TABLE OF FAMILIES. 69 



compasses the wing; third vein always furcate; five posterior 

 cells present, the posterior veins not evanescent; antennae (a) , 

 (b), (c). . , Leptidae, pt. 157 



BB. Third joint of 'antenna simple, not composed of annul i, with 

 or without a differentiated style or arista. 



18. Antennae apparently two-jointed, with a three-jointed arista; wings 



(rarely wanting) with several stout veins anteriorly and other, 

 weaker ones apparently connected with them and running ob- 

 liquely across the wing. Femora flattened, the hind ones elon- 

 gated; antennas situated low down. Small, hunchbacked, quick 



running, bristly flies Phoridae, 236 



Not such flies, the antennae almost invariably with three easily 

 distinguishable joints. .... 19 



19. Empodia developed pulvilliform, that is three nearly equal, mem- 



branous appendages on the under side of the claws. 20 



Empodia wanting, vestigial or linear, not developed like the pul- 



villi 22 



20. Squamae very large; thorax and abdomen inflated; head small, 



eyes relatively large; antennae and venation variable. 



Cyrtidae, 182 

 Squamae of moderate size, or small. .... 21 



21. Middle tibiae at least with spurs; no bristles on femora or tibiae; 



third vein furcate; five posterior cells present (four sometimes 

 in Dialysis and iMisgomyia}; anterior cross-vein always dis- 

 tinct; third joint of antennae with a bristle or slender style, 

 usually terminal. Leptidae, pt. 157 



Venation intricate, the third and fourth veins often coalescent for 

 a short distance; tibiae without spurs; antennae with a slender, 

 three-joiuted style; usually hairy. . Nemestrinidae, 186 



22. Third longitudinal vein furcate; two or more submarginal cells 



present. .... 23 



Third vein not furcate, but one submarginal cell. . . 31 



23. Arista or style of antennae always terminal when present. 24 

 Arista dorsal Empididae, pt. 218 



24. Front distinctly hollowed out between the eyes; eyes of males 



never contiguous; basal cells large; mostly large flies. . 25 

 Front plane or convex; males often holoptic. , . 26 



25. Proboscis with fleshy labella at tip; venation complicated, the 



fourth vein curves forward to terminate before the tip of the 



