"
When the feeding period is finished in freedom, the caterpillar,
if hairless, must be ready to evolve from its interior, the
principal part of the winter quarters characteristic of its species
while changing to the moth form, and in the case of non-feeders,
sustenance for the lifetime of the moth also. Similar to the moth,
the caterpillar is made up of three parts, head, thorax, and abdomen,
with the organs and appendages of each. Immediately after moulting
the head appears very large, and seems much too heavy for the size
of the body. At the end of a feeding period and just previous to
another moult the body has grown until the head is almost lost from
sight, and it now seems small and insignificant; so that the appearance
of a caterpillar depends on whether you examine it before or after
moulting.
The head is made up of rings or segments, the same as the body, but
they are so closely set that it seems to be a flat, round, or
pointed formation with discernible rings on the face before casting
time.
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