THE LOCUST-TREE CARPENTER-MOTH. 413 
(Fig. 205), or locust-tree carpenter-moth. The moths of 
this genus have thick and robust bodies, broad and thickly- 
veined wings, two very distinct feelers, and antennae, which 
Fig. 205. 
are furnished on the under side, in both sexes, with a double 
set of short teeth, rather longer in the male than in the 
female. Their tongue is invisible. They give out a strong 
and peculiar smell, whence they are sometimes called goat- 
moths by English writers. 
Some caterpillars, which eat the leaves of plants, live in 
cases or long oval cocoons, open at both ends, and large 
enoush for the insects to turn around within them, so as to 
go out of either end. They do not entirely leave these cases, 
even when moving from place to place, but cling to them on 
the inside with the legs of the hinder part of their bodies, 
while their heads and fore legs are thrust out. Thus in 
moving they creep with their six fore legs only, and drag 
along their cases after them as they go. These cases are 
made of silk within, and are covered on the outside with 
leaves, bits of straw, or little sticks. The caterpillars are 
nearly cylindrical, generally soft and whitish, except the 
head and upper part of the first three rings, which are brown 
and hard ; they have sixteen legs ; the first three pairs are 
long, strong, and armed with stout claws ; the others are 
very short, consisting merely of slight wart-like elevations 
