FUNGUS GNATS OF NORTH AMERICA. 12/ 



dd. The media forks at least the length of the crossvein be- 

 yond the latter and distad of the fork of the cubitus, 

 e. Ocelli widely separated, the middle one distinct and 

 but little if any smaller than the laterals, 

 f. The subcostal crossvein placed noticeably proximad of 

 the cell Rj^ which is three or more times as long as 

 broad, and the subcosta ends in the costa; conspicu- 

 our hairs on the wing among the setulse (fig. 87). 



5. Paratinia. 

 ff. Not with the above combination of characters. 



g. R^^- much curved and often undulate, cell 'R.^ usually 

 shorter than broad, subcosta ends either free or in 

 the costa beyond the cell R^ (figs. 88-90). 



6. Polylepta. 

 gg. Rj^. straight or gently arched ; the cell R^ as long 



or longer than broad (except in Empalia). 

 h. Subcostal crossvein is proximad of the small cell 

 R^ which is shorter than broad (fig. 91) ; apex of 

 subcosta may be obliterated. 7. Empalia. 



hh. Subcostal crossvein, when present, is placed on the 

 cell Ri. 

 i. Subcostal vein ends in R^, ; small cell usually more 

 than twice as long as broad ; petiole of the cubi- 

 tus rather short; middle femur of male without 

 a stout spine at apex. 

 j. Proboscis prolonged, snout-like (fig. 61, pt. i) ; 

 anterior veins unusually heavy (fig. 93). 



8. Hadroncnra. 

 jj. Proboscis not prolonged: anterior veins only 

 moderatcl}- thickened (fig. 92). 



9. D::icdzickia. 

 ii. Subcostal vein ends in the costa, small cell less 

 than twice as long as broad ; wing with mark- 

 ings (fig. 94) ; apex of middle femur of male 

 with a stout spine. 10. Diomoniis. 



ee.' Ocelli close together, the middle one if present very 

 minute, 

 f. Wing with l)ands or markings ; costa usually produced 

 beyond the tip of R4+- ; wing usually with a longi- 



