ANATOMY AND PHYSIOLOGY mop! 
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 
ap 
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 
TG a7 
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 
