HEXAPODA. 



51 



It is of course much smaller than the adult, and is not fur- 

 nished with wings. Still the form of the body is essentially 

 the same as that of the adult (Fig. 57). (The hair-line 

 above the figure indicates the natural size of the insect.) 

 After a time rudimentary wings appear; and these increase 



Fig. 57.— Nymph of Melanoplus, 

 first stage. (After Emerton.) 



Fig. 58.— Nymph of Melanoplus, 

 second stage. (After Emerton.) 



Fig. 59.— Nymph of Melanoplus, third stage. Fig. 60.— Nymph of Melanoplus, fourth 

 (After Emerton.) stage. (After Emerton.) 



Fig. 61.— Nymph of Melanoplus, fifth 

 stage. (After Emerton.) 



Fig. 62. — Melanoplus, adult. 



in size from time to time till the adult state is reached (Figs. 

 57 to 62). During this development there is no point at 

 which the insect passes into a quiescent state corresponding 

 to the chrysalis state of a butterfly. Those insects which, 

 like the locust, when they emerge from the egg resemble in 

 form the adult, but still undergo some change, are said to un- 

 dergo an incomplete metamorphosis. In other words, after 

 leaving the egg they do not undergo a complete change of 

 form. 



Complete Metamor pilosis. — Still other insects, like the but- 



