1-22 system of insects. 
MacLeay. 
Mandibulata. Haustellata. 
Trichoptera Lepidoptera 
Hy menoptera 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. 
