256 ‘THE INSECT WORLD. 
autumn of 1828, in the environs of Phalsbourg, they were to be 
counted by millions. The extent of the woods laid waste was 
calculated at about fifteen hundred hectares. It is common in 
this eountry. i 
Among the genus Liparis, the species of which are also very 
destructive to trees, we must mention the Brown-tailed Moth 
(Liparis chrysorrhaea, Fig. 236), a species by no means rare in 
England. The caterpillars live in quantities, on apple, pear, and 
elm trees, and destroy the plantations of the promenades of Paris. 
The females of this genus tear off the fur from the extremity of 
their abdomens to make a soft bed for 
their eggs, and to preserve them from 
the cold. And yet they are never to 
see their young, for they die after they 
have laid their eggs. Another tribe 
of Bombycina contains species of a 
small size, which are remarkable 
from the habits of their caterpillars which make, with foreign 
bodies, cases, in the interior of which.they live and undergo their 
metamorphoses. 
The caterpillars of the genus Psyche live in a case composed of 

Fig. 236.—Liparis chrysorrhcea. 

Fig. 240.—Case e Deen ee 

Fig. 241.—Larva of Psyche gramimella. Fig. 242.—Psyche graminella, 
fragments of leaves, of bits of grass and straw, of small sticks, 
