194 



THE STUDY OF INSECTS. 



fleshy, without joints, elastic or contractile, and are generally 

 surrounded at the extremity by numerous, minute hooks 

 (Fig. 234) ; they are termed pro-legs. 



Fig. 234.— Larva of a Hawk-moth. 



Most caterpillars, except the larvae of butterflies, spin 

 cocoons (Fig. 235). In some instances, as in case of the 



/ig. 235. — Cocoun of a moth. 



silkworms, a great amount of silk is used in the construction 

 of the cocoon ; in. others the cocoon is composed principally 



