SYSTEM OF INSECTS. 413 
metamorphosis,and mine leading me? to the perfect insect, 
for the foundation of our several systems. It remains that 
1 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 
prothorax, a conspicuous scutellum, the neuration of their 
wings, the substance of the hard part of their hemely- 
tra, which, as in Coleoptera, sometimes imitates horn 
and sometimes leather, and is occasionally, like elytra, 
lined with a hypoderma® ; the articulation of the head 
with the trunk is likewise the same in both*: and some 
Heteropterous species so strikingly resemble beetles (Ly- 
gus brevipennis Latr., &c.), having little or no mem- 
brane at the end of their hemelytra, that they might 
easily be mistaken for them. These circumstances prove, 
I think, that this suborder is more analogous to the 
Coleoptera than to the Orthoptera, with which it agrees 
in scarcely any respect but its metamorphosis. ‘The 
counterparts of this last Order indeed, instead of the 
Heteropterous, are to be sought for amongst the Homo- 
pterous Hemiptera, various species of which exhibit a 
most marked and multifarious analogy with numerous 
Orthoptera. Many of both Orders (Cicada Latr., Lo- 
custa L.), as you have heard long since, are signalized 
* See above, p 373—. > Vor. IL. pp. 373, 600. 
° Ibid. p, 413. 
