FUNGUS GNATS OF NORTH AMERICA. I35 



ee. Dorsal plate of hypopygium slightly emar- 

 ginate, with 2 long, slightly and sparsely 

 plumose setae (similar to fig. 117) ; su- 

 perior forceps not produced beyond the 

 margin of the dorsal plate; inferior for- 

 ceps with 3 long blunt spines (similar to 

 fig. 119s) ; abdomen subfuscous, nearly 

 imicolored. 5. in call id a n. sp. 



dd. Subcostal crossvein inserted at the middle of 

 small cell R^. i. quadrafula. 



cc. Thorax mainly dark. 



d. Superior forceps curved, large, broadened at 

 the end (fig. 113a), inferior forceps with 2 

 dorsal spines and i very strong ventral, lat- 

 erally directed spine (fig. 113b). 



6. hebes n. sp. 

 dd. Superior forceps hidden ; no strong spine on 

 ventral surface of inferior forceps, 

 e. With 3 blunt spines (s) on dorsal lobe of 

 inferior forceps (fig. 119). 



/.• noTafa n. sp. 



ee. With 2 blunt spines (s) on dorsal lobe of 



inferior forceps (fig. 116). 



f. Margin of dorsal plate of hypopygium 



with 8 to 10 slightly plumose setae, 



sometimes directed inwards ; dorsal 



lobe of inferior forceps with its 2 



blunt spines, strongly developed (fig. 



ii6s). Western species. 



8. iinpar. n. sp. 

 ff. Margin of dorsal plate with fewer plu- 

 mose setae. 



g. Thorax fuscous, pleura brownish ; 

 margin of dorsal plate of hypo- 

 pygium with no plumose setae. 



9. scvcra n. sp. 

 ^g. Pleura blackish ; margin of dorsal 



plate with 2 sparsely plumose 

 setae (similar to fig. ii/s), (com- 

 pare 13 hirta Meigen and Poly- 

 Icpia grisca Walker). 



10. pallipcs Say. 



