NORTH AMEUICAN DIPTERA. 107 



24. — Knob of halteres yellow, scales of abdomen brown, hind mar<'iii of sciitel- 



liim opaque cerviiiiiis Loew. 



Knob of halteies black, scales of abdomen brown and white, bind margin 



of scutelliun shining <*oiiiiriiM O. S. 



2.5. — Face much retreating below, its pile deep golden -yellow oapa.x Coq. 



Face not retreating, its pile never deep golden-yellow 29. 



26.— Pile of front partly black 27. 



Pile of front wholly white or yellowish, hind margin of .scutellum o]>aqne 



and scaly 28. 



27. — Hind margin of scutellum bare and shining truiisituN Coq. 



Hind margin of scutellum opaque and scaly. fiiiuosiis Coq. 



28. — Styliform portion of third antennal joint not longer than the thickened 



basal part, second basal cell almost hyaline riiinidiiM Coq. 



Styliform portion nearly twice as long as the basal portion, sec'ond liasal cell 



distinctly brown fiicatiiM n. sp. 



29. — Scutellum and thorax destitute of bristles pcIliK'idiiS Coq. 



Scutellum aiul thora.x bristly leviculll!^ ii. sp. 



Aplioebaiitiis caliilus n. .sp. 'J,.— Black, the halteres yellow. Pile ami 

 bristles of head, body and legs white or yellowish, the scales also white or yel- 

 lowish, except a broad stripe of largely black scales in the middle of dorsum of 

 abdomen, sometimes reduced to a row of spots, one to each of the segments two 

 to five: styliform portion of third antennal joint nearly twice as long as the 

 thickened basal part, face greatly retreating below, proboscis not projecting: 

 scutellum rounded behind, bristly, shining, the margin destitute of scales : hind 

 femora with numerous long hairs, and sometimes a few bristles below. Wings 

 pure hyaline, apical two-thirds of subcostal cell yellow. Length 5-9 mm. 



Southern Culiforniu. Eleven specimens, in April and May. 



.4phcebaiifn<<» viilpeonla n. s]). % J.— Same -ds cat nlus w\th these ex- 

 ceptions: Til>ue and l)ase of tarsi sometimes yellow^; black scales ou abdomen 

 forming a transverse pair of spots on each of the segments two to four, a!id some- 

 times on five and six : styliform portion of third antennal joint scarcely longer 

 than the thickened basal part; proboscis slightly projecting beyond the epistoma: 

 hind femora with several short bristles, l)ut no long hairs below. Length (> mm. 



Southern California. Three niale.s and three females, in April and 

 May, 



Apli<el»aiiiliM leviciiliis n. sp. % 9 -—Same as cuMus, except the follow- 

 ing: Tibiic and bvise of tarsi sometimes yellow: abdomen destitute of black 

 scales: styliform portion of third antennal joint only as long as the thickened 

 basal part; face not retreating below, almost perpendicular; hind margin of 

 scutellum scaly: hind femora with a few bristles, but no long hairs l)elow. 

 Length 4-6 mm. 



Southern California. Five males and five females, in April and 

 May. 



TEANS. AM. ENT. SOC. XXI. MARCH, 1894. 



