422 SYSTEM OF INSECTS. 



MACLEAY. 



MANDIBULATA. HAUSTELLATA. 



Trichoptera Lepidoptera 



Hymenoptera Diptera 



Coleoptera Aptera 



Orthoptera Hemiptera 



Neuroptera Homoptera. 



K. AND S. 



Coleoptera Hemiptera Leach 



Orthoptera Homoptera Leach 



Neuroptera Lepidoptera 



Hymenoptera Diptera. 



In these two last columns, you see, I differ little from 

 M. Savigny: I merely exclude the Aphaniptera as 

 forming an osculant Order, and I have added the Co- 

 leoptera and Heteropterous Hemiptera for reasons I shall 

 soon assign. From Mr. MacLeay I differ more widely, 

 which has resulted from our different ideas as to the 

 mode of tracing analogies ; his theory leading him to the 

 metamorphosis, and mine leading me a to the perfect insect, 

 for the foundation of our several systems. It remains that 

 I show how each of the pairs in my columns represent 

 each other : but I must observe, that the analogies exhi- 

 bited by insects in the corresponding Orders of these 

 columns are not equally striking in all their respective 

 members ; but only in certain individual species or ge- 

 nera, more or less numerous, by which the nearest ap- 

 proach is made to the contrasted forms. 



To begin with the Coleoptera and Heteropterous He- 

 miptera. Both are distinguished by having an ample 



a See above, p. 382. 



