THE WINGS OF SIALIDM 



1G9 



It is unnecessary to describe these wings in detail, as the lettering of the 

 figures indicates the homologies of the wing-veins. Some of the more 



Fig. 163. — Wing of a pupa of Sialis injumata (After C. & X.). 



striking features are the following: the prominence of the accessor}^ 

 branches of the subcosta; the coalescence of the tips of veins Sc and Rr, 

 the partial atrophy of the intermediate portion of media in the fore wing 



Fig. 164. — Wings of Sialis iiifitniata. 



and of the greater part of the stem of this vein in the hind wing; the 

 anastomosis of veins M and Cu, in the fore wing; and the manner of 

 branching of the radial sector. 



