70 THE BUTTERFLY VIVARIUM. 



true larva?. The larvae of the second class referred 

 to, generally "belonging to the great insect divi- 

 sions termed Hemiptera and Orthoptera, are also 

 of nearly the same form when horn as that which 

 they are eventually destined to wear, with the ex- 

 ception of the wings, which at each casting of the 

 skin appear in a more advanced state. These have 

 heen called semi- or half-larvae, as not heing en- 

 tirely different from their eventual form, and as 

 not having the worin-like character which generally 

 distinguishes a true larva. They are also dis- 

 tinguished by the gradual change by means of 

 which they arrive at perfection, without any sudden 

 and remarkable change, or metamorphosis. In this 

 class it is very easy to discover the future form of 

 the Cricket or Grasshopper, and other insects, even 

 in its earliest larva stages, though some undergo 

 very considerable change. 



The larva? of the third class, composed in general 

 of those of Beetles, Butterflies, and Moths, and 

 perhaps some Neuroptera, do not in any case, in their 

 appearance in that state, suggest the nature of the 

 form which they are destined eventually to develop. 

 There are, however, exceptions in this respect even 

 among the well-defined larvae of Butterflies and 

 Moths ; for instance, in that of a small species of 



