202 PTILOTA. 



Amorpha, in which the penultimate state is provided 

 neither with mouth nor organs of locomotion, n>ii>r- 

 quently it neither eats nor moves, neither does it bear 

 any resemblance to the perfect state. 



1. Lepidoptera. 2. Diptera. 



Necromorpha, in which the penultimate state is provided 

 with mouth and organs of locomotion detached from 

 the body, but so inclosed in a case that it can employ 

 neither. The resemblance, therefore, to the perfect 

 insect is very considerable, excepting in total w ant of 

 motion. 



3. Hymenoptera. 4. Coleoptera. 



Isomorpha, in which all the stages are active and voracious, 

 and of a similar form. 



5. Orthoptera. 6. Hemiptera. 



Anisomorpha, in which appear the amorphous, necro- 

 morphous, and isomorphous characters, together with 

 a typical and distinct character. 

 7. Neuroptera. 



The Amorpha, although thus divided into the two orders 

 Lepidoptera and Diptera, are said to be divisible from the 

 metamorphosis into two distinct sections, separated by the 

 fact of their possessing or not possessing, in the penultimate 

 or quiescent state, the last skin of the antepenultimate or 

 previous state. Those which retain such last cuticle are 

 termed Amorpha dermata, and those which do not retain 

 such skin are termed Amorpha adermata, an evident mis- 

 nomer, since, if they do not retain this last-mentioned skin, 

 they still are clothed in their own. But in the following 

 page we are informed that the Amorpha adermata actually 

 " retain two distinct coverings, thus resembling the Amorpha 

 dermata." When, however, we look more strictly at the 

 character of the metamorphosis of these groups, and observe 



