SYSTEM OF INSECTS. 423 
prothorax, a conspicuous scutellum, the nen ration 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 a ; the articulation of the head 
with the trunk is likewise the same in both b : and some 
Heteropterous species so strikingly resemble beetles 
(Lygccus, brevipennis &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, Locust a), as 
you have heard long since, are signalized by possessing 
the same powers of song, and produced by an analogous 
organ c : a large proportion also of both are endued 
with wonderful saltatorious powers, and their posterior 
tibias are similarly armed ; their legs in general likewise 
are longitudinally angular, and the head in both articu- 
lates with the trunk in the same manner d . In both 
Orders too, the upper organs of flight are most com- 
monly tegmifia, but sometimes in both they are nearly 
membranous, like *wi?igs. In Centrotus and Acrydium, 
the one Homopterous and the other Orthopterous, the 
front is bilobed, the eyes are small ; there are only two 
' Vol. III. pp. 372, 598. b Ibid. p. 412. 
c Vol. II. p. 397—. '' Vol. HI. p. 413. 
