172 



THE WINGS OF NEUROPTERA 



Media coalesces with radius for a considerable distance at the base of 

 the wing. It is four-branched; and veins M3 and M4 each bears an acces- 

 sory vein. A similar accessory vein is borne by vein Cui. 



The fore and hind wings are very similar as regards the features men- 

 tioned above ; but the course of vein Cui is markedly different in the two 

 wings. In the fore wing, the basal part of vein Cui extends directly forward 



Fig. 167. — Wings of Inocellia longicornis; cv, cv, cv, cross-veins. 



from the cubital fork until it reaches media, with which its coalesces for a 

 short distance. In the hind wing, the cubital fork is much nearer the base 

 of the wing than it is in the fore wing, and vein Cui extends directly to the 

 margin of the wing, being connected with media only by two cross-veins, 

 the first of which is oblique. 



Vein Cu2 in the fore wing is connected with the first anal vein by a very 

 short cross-vein; in the hind wing these two veins are closely approximate 

 but they do not anastomose. 



In Inocellia the radial sector has moved out towards the apex of the 

 wing, which has resulted in the shortening of veins R2, R3, R4, and R5 so 

 that they appear like the accessory veins that have been developed upon 

 veins Ms, M4, and Cui. 



The wings of Raphidia adnixa may be taken as illustrating the tj^pe of 

 wing- venation characteristic of the genus Raphidia (Fig. 168). In this 

 species, the wings present two marked differences from those of Inocellia 

 longicornis ; these are the presence of a larger number of accessory veins 

 and the fact that the radial sector, although still dichotomously branched, 

 shows the beginning of the development of the pectinately branched type. 



