126 Bulletin of the Brooklyn Entomological Society Vol. XV 



31. Parafacial in profile much wider than third antennal seg- 



ment, at base of antennae ; prealar bristle half as long 

 as the bristle behind it ; the extra posthumeral bristle 

 very long 32 



— Parafacial at base of antenna not as wide as third an- 



tennal segment ; prealar bristle less than half as long 

 as the one behind it 33 



32. Processes of fifth sternite not flattened, glossy, bare at 



apices jacohi Malloch 



— ■ Processes of fifth sternite flattened, glossy, and armed 

 with setulose hairs at apices ; mid tibia with an an- 

 terior bristle vanduzeei Malloch 



33. Hind femur with a series of short, stout, rather closely 



placed bristles on basal half of posteroventral surface ; 

 fifth sternite with dense, erect, stiff black hairs on 

 inner half of each process pedestris Malloch 



— Hind femur with a number of long, widely placed bristles 



on basal half of posteroventral surface ; fifth sternite 

 with dense, erect hairs near base of each process . . 34 



34. Palpi and antennae black ; processes of fifth sternite bare 



af apices fringilla Malloch 



— • Palpi and second antennal segment rufous ; processes of 

 fifth sternite with a number of short stiff setulse at 

 apices vanduzeei Malloch 



35. Hypopygium very large; third antennal segment not 



twice as long as second ; hind tibia with three antero- 



dorsal bristles ruhivora Coquillett 



— • Hypopygium small or moderate in size; hind tibia with 

 two anterodorsal bristles 36 



36. Deep black species, with very faint grayish pruinescence 



on thorax, the abdomen densely drab-gray pruines- 

 cent ; prealar one third as long as the bristle behind 

 it littoralis sp. n. 



— Black species, with dense whitish gray pruinescence on 



both thorax and abdomen; prealar bristle absent or 

 minute slossonce sp. n. 



Pegomyia acutipennis Malloch. 



Stein has erected a genus Enneastigma for the reception of a 

 species which very closely resembles this one. The only character 

 which he cites for the separation of the genus from its allies is 

 the tripunctate abdomen. In view of the fact that there does not 

 appear to be any real structural character for the separation of 

 acutipennis from the other species in the group in the foregoing 



