38 Families and Genera of 



IsoPENTHES Osten Sacken, Biologia Centrali-Anu'ricaiKi. I)i))UTH, 



96, 1886. 

 DiPALTA Osten Sacken, Western Dipt. 236, 1877. 

 Argykam(eba Schiner, Weiner Ent. Monatschr. IV, 51, 1860. 

 AsTROPHANES Osten Sacken, Biologia Centrali- Americana, l)ii)ti'ra, 



106, 1886. 



Lepidanthrax Osten Sacken, Biologia Centrali- Anieiicana, Diptera, 



107, 1886. 



Anthrax Scopoli, Ent. Carn. 1763. 



Oncodocera Macquart, Dipt. Exot. II, 83, 1840. 



Epacmus Osten Sacken, Biologia Centrali- Americana. l)i])tera, 142. 



1886; Leptochilus Loew, preoccupied. 

 ApHfEBANTus Loew, Ccntur. X, 39, 1872. 

 BoMBYLius Linne, Fauna Suecica, 1758. 

 CoMASTES Osten Sacken, Western Dipt. 256, 1877. 

 Ststcechiis Loew, Neue Beitr. Ill, 34, 1855. 

 Anast(eciius Osten Sacken, Western Dipt. 251, 1877. 

 Pantarbes Osten Sacken, Western Dipt. 254, 1877. 

 Sparnopoliu.s Loew, Neue Beitr. Ill, 43, 1855. 

 LoRDOTis Loew, Centur. V, 53, 1863. 

 Paracosmiis Osten Sacken, Western Dipt. 262, 1877. 

 Phthiria Meigen, Illiger's Magaz. 1803. 

 Geron Meigen, Syst. Beschr. II, 223, 1820. 

 Ststropcs Wiedemann, Nov. Dipt. 1820. 



Lepidophora Westwood, Lond. and Edinb. Phil. Magaz. 1835. 

 ToPHORA Meigen, Illiger's Magaz. II, 270, 1803. 

 EcLiMU-s Loew, Stett. Ent. Zeit, 1844, 154. 

 Rhabdoselaphus Bigot, Bullet. Soc. Ent. Fr. 1886, p. Clll. 

 Mancia Coquillett, Can. Entom. 1886, 159. 

 EccESSiA Coquillett, Can. Entom. May, 1886. 



THEREVID^E. 



Rather small, elongate, bristly, predaceous flies. Eyes of tiie 

 male contiguous ; front in the female not excavated. Antenna^ 

 composed of three joints, the third simple, with a terminal style, 

 sometimes wanting. Proboscis moderately projecting, the labella 

 broad. Ocelli present. Abdomen elongate; genitalia ( J , ^ ) "i'"'- 

 crately or but little prominent. Legs slender, bristly ; emjiodia 

 wanting. Third longitudinal vein of the wings furcate, the ])()steri<)r 



