AMERICAN DIPTERA. 351 



26. Woolly species ; scutellum with many bristles. . • -scatophagina sp. nov. 

 Less pubescent species ; sciitelluni with eight or fewer bristles 27 



27. Scutellum with six to eight bristles obesa Loew. 



Bristles of scutellum four or less ■ 2H. 



28. Pile of body luteous Aldrichii mihi. 



Pile of body white or wanting 29. 



29. Species devoid of hairs; wings clear hyaline, sixth vein evanescent. 



neoinexicana sp. nov. 



More or less pubescent species ; sixth vein normal 29a. 



29a. Scutellum with two bristles; dorsum of abdomen brown pollinose; legs of 



female ciliate with black scales captus Coquillett. 



Scutellum with four bristles 30. 



30. Stigma brown, wings gray, abdomen blue-gray pollinose. 



a vida Coquillett. 



Stigma wanting, abdomen more or less brownish above. 30a. 



30a. Antennae and proboscis yellow at base levicula Coquillett. 



Antennae and proboscis black vaginifer sp. nov. 



Einpis scatophagina sp. nov. 



Male. Length 9 mm.— Stout black species, densely clothed with mixed yellow 

 and dusky woolly pubescence, the darker hairs prevailing on the mesonotum. 

 Eyes contiguous; facets uniform. Face covered with brown-gray pollen. An- 

 tennae short, black, third joint lanceolate, one-third as wide as long, its style 

 two-thirds its length. Palpi porrect, ribbon-like, luteous, with a few long black 

 forward-extending hairs beneath. Proboscis slender, black, reaching to the 

 tip of the middle coxae. Occiput densely covered with dusky pubescence 

 above and with yellowish below. Thorax with four narrow glabrous vittae, the 

 outer pair abbreviated behind, densely covered with pubescence, the darker 

 hairs slightly longer and directed posteriorly, the lighter hairs shorter and 

 straighter, especially on the humeri where the dense yellow hairs extend for- 

 ward. Above the base of the wings and at the posterior end of the middle vittse 

 are bunches of black bristles; scutellum bearing about twenty bristles; meta- 

 pleurae with a dense mat of yellow hairs; pleurae cinereous dusted. Abdomen 

 cylindrical, stout, somewhat shining, with long dense yellow pubescence ; no ven- 

 tral projections; hypopygium comparatively small, outwardly fulvous, closed, 

 globose, its lower valve with a fringe of yellow hairs, central filament hidden, 

 except at base, middle lamellaj scarcely larger than upper ones. Coxae black, 

 dusted with gray and provided with yellow pubescence; middle and hind ones 

 with a row of longer black hairs along outer side; trochanters black, shining. 

 Legs dark castaneous. shining, not thickened, unarmed, provided with short 

 black bristles; tarsi piceous, black apically. Halteres yellow. Wings lightly 

 and evenly infumated, stigma faint, elongate and very narrow, veins narrow, 

 dark brown, normal, anterior branch of the third vein oblique and curved, dis- 

 cal cell two-thirds as long as the ultimate section of the fourth vein. 



Female. — Differs thus: eyes widely separated ; pubescence shorter; front and 

 hind edges of middle and hind femora ciliate with short black scale-like hairs ; 

 inner edge of hind tibiae likewise fringed, but not so densely. 



One male and one female. Sitka, Alaska, in the Loew collection 

 in the Museum of Comparative Zoology, Harvard University. 



TRANS. AM. ENT. SOC, XXVIII. SEPTKMBEK, 190'2. 



