308 A. L. MELANDER. 



hind metatarsi nearly twice as thick but scarcely longer than the front ones. 

 Knob of haiteres yellowish white. Wings grayish hyaline, stigma and veins 

 dark brown, no long bristle on costa near its base. 7 mm. 



Illinois (Rohertson). 



Einpis ooniantis Coquillett. 

 Proc. Nat. Mus., 1895, p. 402. 



Male. — Black; apex of palpi, proboscis, except the base and tiie lower lip, 

 femora, except a large portion of the under side, tibise and tarsi, except at apex, 

 yellowish red. First antennal joint twice as long as the second ; the third one 

 and one-half times as long as the first; style slender, as long as the third joint; 

 frontal triangle naked ; eyes narrowly separated ; proboscis three times as long 

 as the height of the head. Thorax opaque gray pollinose, marked with four 

 blackish vittae, thickly white and black pilose, the bristles black; pile at each 

 end of pleura, on coxae and abdomen mixed black and white; that on venter and 

 sides of abdomen abundant, white. Scutellum white pollinose, and bearing 

 twelve marginal black bristles. Abdomen shining, nearly destitute of pollen ; 

 hypopygium large, ascending; central filament largely yellow, double, free, arcu- 

 ate. Legs simple, femora thickened, the hind ones over twice as thick as their 

 tibiae; pile and bristles of femora rather numerous and long. Wings slightly 

 brownish, stigma and a spot above base of second vein, dark brown, anterior 

 branch of third vein very oblique and much curved. 9 mm. 



Northern California (O. T. Baron). 

 The knobs of the haiteres are black. 



Enipis brachysoiua Coquillett. 

 Proc. Wash. Acad., 1901, p. 409. 



Black, the palpi, horny portion of proboscis, stems of haiteres, femora and 

 tibite yellow, front and hind femora in both sexes and hind tibiae in the male, 

 yellowish brown, coxae brown basally, changing into yellow at their apices, tarsi 

 and knobs of haiteres dark brown, apex of male abdomen marked with yellow ; 

 eyes of male contiguous, third joint of antennae rather broad at base, quite 

 rapidly tapering to the apex, about twice as long as the style, proboscis twice as 

 long as height of head ; hairs and bristles of mesonotum black, hairs of pleura 

 and abdomen white; thorax opaque, gray pruinose, mesonotum marked with 

 four slightly polished, black vittae, scutellum bearing from four to six black bris- 

 tles ; abdomen of male polished black in middle of dorsum, the sides opaque, 

 gray pruinose ; in the female the dorsum of segments two to four, and all of ab- 

 domen beyond fifth segment polished black, remainder of abdomei) opaque, gray 

 pruinose; hypopygium of male rather small, obliquely ascending, claspers desti- 

 tute of processes, dorsal piece with a broad emargination in the posterior end 

 almost reaching its center, central filament hidden, venter destitute of processes 

 and of spinous bristles; legs of male simple, femora destitute of bristles and long 

 hairs; first joint of hind tarsi noticeably thicker than that of the front ones; 

 legs of female ciliate with nearly erect scales on both sides of the hind femora 

 and tibife, middle femora, and apical half of upper side of the front femora; 

 wings unusually long and narrow, grayish hyaline, stigma and veins, except at 

 base of wing, dark brown, venation normal. 7 mm. 



Alaska. 



