STRATIOMYID^. I7I 



30. Antennae short, with a subterminal arista. . . Oxycera. 

 Antennae more or less elongate. ...... 31 



31. Antennae situated near the oral margin, third joint composed of 



five or six segments (22) ... . Euryneura. 



Antennae situated near middle of head in profile. . . 32 



32. Antennae much elongated; style not differentiated; eyes bare; 



smaller species (2O, 21) Euparhyphus. 



Antennae moderately elongated. ...... 33 



33. Style of antennae not differentiated; eyes pubescent; occiput flat- 



tened (28). . . . Scoliopelta. 



Style of antennae distinctly differentiated. . . .34 



34. Eyes pubescent; antennae with a slender style (3O). Clitellaria. 

 Eyes bare; style not slender (25). . . . Aochletus. 



35. Face produced conically. ...... 36 



Face not produced. ........ 37 



36. Males holoptic (24 1 ). ... . Nemotelus. 

 Males dichoptic. ........ Alisonia. 



37. The third antennal joint terminates in a very long, densely fringed, 



lamelliform style; large, elongate species; eyes pubescent or 

 bare ( 9, 1O ) Hermetia. 



Third joint of antennae with a short, thickset, differentiated style 

 terminating in a short bristle ; eyes pubescent ; moderate sized 

 species (23) Pelagomyia. 



The third antennal joint tapers into a long, thickened, or styliform 

 arista, the basal two-thirds of which is short but densely plu- 

 mose, the distal extremity bristly; eyes bare (Cacosis, S. A.). 



The third antennal joint terminates in a long slender arista, not 

 at all pubescent or hairy at base; eyes bare, large species (fig. 

 55:34) Chrysochlora 



PACHYGASTRIN^:. 



38. Antennae sitiiated near or toward the oral margin; scutellum spin- 



ose; males holoptic; eyes pubescent. .... 39 

 Antennae situated near the middle of the head in profile. . 43 



39. Third joint of antennae forked; scutellum quadrispinose. . 42 

 Third joint of antennae not forked. ..... 40 



40. Third joint of antennae elongate, with a short, differentiated style; 



scutellum quadrispinose (6). .... Acanthina. 

 Third joint of antennae shorter; ending in a bristle. . . 41 



