614 EXTERNAL ANATOMY OF INSECTS. 



may be stated as rather resembling leather than horn ; on 

 this account this part of a hemetytrum is denominated the 

 corium. In Scutellera the portion covered by the scu- 

 tellum is membranous ; and in Acanthia paradoxa, and 

 the cucullated species of Tingis, the wing-covers are en- 

 tirely so. The apex of these organs is almost universally 

 either membranous or coriaceo-membranous, on which 

 account it is called the membrana. I say almost, because 

 in Aradus and the Hydrocarisce Latr., this part, though 

 rather thinner than the rest of the Hemelytrum, is also 

 coriaceous ; in the latter tribe usually with a very narrow 

 membranous edge ; and in many Reduvii and Zeli there 

 is scarcely any difference in the substance of the base and 

 apex. 



2. As to the articulation of Hemelytra with the trunk, it 

 seems not strikingly different from that of tegmina : the 

 point or base of the Intermediate Area, which falls short 

 of that of the lateral areas, seems connected by a slender 

 ligamentous piece, with its axis, which is thick; and I do 

 not discern Chabrier's humerus shaped like a swan's head 

 and neck a 



3. The composition of these organs differs from that of 

 tegmina in more respects than one : in the first place, they 

 consist, as was lately observed, of fmir instead of three 

 areas ; in the next, they appear to have, at least several 

 of them, a part, which I suspect to be analogous to that 

 above described in Coleoptera, supposed to represent the 

 phialum of wings b . I shall first speak of the area* In 

 some apterous species related to the bed-bug, Lygceus 

 brevicollis Latr. c , &c, there is no trace of the usual areas, 



a See ab °ve> P- 607. b i b i d . p< 600> 



' My insect, which nearly resembles the Coleopterous genus Cery 



