STRATIOMYID.E- 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 (20, 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 (30). Clitellaria. 

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



35. Face produced conically. ■ 36 



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



36. Males holoptic (24) 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 (9,10) 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 situated 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 



