266 



NORTH AMERICAN DIPTRRA. 



Fig. 103. Micropezidae, Tanypezidse. i, Neriits bistriatus, wing; 

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

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

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



wing. 



TABIvK OF GENERA. 



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



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



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 



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

 Auxiliary vein indistinguishable; posterior femora with a swelling 



beyond the middle (7, 8) Cardiacephala. 



