344 



GENERAL BIOLOGY 



the adult. In the former case, there are but two stages of 

 metamorphosis, following hatching, the nymph* (fig. 196) 

 and the adult (imago). In the latter, there are three: 



FIG. 195. An adult grasshopper. 



larva, pupa and adult. When the differences between the 

 larva and adult become so great that rapid change from 



FIG. 196. A grasshopper nymph, well gro\ 



*Larva is'a general term, covering all sorts of immature stages, 

 each of which bears a separate designation in nearly every one of 

 the major groups of animals: nymph is the name for one sort of 

 larva in insects the sort that is most easily recognized by its 

 externally developing wings. 



