266 



NORTH AMERICAN DIPTERA. 



Fig. 103. Micropezidae, Tanypezirke. 1, Nerius bistrialus, wing; 

 2, Nerius, head; 3, Telostylus, antenna; 4, Calobata melted, wing; 5, 

 Micropeza, wing; 6, Micropeza antenna; 7, Cardiacephala, head; S> 

 Cardiacephala, hind leg; 9, Tanypezaclaripennis, head; 10, Tanypeza, 



TABLE OF GENERA. 

 Second hasal cell confluent with the discal cell (5,6). Micropeza. 

 Second basal cell complete. ....... 2 



Third antennal joint truncate at the tip, with a terminal bristle 

 (1,2) Nerius. 



Third antennal joint tapering to a point, into which is inserted 

 the apical, pubescent arista (3). . Telostylus bigot. 



Arista distinctly dorsal, that is nearer the base of the third joint 

 than its tip; wings usually with markings. ... 3 



Auxiliary vein distinct; femora simple (4). . . Calobata. 



Auxiliary vein indistinguishable; posterior femora with a swelling 



beyond the middle (7, 8) Cardiacephala. 



