ANATOMY AND PHYSIOLOGY 



6l 



Comstock and Needham have succeeded in homologizing 

 practically all the types of neuration, including' such perplex- 

 ing types as those of Ephemerida (Fig. 70), Odonata (Fig. 

 20, B) and Hymenoptera (Fig. 71), and their thorough work 

 affords a sound basis for a rational terminology of the wing 



FIG. 70. 



Wings of a May fly. Lettering as before. 



veins ; there is no longer any excuse for the lamentable confu- 

 sion that has hitherto attended the study of venation. 



Folding of Wing. In some beetles (as Chrysobothris) the 

 wings are no larger than the elytra and are not folded; in 



FIG. 71. 



A typical hymenopterous wing. Lettering as before. 



others, however, the wings exceed the elytra in size, and when 

 not in use are folded under the elytra in ways that are simple 

 but efficient, as described by Kolbe and by Tower. To be 

 understood, the process of folding should be observed in the 

 living insect. As described by Tower for the Colorado potato 



