354 



THE WINGS OF DIPTERA 



vein M3 and Cui. The result of this coalescence where it is carried to its 

 extreme limit is the production of a type of wing in which the homologies of 

 the veins concerned is so obscured that they were not understood until the 

 method of study used here was employed. But by beginning with a 



Fig. 368. — Wing of Pantarbes. 



5,, R, /?..3 



2d A+Cu, 



Fig. 369. — Wing of Conops 



/?.., 



idA^Cu, 



Fig. 370. — Wing of Scenopintis. 



generahzed form in which the homologies of the wing-veins are easily 

 understood and by selecting a series of forms illustrating varying degrees 

 of modification of this form an understanding of the most specialized form 

 is attained. 



