380 



THE WINGS OF HYMENOPTERA 



wing-venation of the H\TTienoptera, an understanding which will doubtless 

 make available much data of great value in working out the relationships 

 of the various divisions of the order. 



The only way in which the identity of the remaining veins in a wing in 

 which the venation is greatly reduced can be satisfactorily determined is 

 by comparison with allied foiTns in which the reduction has not been 

 earned so far. And the more complete the series that can be found illus- 



Cu&Cui 



istA 



Fig. 403. — Fore wing of Semceodogaster barlicensis. 



trating the successive steps in the modification of the wing-venation the 

 more satisfactory will be the conclusion. 



As an illustration of this method of study and of the results that can be 

 obtained by it I include here a series of figures taken from Professor 

 Bradley's monograph of the Evaniidos (Bradley '08). 



Figure 400 represents the venation of the fore wing of Anlacinus fusiger, 



(^^^ + Cui 



Fig. 404. — Fore wing of Hyptiu. 



a member of the subfamily Aulacinae. This is selected as the first of the 

 following series as it is the most generahzed wing of the family. Note that 

 veins R4, R5, and all of vein M2 are present. 



It is in the subfamily Evaniinai that the most extensive modification 

 of the wing-venation is found; for this reason the remaining members of 

 this series of figures have been selected from those illustrating this sub- 

 family. 



