34 



NORTH AMERICAN DIPTERA. 



be reserved for that organ ; he calls them alula? , a term 

 generally applied to the proximal posterior lobe of the 

 wing. 



Fig. 9. Legs, i, leg of Tipnlid; 2, middle leg of Peckia prize eps, 

 male; 3, hind foot of Mallophora scopipeda, male; 4, hind leg of 

 Tropidia quadrata; 5, last tarsal joint of Dialysis; 6, front leg of 

 Stegana hortz, male; 7, hind leg Rhopalomera cilia ta; 8, hind leg of 

 Calotarsa, male. 



LEGS. 



The three pairs of legs are attached to the prothorax, 

 mesothorax and metathorax, and are called, respectively 

 the front, middle and hind pairs. When the front and 

 middle pairs are spoken of together they should be call- 



