FOREST LIFE. 



205 



When a bag-worm is fully grown, it fastens its 

 sac to a twig and changes to a pupa within it. And 

 here the females remain until death, leaving their 

 eggs within their sacs. These females are grublike 

 creatures without wings. But the male pupa works 

 his way out from the lower end of his sac, and 

 changes to a winged moth. Fig. 172 represents the 



^^ 



Fig. 172. Fig. 173. Fig. 174. 



sac of a male with the empty pupa skin projecting 

 from the lower end, and Fig. 173 the fully developed 

 male. These figures are of one of our smaller species. 

 Fig. 174 represents the male of one of the larger 

 species. 



OTHER LARGER LEAF-EATING CATERPILLARS. 



In addition to the species mentioned above, there 

 are very many of the larger caterpillars that infest 

 the foliage of forest trees. Any one of these may be 

 taken as a subject for study, and the work carried on 

 in the manner outlined for the stud}' of similar orchard 

 insects. See page 172. 



THE SMALLER LEAF-EATING CATERPILLARS. 



There is an immense number of small caterpillars 

 that infest the foliage of forest trees. Of this number, 

 the majority of those that would attract the attention 



