260 A. L. Mi:i>ANI)KK. 



with a forked Lliini V(;in ; discul <'.t;Il pro.seiit, emitting three veins to 

 tile niiir<(in ; anal eell l()ng(!r tiian the second hsisal ; anal angle gone. 



Aritciiiiie yellow, third ji)iiit brown ; ;il)(lonicn yellow, with dorsal dark spots. 



robortNOiiii (Nxjiiillett. 

 Anti'imte piceous; abdomen dark fuscous occidenlalis sp. nov. 



UracliyNtoiiia robertriionii Coquillett. 

 I'roc. Nat. Mus., ]»'.)r,, p. '.'.'Xi. 



Head black, gray pollinose; face naked, scarcely half as wide as the front; an- 

 tennse yellow, the third joint, excei)t at the base and style, brown; the third 

 Joint lanceolate, scarcely twice as long as broad, twice as lonp as the second ; 

 style curved, one-third longer than the third, joint; i)roboscis yellow, i)alpi whit- 

 ish. Thora.\- very shining black ; pleura blackish, opaque light gray pollinose; 

 inetanotum and scutcllun) the same, the latter bearing two bristles. Abdomen 

 compressed, shining, yellowish, a large dorsal black sjjot on each segment; hypo- 

 pygium large, ascending, each ui)pei' lamella |)roduced at the outer angles into a 

 |)air of long, erect, cylindrical, brown processes; middle lamelke very large, each 

 bearing at its tip a rather large curved jirocess, in front of which is a small pilose 

 tubercle, while behind it is a smaller tubercle bearing a few long whitish bris- 

 tles; the inner side of each lamella bears a long, cylindrical, brown-tii)ped pro- 

 cess; filament slender, arcuate, proceeding from apex of the rather large lower 

 lamella. Legs including the coxaj yellow; front and hind femora slender, the 

 middle nearly twice as thick as the front ones, their upper side thickly beset with 

 very short black spines and with longer black bristles; inner side of middle 

 tibiae also thickly beset with very short black spines. Halteres yellow. Wings 

 nearly hyaline, stigma wanting, first basal cell sliglitly longer than the anal, 

 which is a trifie longer than the second basal. 4 mm. 



Illinois, Tennessee, Ohio. 



ItracliyNtoma o<rci<l«iitaliN sp. nov. (Fig. 89). 

 Mdle and FeimUe. Length 4 mm. — Head and thorax black, abdomen fuscous. 

 Face extremely narrow, gray (femalej, obliterated in the male; front moderately 

 narrow, black ; vertex and occiput shining. Antenna; equal to head, piceous, 

 third joint subequal to first one, arista white, equalling antenna. Palpi white, 

 proboscis yellow. Thorax shining, humeral callosity more or less fuscous; a pre- 

 alar but no scutellar long bristles; pleur* a little dusted with gray ; halteres yel- 

 lowish. Abdomen twice as long as thorax, fusco-piceous ; of the female com- 

 pressed in all the (dried) sjjecimens, but the terminal segment greatly enlarged, 

 ballocm-like. The enlargement is sometimes translucent yellow bronzed. Abdo- 

 men of the male yellowish at the base, black apically, the hypopygium small, 

 terminal, the upper lamellas small, elongate, slender, the outer extremity niiform, 

 the middle lamelUe moderate in size, the outer side excised, from the emargina- 

 tion of which arises a slender filiform appendage, the central filament slender, its 

 base moderately thickened, strongly arcuate, and suddenly recurved near the 

 tip. Legs slender, yellow, upper side of four posterior femora, all tibia- and tarsi 

 brownish ; no setuhe i)resent. Wings unifotmly lightly infumated, veins fuscous, 

 third vein forked, submarginal cell not closed, basal cells equal, anal cell a little 

 longer, its cross-vein curved, no anal angle. 



Numerous specimens; Washington, Idaho (J. M. Aldrich). 



