SYSTEM OF INSECTS. 



should be a mutual imitation in all the states of any two 

 insects. Wherever we discover a marked resemblance 

 between two perfect insects, there is a true analogy, 

 though their metamorphosis may differ; and where there 

 is not that resemblance, though the metamorphosis may 

 agree, there is no analogy. In fact, insects are some- 

 times analogous in their first state and not in their last ; 

 and at other times analogous in their last and not in their 

 Jlrst ; but the analogy is most perfect when it holds in 

 all their states : it then, indeed, almost approaches to an 

 affinity. They may also be analogous to each other in 

 their habits and economy, when there is little or no re- 

 semblance in their form ; and, vice versa, be analogous in 

 their form and not in their habits. So that different sets 

 of analogies may be assumed as foundations for different 

 systems. Thus Mr. MacLeay assumes the metamar- 

 phosis as the basis of analogy between the corresponding 

 Orders of Mandibulata and Haustellata a , while M. Sa- 

 vigny compares the perfect insects b : the result therefore 

 differs in some instances. I shall now lay before you 

 in a tabular view their plans and my own. 



SAVIGNY. 

 MANDIBULATA. HAUSTELLATA, 



Hor. Entomolog* 456. Comp. Linn. Trans, xiv. 67 

 Mem, stir fes Anim, nans Vcrtebr, I. i, 20 - . 



