158 STATES OF INSECTS. (Larva.) 
which organized objects bear to each other is of two 
kinds; one of real affinity, and the other only of ana- 
logy, or resemblance. ‘This important distinction, upon 
which I shall enlarge in a future Letter, when I come to 
treat of Systems of Entomology, he has applied, in a way 
quite original, to larvee in general, but more particularly 
to those of the Coleoptera order. For the basis of his 
system he assumes a relation of analogy between the 
larve of Insects that in the progress of their metamor- 
phosis assume wings, and those that do not, which form 
his class Ametabola, so that the prototypes of the former 
shall be found amongst the latter?. But though Mr. 
MacLeay appears to consider the analogy between these 
two as primary, he extends it in a secondary sense to the 
Crustacea, at least in several instances. Upon this oc-: 
casion he very judiciously remarks, that “in terming 
larvee Chilognathiformes or Chilopodiformes, it is not 
meant that they are Scolopendre or Juli, or even near to 
them in affinity; but only that they are so constructed 
that certain analogical circumstances attending them 
strongly remind us of these Ametabola‘.” 'This remark 
you will bear in mind while I am treating of this subject. 
It should seem from another part of the same paragraph, 
that the comparison which our learned Physiologist re- 
commends, is between the young of the Ametabola and 
the larvee of the corresponding groups of Coleoptera. 
This must be understood to refer chiefly to the young 
of the Chilopoda and Chilognatha, since they approach 
nearer to them in that state, having then only six legs; 
but the rest.of the Ametabola should certainly be brought 
to this comparison in their adult state: and even the two 
* Hor. Entomolog. 285, 397—. 422. 462—. &c. 
> Ibid. 399—401. © Hor. Entomolog. 423. 
