286 Journal New York Entomological Society. [Voi. xxi. 



Wings hyaline, the second vein parallel with the costa, the anal angle 

 more or less evident 17. 



17. Two strong fronto-orbitals, in front of which is a smaller bristle, the 



hinder fronto-orbital behind the middle of the front ; postverticals 

 present ; mesonotum more or less pollinose and with acrostichal 

 setulae; face and cheeks relatively broad. (Europe, North America.) 



Anthomyza Fallen. 

 One strong fronto-orbital at the middle of the front, with a smaller bristle 

 before ; postverticals minute or wanting ; disc of mesonotum pol- 

 ished 18. 



18. Front opaque, the ocellar triangle not enlarged 19. 



Ocellar triangle enlarged, reaching nearly to the antennas, it and the frontal 



orbits descending to include the orbital bristle highly polished, thus 

 forming an M-shaped design on the front ; arista short-plumose ; two 

 strong dorsocentrals ; postverticals minute ; eyes large, the lower 

 facets enlarged, thus reducing the size of the face and cheeks. 

 (North America.) Mumetopia new genus. 



19. One dorsocentral ; face shining black; postverticals minute; arista plu- 



mose; wings long and narrow. (Europe.) Anagnota Becker. 



Two dorsocentrals ; face pruinose ; no postverticals ; a rounder head, more 

 elevated thorax, shorter and broader wings with the tip less rounded, 

 and shorter claws. (Europe.) Paranthomyza Czerny. 



20. Pubescent, without macrochastse, scutellum margined with fine bristles, 



cheeks broad and hairy ; front hairy, produced over the antennas as 



a subconical process. (Europe.) Selachops Wahlberg. 



Macrochaetas developed ; front not produced 21. 



21. But two postsutural dorsocentrals present; no vibrissa; the polished front 



with a broad transverse impression below the middle, and with two 

 fronto-orbitals ; no preapical tibial bristles ; costa not broken and not 



spinose. (North America.) Pseudodinia Coquillett. 



Dorsocentrals usually extending in front of suture; front neither trans- 

 versely grooved nor polished ; fracture of costa before the end of the 

 first vein usually distinct 22. 



22. Tibiae with preapical bristle ; costa bristly with short spines ; two fronto- 



orbitals ; two presutural dorsocentrals ; two or three sternopleurals. . 23. 

 Tibiae without preapical bristle ; costa not spinose ; vibrissa small or want- 

 ing; one sternopleural ; one presutural dorsocentral 24. 



23. Black species ; vibrissae large ; face vertical, below the epistome with an 



oral margin ; cheeks narrower than the eye-height ; antennas normal ; 

 front pollinose. (Europe, Asia, North America.) . Trixoscelis Rondani. 

 Yellow species, with yellow bristles ; vibrissae rather small ; face receding 

 below, without oral margin ; cheeks nearly as broad as the eye-height ; 

 antennae very small. (North America.) Zagonia Coquillett. 



24. Ovipositor lengthened, two times as long as another segment, but above 



deeply compressed, so that the lateral margins form narrow ridges ; 

 anal and second basal cells lacking ; two fronto-orbitals ; one row 

 only of acrostichals. 1.8 mm. (Europe.) Psendopomyza Strobl. 



