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-rnoth. 



Most caterpillars, except the larvae of butterflies, spin 

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



FIG. 235. Cocoon of a moth. 



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

 of the cocoon; in others the cocoon is composed principally 



