266 A. L. MELANDER. 



black, almost shining, witb sparse black pile. Legs black, with short black pile, 

 the tips of the knees yellow. Halteres black. Wings dark cinereous, stigma 

 black. 2.2 mm. 



Illinois (Le Baron). 



Hilara brevipila Loew. 

 Cent, ii, 41. 



Black, subopaque. Head black, the occiput cinerascent, with whitish pollen. 

 Antennae black. Palpi yellowish. Proboscis shorter than the head. Thoracic 

 dorsum subcinerasceiit, with fine white pollen, with two faint approximated 

 blacker vittse, and clothed with short blackish pile. Scutelluni same color as the 

 thorax. Abdomen black, almost shining, very faintly cinereo-pollinose, black 

 pilose. Legs black, the knees yellowish, the pile short and black, the tibise and 

 metatarsi of the front and hind legs provided with a little longer pile above, an- 

 terior metatarsi of the male incrassate. Halteres black. Wings hyaline, stigma 

 dark fuscous. 4.2 mm. 



Illinois (Le Baron), 



Hilara atra Loew. 

 Cent, ii, 42. 



Black, shining. Head black, black-pilose, antennse and palpi black; proboscis 

 shorter than the head. Thoracic dorsum black, shining, very slightly cinereous- 

 pruinose, clothed with rather long black pile. Scutellum same color as the 

 thorax. Abdomen black, shining, black-pilose, the somewhat lengthened hypo- 

 pygium concolorous. Halteres black. Legs wholly black, with short black pile, 

 the front tibiae and the front metatarsi of the male strongly thickened, bearing 

 rather long pile above. Wings subcinerascent, stigma almost black. 2.2 mm. 



Illinois (Le Baron), Massachusetts, Colorado, N. Mex. 



Hilara leucoptera Loew. 

 Cent, ii, 43. 



Black, moderately shining. Head black, occiput cinerascent, with whitish 

 pollen. Antennse black, the first two joints blackish brown. Palpi black. 

 Proboscis a little longer than the head. Dorsum of the thorax subcinerascent, 

 with fine whitish pollen, bearing blackish pile. Scutellum concolorous with the 

 thorax. Abdomen black. Legs fuscous, in mature specimens almost black, 

 knees dirty white. Halteres whitish. Wings hyaline, whitish, anterior veins 

 pale yellowish, remaining veins dull whitish, stigma very weak ; anterior branch 

 of the third vein sharply ascending ; second submarginal cell very short. 2.5 mm. 



Florida (Osten Sacken). 



Hilara gracilis Loew. 

 Cent, ii, 44. 



Head black, occiput cinereous. Antennse black. Palpi yellowish. Proboscis 

 about equal to the head. Thorax cinereous, not vittate, opaque, clothed with 

 black pile. Scutellum the same color as the thorax. Abdomen black, moder- 

 ately shining, black-pilose, faintly cinereo-pollinose. Legs testaceous or slightly 

 fuscous; tibiae fuscous, the base of the anterior ones, however, often testaceous; 



