DESCRIPTION OF A NEW SPECIES OF AGROMYZA FROM PORTO

OF WASHINGTON, VOLUME

_XVI, 1914

89

DESCRIPTION OF A NEW SPECIES OF AGROMYZA FROM PORTO

RICO.

BY

J. R.

MALLOCH.

Agromyza

insequalis ^n. sp.

Mole: Black. Frons opaque, brown-black on center _{stripe, shining-} blackonfrontal triangleand_orbits,theformersubtriangularandn<.t reach- ing tomiddleoffrons;viewed fromtheside the frontal_stripeshowsslighl signs ^of whitish pollen; the frontal lunule ^is _distinctly white pollinoseas seen

from

_above; antennae black, ^arista concolorous; proboscis yell..^\\

Hi

atapex, palpi black; cheeks_black;

mesonotum

rather glossy black, with ^a slight bluish tinge; pleurae

and

scutellum concolorous, the former very slightlywhitish_pollinose.

Abdomen

glossy black,withavery decidedblue- green^luster. Legs wholly^black. Squamaewhitish yellow,fringeconcolor- ous.

Wings

clear, veins black. Halteres whitish yellow, the stalk yellow.

Fig. ^1.

Agromyza

incequalis n. sp.

Frons_slightly over one-third the width of head, veryslightlyconverg- inganteriorily;orbits_distinct,eachslightly lessthanhalf aswide asfron- tal stripe; four pairs ^{oforbital bristles} present, the upper one ⁱⁿalmost transverse ^line withthe anterior angle ^of frontal_triangle, very weak, the second about twice as long

and

_very strong, the third

much

weaker, but

still stronger than the upper, and the anterior pair ^of about the

same

strength as the upper, orposterior, pair;afew weak,scattered hairs present onorbitsbetweenthebristles

and

theeye margin;vertical bristlesstrong;

antennaemoderate in_size, situated about middle ofhead in_profile, third jointrounded, ^thepubescence very short; ^aristathickened atbase, taper- ing,^itslengthequal^tofromitsbasetotheupperorbital bristle,pubescence veryindistinct;cheek very^shortand narrow,^lessthanone-sixth the height ofeye and almost^ashighas long;marginal^bristlesdistmet but not

numer-

90 PROCEEDINGS ENTOMOLOGICAL SOCIETY

ous; vibrissa well differentiated; face in profile slightlyretreating,

mouth margin

not produced;

mesonotum

with

two

_pairsofstrong dorso-centrals, the anterior pairplaced ^farforward, generally about three-fourths ofthe distance tothe suture; sometimes thereis a setula anterior tothis bristle butit cannot beconsideredas a dorso-central; the pair^ofbristles

between

the posterior dorso-centrals^is distinctbutrather

weak;

^discalhairsweak, but numerous, aboutten totwelverows

between

the dorso-centrals.

Abdo- men

ovate, taperingtowards apex;surface hairs

numerous

but notbristle- like;

hypopygium

small; legs rather stout; mid-tibia with the posterior bristles welldeveloped

and

rather closely placed, theupper onedistinctly the_longest.

Wings

^asfigure.

Length

^2to2.5

mm.

Female: Similar to the

male

in all particulars except ^the ovipositor whichisrathershort

and

ofthe

normal

_form, notprojecting further than the length ^{of last} abdominal segment.

Type-locality:

Rio

_Piedras,

Porto

_Rico,

December

_2,

1913

(T.

H.

_Jones),

Porto Rico Sugar ^Growers'

Association,

Accession No.

_{983, 1913.}

Three males and one

female.

Reared from Vigna repens

(?).

Type: Male, deposited

ⁱⁿ

U.

S.

National Museum, Washing-

ton,

D.

C.

This

_species will

run down

to viridula

Coq.

ⁱⁿ

^the synoptic

^{table of this}

genus

ⁱⁿ

my ^recent paper

ⁱⁿ

^the Annals

of

the Entomological Society

^of

America, but the very marked

difference in

the

sizeof

the

orbitalbristles

should

_readily

separate

it

from that

_species,

and

also

from

dubitata

Malloch, which

italso

resembles very

closely.

In

_general

appearance

^this species ^re-

sembles

_closely

the

_species

belonging

^to

the

virens

group, but the

pale halteres

may ^be

readily

used

as

a means

for separation.

FOUR NEW SPECIES OF TACHINID^ FROM NORTH AMERICA.

BY W.

R.

WALTON, Bureau

ofEntomology.

PoLYCHiETONEURA new

_genus.

Body

^with true macrochsetse, palpinormal, proboscis shortfleshy, fir^t, third

and

fifthveins all bearingclosely^set blacksetulaefor atleasttwo- thirds their lengths. Ocellar bristles presentnormal,^facialridges bristly on lowest fifth only. Arista pubescent, second joint slightly longerthan broad. Apical ^cell entering costa at extreme _tip of wing, fourth vein roundedin acircle oflarge radius, posterior cross veinstraight, approxi-

mating

90 degreesof angle, entering fourth vein

midway

^{to bend. Costal}

spine small.

Head much

shorter at vibrissse than at base of antennae.

Face

on

lower half of sides,bare. Third antennal_jointbroad,roundedat apex.

Eyes

^{offemale bare.}

Abdomen

ovate, legs short.