EMPIDID^. 



223 



5. Antennae three-jointed: legs thick and bristly (8). Coloboneura. 

 Antennae two-jointed; legs but little thickened and \vith few bris- 

 tles Chersodromia. 



6. Arista dorsal; other characters as in Drapetis. . Stilpon. 

 Arista terminal or subterminal. ...... 7 



7. Hnmeri not constricted from the mesonotum; thorax broader than 



the abdomen; second longitudinal vein short, and gently curved 

 forward; the second and third sections of the costa subequal; 

 palpi broad (19, 2O). ...... Drapetis. 



Humeri constricted from the mesonotum; thorax not broader than 

 the abdomen; second longitudinal vein straight until near the 

 end; palpi narrow. ..... 8 



8. Second longitudinal vein abruptly recurved at tip; second section 



of costa shorter than the third. . . . Phoneutisca. 



Marginal cell lengthened; second section of costa longer than the 



third. ........ Tachydromia. 



HEMERODROMIIN^B. 



1. Front legs raptorial, the front coxae and femora subequal in 



length; front femora and tibiae spinose below. ... 2 



Legs very slender and without spines; front coxae not greatly 



lengthened. .......... 3 



2. Third longitudinal vein simple; discal cell emitting three posterior 



veins; antennae with a long arista. . . . Chelipoda. 

 Third longitudinal vein branched; antennae with a short style. 



Hemerodromia. 



a. Anal and discal cells present. ...... b 



Discal cell open. ........ c 



b. Second posterior cell pedunculate, subgenus Hemerodromia. 

 Second posterior cell sessile. . subgenus Cladodromia. 



c. Anal cell wanting (15). . . subgenus Microdromia. 

 Anal cross-vein present. ....... d 



d. Second posterior cell petiolate. . . subgenus Metachela. 

 Second posterior cell sessile (26). . subgenus Neoplasta. 



3. Proboscis short, sharp and incurved; outer antennal joint conical, 



with a moderately long style; anal cross-vein perpendicular to 

 hind margin of wing. ........ 4 



Proboscis vertical, usually soft; outer antennal joint short ovate, 

 with a lengthened arista; anal cell usually rounded at tip. 5 



4. Second posterior cell petiolate. . . . Roederiodes. 

 Second posterior cell sessile. .... Boreodromia. 



