osciNime. 



313 



7. Facs concave in profile, the oral margin produced. . . 8 

 Face receding in profile, the oral margin not produced. . 9 



8. Oral vibrissae wanting; proboscis often elongated and folding (8, 



9) Siphonella. 



Oral margin with vibrissae; proboscis fleshy, not folding ; front 

 with bristles (see fig. 37, Ephydridae. Genus new?) 



9. Third antennal joint round or oval, with a bare or pubescent dor- 



sal arista.* Oscinis. 



Third antennal joint more reniform, with a subterminal short- 

 plumose arista; eyes pubescent (3). . . . Gaurax. 



10. No posterior cross-vein; first three longitudinal veins curved 



forward Elliponeura. 



Posterior cross-vein present. . . . . . . 11 



11. Head produced conically in front. ..... 12 



Head not produced conically in front. ..... 13 



12. Third antennal joint much longer than wide; eyes large; front 



excavated. Ectecephala. 



Third antennal joint but little longer than wide, oval or reniform; 

 eyes not large; front not narrowed nor excavated (4, 12). 



Eurina. 



13. Hind femora much thickened (5, 6) . . . Meromyza. 

 Hind femora not thickened Chlorops. 



* If shining black species, the face rather convex and roughened, 

 the arista bare, compare Mosillus, Ephydridae. 



