ASILIDTfv 57 



28. Face bare with bristles on tlic oral margin, in profile straight or con- 



cave, the oral niargin most prominent. ..... 29 



Face convex below, the oral margin not prominent, more or less cov- 

 ered with hair. .......... 31 



29. Fourth posterior cell closed a considerable distance before the margin 



of the wing. oO 



Fourth posterior cell open or closed in the margin. Sarapogon Locw. 



30. Hind pulvilli much shorter tiian the elongated claws; abdomen con- 



tracted toward the base (Central and South America). 



Blepharepium Eondani. 



Hind pulvilli not nmch shorter than the claws; abdomen not contracted 



toward the base Deromyia Philippi. 



31. Tliird joint of the antenna; more or U'ss dilated, the style very short. 



Lestomyia Williston. 

 Third joint of antenna? slender, elongate. . .... 32 



32. Head broad and flat, the face not gibbose 33 



Face convex, densely covered with hair; thickly pilose species (Cen- 

 tral and South America). .... Lastaurus Loew. 



33. Abdomen finely punctulate Taracticus Loew. 



Abdomen smooth, not punctulate. ...... 34 



34. Hind tibisE at the tip and their tarsi thickened 35 



Hind tibiae at the tip and their tarsi not thickened ; fourth posterior. 



cell wide open (Mexico). . . . Copuura Osten Sacken. 



35. Fourth posterior cell wide open ; abdomen flattened, in the 9 ^ little 



broader beyond the middle; in the $ near the tip, the last two seg- 

 ments of which are conspicuously silvery above. 



Nicoci.ES Jaennicke. 



Fourth posterior cell narrowed ; abdomen of male not silvery above 



(Blacodes preoc.) Loewiella, nom. nov. 



LAPHRINiK. 



1. Front tibise with a terminal claw-like spur 2 



Front tibiae without claw-like spur 4 



2. Hind tibia; thickened, club-like at the extremity ; hind metatarsi thick- 



ened and elongate. ......... 3 



Hind tibia; not clubbed ; hind metatarsi of the usual structure (Central 

 and South America). .... Megapoda Maci^uart. 



3. Thorax projecting prominently in front over the head (Central and 



South America) Pseudorus Walker. 



Thorax not projecting prominently in front (Central and S. America). 



Dorycms Jaennicke. 



