HEXAPODA. 



5* 



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. 

 (After Emerton.) 



FiG. 60.— Nymph of Melanoplus, fourth 

 stage. (After Emerton.) 



Fig. 6r. — 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 ac 

 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 Metamorphosis. — Still other insects, like the but- 



