154 



THE WINGS OF NEUROPTERA 



A study of a series of wings of Corydalns cornutns has shown that the 

 forking of the first branch of the radial sector in this species is of very- 



Fig. 147. — Base of the fore wing shown in Figure 146, enlarged. 



irregular occurrence, and that there is a similar irregular forking of other 

 veins in this region of the wing. In the specimen represented in Figure 148 

 vein Ml is forked in a similar manner, so too is the fourth branch of the 

 sector; in the latter case one division of the forked vein is again forked. 



In a collection of nineteen wings of Corydalus cornutus, that had been 

 mounted for laboratory use and which had been taken at random, I find 

 the first branch of the radial sector forked n only two specimens; the third 

 branch, in one; the fourth branch, in one; the fifth branch, in seven; the 

 sixth branch, in twelve; and the seventh branch in four. 



The evidence presented by this species indicates that the short branches 

 near the margin of the wing in the area of the radial sector are merely 

 marginal accessory veins; and that the forking of the first branch of the 



Fig. 148. — Fore wing of Corydalus cornuttis in whii^h tlu' first l^ranch of the radial 



sector is forked. 



