THE INSECT WORLD. 
on all sides in its hair, which is to serve it in the construction of 
its cocoon. 
Fig. 116.—Larva of Chelonia caja. 
Another species uses its hairs in the composition of its cocoon ; 
but it adopts an entirely peculiar way of tearing them out, when 
the tissue of its cocoon has become 
a species of network of pretty 
closely packed rings. Réaumur 
one day saw one part of the 
cocoon bristling with hairs. These 
were the hairs of a part of the 
back of the caterpillar, which it 
had pushed through the rings of 
its cocoon. The caterpillar then 
moved about as if rubbing this 
Fig. 117.—Larva of Chelonia caja forming Patt of its back successively in 
Be esa opposite directions against the 
interior surface of the cocoon. In this way the hairs were very 
soon torn out and kept retained in the rings of the cocoon. This 
cocoon is then bristly inside, and does not at all suit the future 
chrysalis, which does not like to be touched by any but smooth 
surfaces. The caterpillar then works with its head, to lay the 
hairs along the interior surface, and to keep them down by threads, 
which it draws over them. At another time Réaumur saw a small 
hairy caterpillar, which appeared to live on lichens, using its hair 
in another way. It tore them out to make its cocoon, but it 
was not to lay them down and work them into a tissue. It set 
them straight up like the stakes of palisades, on the circumference 
of an oval space, in which it was placed. Shut up within this pali- 
sade, it spun a light white web. This web supports the hairs, 


