SHEATH-WINGED INSECTS Ml 



the protecting case formed by the sheaths ; and these 

 can fly. Others, relatively few, are unprovided with 

 membranous wings, and hence are unfitted for flight. 

 This entire group bears the general name of coleop- 

 tera, meaning sheath-winged. A coleopter is any in- 

 sect furnished with sheaths, whether it flies or not." 



