THE WINGS OF HYMEN OPT ERA 



381 



Figure 401 represents the venation of the fore wing of Evania appeiidi- 

 gaster; in this wing the modifications of the evaniid type as illustrated by 

 Aulacinus are not great. Veins R4 and Rj are lost, and also the transverse 

 part of vein Mo. The coalescence of media with radius has progressed 



Fig. 405. — Fore wing of Evaniellns. 



farther; this has resulted in a striking change in the direction of the cross- 

 vein m-cit. 



The reduction of the wing-venation by the atrophy of veins which is 

 well under way in Evania has been carried farther and farther in the succes- 

 sive forms represented in this series of figures (Fig. 402, 403, 404, and 405) 

 until in the last, EvauieUiis, only two veins are left ; these are the costa and 

 veinSc + R M- M. 



