162 THE INSECT WORLD. 
maker, and weaver, arranges it in such a way as to form a | 
hollow cone, which it only remains for it to shut. Réaumur 
calls this sort of cocoon or shell, da cogue en bateau, the boat- | 
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Figs. 122, 123.—Cocoon of Pyralis corticalis (magnified, proper size 2 inch). 
shaped cocoon. Some caterpiliars 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 T%neina, 
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 

