484 



NORTH AMERICAN DIPTERA 



eiv luixiliaryi vein ^ , 



—1—1 I ' ' rosiiif I 



WING OF TABANUS 



The terminology of the veins and parts shown on this figure is that used 

 in the present work, except in the Tipuloidea. 



WING OF SILVIUS 



Comstock-Needham system. Veins. C — costa, Sc — subcosta, R — radius. 

 M — media, Cu — cubitus, A — anal. Cells. C — costal, Sc — subcostal, R— radial, 

 M — medial, Cu — cubital, A — anal. 



ib - Siihtost, 1 1 



.sfi,7 y. 



WING OF PANGONIA 



Schiner's system. Cells. 1, costal; 2, mediastinal; 3, subcostal; 4, 5, 

 cubital; 6, 7, 8, 9, 11, first to fifth posterior cells; 12, discoidal cell; 13, 14, 15, 

 first to third basal cells; 16, axillary cell. 



