SYSTEM OF INSECTS. 423 



c 



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 a ; the articulation of the head 

 with the trunk is likewise the same in both b : and some 

 Heteropterous species so strikingly resemble beetles 

 (Lygceus, 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, Locusta), 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 tegmina, but sometimes in both they are nearly 

 membranous, like wings. In Centrotus and Acrydium, 

 the one Homopterous and the other Orthopterous, the 

 front is bilobed, the eyes are small ; there are only two 



a VOL. HI. pp. 372, 598. b Ibid. p. 412. 



c VOL, II. p. 397. " VOL. III. p. 413. 



