LEPILXn'TERA ; BUTTERFIJES. 



153 



nests in which they live, or to which they retire for 

 shelter; others live in solitude, either in the light 

 and air, or sheltered in leaves folded over them, or in 

 silken sheaths which they make ; and some conceal 

 themselves in the ground, coming forth only to eat. 

 In the middle of the lower lip there is a little tube, from 



which the caterpillar spins silken threads. Two long 

 slender bags within the bod)-, ending in the spinning 

 tube contain the material from which the silk is made ; 



