22 6 NORTH AMERICAN DIPTERA. 



8. Legs robust, all the femora of nearly equal length; males dichoptic. 



Pachymeria. 



Hind legs longer than the others, their femora but little thickened; 

 males sometimes holoptic. ....... 9 



9. Face hairy (24). ...... Empimorpha. 



Face bare (22) Empis. 



10. Auxiliary vein short, recurved at its end to meet the costa; pro- 



boscis shorter than height of head; front metatarsi of male 

 usually swollen (27). ...... Hilara. 



Auxiliary vein straight, extending to near the middle of the wing, 

 evanescent at its tip so as not to meet the costa; male front me- 

 tatarsi but rarely swollen. . . . . . . . ii 



11. Body and legs without bristles; the costal vein encompasses the 



entire wing. ......... 12 



Body and legs with bristles. ....... 13 



12. Proboscis much longer than head (2,9). . . . Toreus. 

 Proboscis shorter than head (3, 11). . . Hesperempis. 



13. Proboscis porrect, about as long as height of head; palpi prom- 



inent ; nearly as long as the proboscis; third antennal joint 



nearly cylindrical, its style minute; hypopygium usually with 



a pair of dorsal processes; males holoptic. . Iteaphila. 



Proboscis shorter; males dichoptic. ..... 14 



J4. Third antennal joint short oval, with a rather short and thick 



style; proboscis horizontal (South America). Apalocnemis. 



Third antennal joint elongate; proboscis vertical. . . 15 



15. Femora more or less thickened; much longer than the tibiae; third 



antennal joint long, nearly cylindrical; thorax and legs with 



few bristles (South America). . . . Haplomera. 



Femora not thickened nor longer than the tibiae; third antennal 



joint conical. (South America.) . . . Hilarempis. 



Anthalia Zetterstedt, Ins. Lapp. (1838), 538. 

 Anthepiscopus Becker, Wien. ent. Zeit. (1891), 281. 

 Apalocnemis Philippi, Verh. k. k. zool.-bot, Gesellsch. , (1865), 752. 

 Bicellaria Macquart, Soc. Sci. Agr. Arts. Lille, (1823), 155. 

 Chelipoda Macquart, Soc. Sci. Agr. Arts, Lille (1823), 148. 

 Chersodromia Walker, List. Dipt. Ins. Brit. Mus. iv, (1849), JI 57- 

 Cladodromia Ann. Mus. Nat. Hung. (1905), 453. 



