162 



THE INSECT WOBLD. 



maker, and weaver, arranges it in such a way as to form a 

 hollow cone, which it only remains for it to shut. Reaumur 

 calls this sort of cocoon or shell, la coque en bateau, the boat- 



V. 





Figs. 122, 123. Cocoon of Pyralis corticalis (magnified, proper size | inch). 



shaped cocoon. Some caterpillars weave cocoons of the same 

 form with pure silk. 



To bring this subject to an end, we will mention the industry 

 of the Puss-moth (Dicranura vinula), and that of a small Tineina, 

 which eats the barley stored away in our granaries. 



The larva of the Puss-moth employs in the construction of its 

 shell the wood of the tree on which it has lived. It bites it 

 up, and, mixing it with a glutinous fluid which it secretes from 



