remarkabh' attenuated body and the more generalized 

 venation. The dividing line between the Dasypogoninae 

 and Laphrinae will be more difficult to make, since there 

 are forms with closed marginal cell whose natural rela- 

 tionships are closer \vith the Dasypogoninae, and vice 

 versa. It is probable that the following characters will 

 be found the most natural, for the ordinary grouping at 

 least: 



A. Palpi one-jointed; antennae with a slender terminal arista. 



B. Marginal cell open; very slender species. Leptogastrinae. 

 BB. Marginal cell closed, less slender or robust species. 



Asilinse. 



AA. Palpi two-jointed; antennae with or without a thickened terminal 

 style; very rarely with a terminal arista, 



C. Marginal cell open, or rarely closed at extreme tip. 



Dasypogoninae. 

 CC. Marginal cell closed Laphrinse. 



TABLE OF GENERA. 



1. Marginal cell of wings open (14). . . . Dasypogoninae. 

 Marginal cell closed (22, 23, etc.) 2 



2. Antennae with a terminal bristle (32). . . . AsilinaB. 

 Antennae with or without a terminal style (24, 25). Laphrinse. 



DASYPOGONINGE. 

 Marginal cell of irinys open; antenna icith or without a terminal stifle or bristle. 



1. Front tibiae with a terminal, claw-like spur (17). . . 32 

 Front tibiae not with a terminal claw-like spur. ... 2 



2. Pulvilli vestigial or wanting, ...... 3 



Pulvilli normal (the hind pair rarely shortened). ... 5 



3. Third joint of antennae with an arista or aristiform style; abdomen 



very slender; hind femora much elongated and clubbed at ex- 

 tremity (Leptogastrinae) (1, 2, 3). . . Leptogaster. 

 Antennae not with a terminal arista. ..... 4 



4. Claws very long, with an elongated tooth at the base of each claw; 



large species (5). Dicranus. 



Claws normal; smaller species. .... Ablautus. 



