70 CATERPILLARS AND THEIR MOTHS 



of their life, though some have the hoi'D replaced by a 

 tubercle in the later molts, and others show no sign 

 of horn or tubercle. Most of these larvsB have seven 

 oblique lines on each side of the body, though the 

 number may vary from four to ten. 



Some of the caterpillars burrow in the earth to pu- 

 pate, others spin very slight cocoons between leaves on 

 the ground. We find no record of any whiteh spins a 

 dense cocoon. Most of the very young caterpillars 

 spin a thread of silk as they crawl, probably as a guide, 

 and many drop from the tree by this thread when 

 disturbed. 



