34 TIIE BUTTERFLY VIVARIUM. 



This lias been termed incomplete metamorphosis. 

 Butterflies and Moths undergo far more distinct 

 changes — the Caterpillar, from its birth to its full 

 growth, offering no apparent analogy with the 

 perfect form of the eventual Butterfly, while in 

 the dormant state; the metamorphosis of forms 

 takes place in one entire shell, and the new mem- 

 bers develop themselves, closely pressed to the body. 

 This was considered the complete metamorphosis. 



This most complete kind of metamorphosis was 

 again divided into two tolerably distinct classes : 

 the one, in which the internal forms are more or 

 less distinctly indicated by the external irregulari- 

 ties of the chrysalis, and which was called obtecta ; 

 and the other, in which the chrysalis is an elongated 

 spheroid without any mark or indication of internal 

 parts, as in the chrysalides of Flies ; which last was 

 termed coarctata. 



These were divisions and distinctions adopted 

 by Linnaeus, and more recently by Fabricius, but 

 they are open to many objections. Latreille only 

 makes three distinctions, based on the appearance 

 of the insects in their different stages. In his first 

 class he places all such as come from the egg com- 

 plete, except in size; of which kind, according to 

 more recent classification, there are but few ex- 



