North Amkkican Diptkka. 28 



low woodlands, on bushes, etc., and prey upon other insects. Some 

 western species of Symphoromyia suck blood, as do the horse- 

 flies. 



1. Front tibia' with terminal spurs. ... ... 2 



Front tibiie without spurs. .3 



2. Front tibia? with two spurs ; five posterior cells in the wing. 



Triptotricha 

 Front tibia" with one spur; four posterior cells in the wing. 



Agnotomyia 

 8. Third joint of antenna? round, oval, or pear-shaped, its bristle 



distinctly terminal. . 4 



Third joint kidney-shaped, the arista more dorsal, . . (i 



4. Anal cell open ; hind tibia' with two spurs. Leptis 

 Anal cell closed. o 



5. Third joint of antenna? with a slender arcuate bristle ; hind tibia- 



with one spur. Chrysopila 



Third joint with a shorter, slender style. Spania, Ptiomna 



H. Hind tibijE with two spurs ; anal cell closed. Atherix 



Hind tibiae with one spur ; anal cell open. Symphoromyia 



Arthropeas Loew, Stett. Ent. Zeit. 1850. 



Arthuoceras Williston, Entom. Amer. II, 107, 1886. 



Gurrops Burgess, Proc. Boston Soc. Nat. Hist. 1878, 320. 



Triptothiciia Loew, Centur, X. 15, 1874. 



Agnc^omyia Williston, Entom. Amer. II, 106, 1886. 



Chrysopila Macquart, Dipt, du nord de la France, 1827. 



Leptis Fabricius, Syst. Antl. 69, 1805. 



Spania Meigen, Syst. Beschr. VI, 335, 1830. 



Ptiolina Zetterstedt, Dipt. Scand. I, 226, 1843. 



Atherix Meigen, Illiger's Magaz. II, 271, 1803. 



Symphoromyia Frauenfeld, Verb. Zool. Bot. GesclLsch. 491, 1867. 



ASILID./E. 



Species of moderate to large size ; bristly ; predaceous. Head 

 flattened, the eyes prominent. Front concave between the eyes, the 

 eyes not contiguous in either sex. Ocelli present. Antenna? i)orrecl, 

 with or without a terminal bristle or style ; when with a terminal 

 style, the antennae apparently four or five-jointed. Proboscis pro- 



