AMERICAN DIPTERA. 307 



Einpis varipes Loew. 

 Cent, i, 34. 



Male and Female. — Huuch-backed. Heart, thorax and scutelluiti cinereous, 

 opaque. Proboscis longer than tlie head, hiteous, stripes of the labium black. 

 I'"'irst two joints of the antennae dark brown, the third black. Thorax black- 

 pilose. Abdomen black, very shining, sparsely provided with very fine pale 

 pile, the base and venter luteous. Hypopygium of the male very small, dipjiing 

 down, black, the central filament low and slightly curved. Front coxse luteous, 

 the others grayish brown. Legs luteous, a very broad subapical ring on the pos- 

 terior femora black, a very broad subbasal ring on the bind tibite fuscous, some- 

 times wanting, the apex of all the tibise fuscous; all the femora below with small 

 black spines. Halteres white. Wings of the male longer than those of the 

 female, whitish, veins concolorous, but the second section of the costa and the 

 apex of the third longitudinal blackish ; wings of the female pure hyaline, not 

 whitish, with a very faint cinerascent tint, veins fuscous. 3 mm. 



Pennsylvania (Osten Sacken). 



Kinpis levicula Coquillett. 

 Proc. Nat. Mus., 1895, p. 406. 



Male. Head black, bluish gray poUinose, eyes contiguous; antennae black, the 

 two basal joints yellow, style over one-half as long as the third joint; proboscis 

 yellowish, black at the apex, over three times as long as the height of the head, 

 palpi yellow. Thorax, pleura and scutellum black, opaque gray pollinose ; thorax 

 with four brown vittse, its sparse pile and bristles black ; pile of pleura white, 

 scutellum bearing four bristles, the two outer very short. Abdomen black, 

 opaque brown pollinose, its spai'se pile white; hypopygium small, the filament 

 bidden. Legs slender, destitute of long bristles, dark yellowish, including the 

 coxae; the tarsi toward the apex black ; front metatarsi nearly as long, but only 

 about half as thick as the hind ones. Wings whitish hyaline, veins brownish, 

 stigma wanting. Halteres yellow. 



Female. — Same as the male, except that the thorax and abdomen are wholly 

 bluish white pollinose. 6-7 mm. 



Illinois (Robertson). 



Einpis avida Coquillett. 

 Proc. Nat. Mus., 1895, p. 405. 



Female. — Head black, bluish gray pollinose; antennae brown on the two basal 

 joints, the third joint black, short, broad, tapering gradually to the tip, style over 

 one-half as long as the third joint ; proboscis three times as long as the height of 

 the head, palpi yellow. Thorax, pleura and scutellum black, opaque, bluish gray 

 pollinose ; thorax marked with four blackish brown vittae, its pile rather dense, 

 but quite short, black ; pile in front of halteres white, abundant, fine; scutellum 

 bearing four bristles. Abdomen black, opaque, light bluish gray pollinose, its 

 pile white, that on sides near the base abundant, long; no fringe of long black 

 bristles near the hind margins of any of the segments. Legs slender, simple, 

 femora destitute of long bristles; coxae brownish yellow, the hind ones largely 

 blackish; femora, tibiae and tarsi brownish yellow, apices of tarsal joints and last 

 joint wholly blackish ; middle metatarsi scarcely thicker than the front ones, 



TRANS. AM. ENT. SOC, XXVIII. SEPTEMBER, 1902. 



