FAMILY OrOMYZID.E 331 



6. Frontal vitta with bristles (2, 13) *Rhicnoessa Loew 



Frontal vitta without bristles (Chyromyidae) t^eossos Malloch 



7. Acrostical hairs present 8 



Acrostical hairs absent *Pelomyiella Hendel 



8. Oral margin strongly produced forward; lower edge of head straight 



and long Neopelomyia Hendel 



Face not strongly produced below, the lower edge convex (3, 14, 15). 



*Pelomyia Williston 



9. Scutellum with hair; wing with anal angle (8, 10) Opomyza Fallen 



Scutellum with bristles only; no trace of anal angle 10 



10. Hind margin of the wing strongly concave (9) . . . . Mutiloptera Coquillett 

 Hind margin of the wing at most very weakly concave (5). 



Geomyza Fallen 



* Hendel. 1934. Tijd. v. Ent., Ixxvii. pp. 35-54. 

 t 1927, Proc. Ent. Soc. Wash. 



