

more

black than yellow,on undersidelargely yellow.

Wings

^tintedwithyellow, their bases^dull

brown which

merges^intoyel- low asitspreads outover_{the wings.} Spurious vein

weak;

^{lastsection of} fourth vein with

two

angulations

which

_{have very} shoirt

stumps

^{at their} apices; the second_spur,

which

projects into the ^first posterior cell, some- times obsolete, the part ^ofthevein

beyond

^{this last} broadly curved^out- ward. Length: ^6-8

mm.; wing

^6-7.5

mm.

Female: Frons narrowerthan oneeye, narrowing towards vortex, with abroadtransverse depression a short distanceaboveantennas

and

a

weak

longitudinal groove running from ^{ocelli to} the depression; frons clothed with _lightyellow ^erect pile

which

is longer ⁱⁿthe ocellar region. Facial tubercle

more

prominent than ^inthemale.

Mesonotum

with

some

coarser hairs scattered through the light pile.

Mesopleura? with light pile.

Abdomen

broader than thorax

and

with shorter pile than in the male.

Lastsectionoffourthveinwith onlyslighttrace ofthesecondangulation,

and

_rarelywith traceofstump.

Length

^5-7

mm.; wing

^5-7

mm.

Type

locality:

Plummers

_Island,

Md.

(Male type, April 16, female allotype April25, 1915, R. C. S. coll.)

Type

^{Cat. No.} 19786, U. S. N.

M.

Described from 45 specimens; paratypes from

Plummers

_Island,

Md.

opposite

Plummers

Island,

Cabin John and

Great _Falls,

Md.; Dead Run,

Fairfax _{Co., Va.,} April^7-25. (R. C. Shannon, ^J. C. Crawford,

and W.

L.

McAtee,

collectors).

This _species runs to C. petulca ⁱⁿ the table in Williston's Synopsis of the

North American

_Syrphidse. In comparison with ^the type ^{of that} species^{it is}smaller,

more

_robust,

and

darkershining metallic green.

The

arista ofpetulcaislonger

and

withdistinctpubescence^{to the}tip;^all three antennal _joints are

more

yellow; the frons ^is yellow ^atbase of antenna}.

The body

pubescence^ofpetulca^isvery^short

and

thinly scattered, the hairs on thescutellarmarginstronger, shorter

and

black.

The

wings^ofpetulca are comparatively longer; the last section of the fourth vein is

much

nearer the wing

margin and

^runsnearly parallel with it. Its legs are of a

more

uniform color.

Actual_{date of}publication,September18, 1915.