THE BOMB YCINA. 
IO9 
pimple-like projection. The silkworm caterpillar moves its head 
about in the same manner as other larvae with spinners, and draws 
out the silk in regular lengths. It changes its skin in the manner 
already described in a former chapter, and makes the wonderful 
cocoon before undergoing its first metamorphosis. 
The moths escape from the chrysalis state, which lasts about 
three weeks, and the eggs which are laid in the autumn are 
the moth and larva of Attacus pcivonia viajor. 
hatched during the next spring. Some species, however, have 
two and even three broods in the year. 
There are some splendid moths belonging to the genus 
Attacus, which are closely related to the silkworms. They are 
usually large insects, and with very fine wings. Their antennae 
are beautifully feathery, and decorate the heads of the moths 
very prettily. Some have wings with tailed prolongations, like 
the butterflies of the swallow-tail group, and, indeed, they 
exceed those of any other Lepidoptera in length. Their cater- 
pillars are large and heavy, but are very beautiful. Some have 
