INSECUTOR INSCITI^ MENSTRUUS 121 



7. Prosternal bristles present No species in America 



No prosternal bristles 8 



8. Foremost fronto-orbital bristle absent; hind one very small; 



arista very long (humeral, propleural, sternopleural and hind 



supra-alar absent) Porsenus Darlington 



Not such 9 



9. Pteropleura hairy, often with a bristle; scutellum not hairy; 



arista only microscopically pubescent ; foremost fronto-orbital 



bristle usually present, hairlike or small Pseudoleria Garrett 



Not such 10 



10. Mid tibia with two pre-apical bristles 11 



Mid tibia with one pre-apical bristle 12 



11. Mid tibia with two or three spines near the middle, 



Oecothea HalHday 

 Hind femora with two or three irregular rows of spines on the 

 outside ; eyes small ; arista very long Bccoptomera Loew 



12. Mid tibia with only one long apical spur and two short ones ; 



tarsi not conspicuously spurred (tarsus 4 elongate; tarsi long, 



as deep as broad) Allophyla Loew 



Mid tibia with several long apical spurs 13 



13. Only one fronto-orbital bristle (arista usually plumose ; wings 



usually infuscated ; scutellum except in one or two species 



with one or many hairs) Heloniysa Fallen 



Usually two fronto-orbital bristles ; male with a comb or clus- 

 ter of spines on the inside of the hind femora; scutellum not 

 with hairs ; wings hyaline ; arista microscopically pubescent, 



Acantholeria Garrett 



Having no knowledge of the fronto-orbital bristles in the 

 genus Crymobia Loew, I am unable to place it. There is but 

 one American species, C. hiemalis Loew. Anorostomoides 

 petersoni Malloch I believe to be a synonym. Some of the 

 generic features are prosternal bristles absent, mid tibia with 

 two preapical bristles. 



Leria aldrichi, new species. 



Length 3 to 4 mm. One long pair of prosternal bristles. 

 Fronto-orbital bristles equal ; four dorso-centrals. 



Head. Occiput grayish brown, antennas to vertex red yel- 

 low, face and cheeks yellowish, antennae 1 to 3 dark red 

 brown, arista medium long, microscopically pubescent. Vibris- 

 sse two, and long hairs in a single row to lower comer. 



