THE LEPIDOPTERA 



251 



FIG. 251. Common Bag Worm (Thyridopteryx ephemeroeformis Haw.): 10, bag, as 

 seen in winter; 11, same, cut open, showing pupa case and eggs; 12, eggs; 13, young larva; 

 14, cases of young larvae on a twig; 15, older larvae in tbeir bags, one hanging by a thread 

 it has spun; 16, full-grown larva removed from its case; 17, full-grown larva, crawling; 

 19, adult (wingless) female Moth; 20, adult male Moth; 22, bag of male with empty pupa 

 case protruding from its lower end. All natural size except 12 and 13 which are greatly 

 enlarged. (From Houser, Ohio Agr. Exp. Sta. Bull. 332: After Felt.) 



