122 Bulletin of the Brooklyn Entomological Society Vol. XV 



— Length of third antennal segment not as great or very 



slightly greater than height of cheek; abdomen cylin- 

 drical ; lower calyptra not distinctly protruded. ... 12 



4. Fifth abdominal sternite blackened, furnished with a 



fringe of long erect fine black hairs along the inner 

 margins of the processes; third antennal segment not 

 over twice as long as second; thorax and abdomen 

 yellowish testaceous, the latter with narrow dark pos- 

 terior margins to the tergites and with a faint dark 

 dorso-central vitta; third sternite about 1.5 as long 

 as wide luteola Malloch 



— Fifth abdominal sternite not as above ". 5 



5. Species entirely pale testaceous yellow, including anten- 



nae ; lower calyptra distinctly protruded ; hind tibia 

 with three anterodorsal bristles ; longest hairs on arista 

 a little longer than its basal diameter. . .unicolor Stein 



— Species not entirely pale yellowish testaceous, at least the 



third antennal segment darkened 6 



6. Hind femora and tibiae with exceptionally long bristles, 



the distal one on posterodorsal surface of tibia half 

 as long as tibia rufipes Fallen 



— Hind femora and tibiae with normal bristling, the distal 



one on tibiae not nearly half as long as the tibia .... 7 



7. Hind tibia with two anterodorsal bristles ; mesonotum 



entirely yellowish testaceous, or with a gray central 

 vitta '. II 



— Hind tibia with three anterodorsal bristles ; mesonotum 



largely or entirely fuscous 8 



8. Scutellum black ; processes of fifth sternite glossy brown- 



ish black, without hairs or bristles on outer surfaces, 

 each process with a clawlike spur on inner side near 

 apex, the base of which is on inner margin of process ; 

 basal segment of hypopygium with long bristly 

 hairs unguiculata Malloch 



— Scutellum largely yellowish; fifth sternite not as above. 9 



9. Palpi inf uscated apically ; anterior lateral angles of thorax 



and scutellum yellowish testaceous ; arista with its 

 longest hairs a little longer than its basal diameter ; 

 lower calyptra distinctly protruded ; scutellum almost 

 bare on disc ; posthumeral bristle not duplicated, the 

 area between posthumeral and margin of thorax 

 almost bare zvinthemi Meigen 



— Palpi entirely pale; posthumeral bristle duplicated. . . 10 

 10. Anterior lateral angles of thorax and scutellum testace- 

 ous ; tibial bristles strong, the posterodorsal surface of 



