612 EXTERNAL ANATOMY OF INSECTS. 
it is lined with a hypoderma like elytra; and in many the 
points, which are impressed upon it, also perforate the 
hemelytrum, and seem to act as pores: but in Lygeus, 
Reduvius, Capsus, Miris, and the majority of the Hetero- 
pterous Hemiptera, the organs in question being soft and 
flexible, may be stated as rather resembling leather than 
horn ;—on this account this part of a hemelytrum is de- 
nominated the coriwm. In Scutellera the portion covered 
by the scutellum is membranous; and in Coreus para- 
doxus, and the cucullated species of Tingis, the wing- 
covers are intirely so. ‘The apex of these organs is al- 
most universally either membranous or coriaceo-mem- 
branous, on which account it is called the membrana. I 
say almost, because in Aradus and the Hydrocorise, 
this part, though rather thinner than the rest of the 
Hemelytrum, is also coriaceous; in the latter tribe usu- 
ally with a very narrow membranous edge; and in many 
Reduvit and eli 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?. 
3. The composition of these organs differs from that 
of ¢egmina in more respects than one: in the first place, 
they consist, as was lately observed, of four instead of 
three areas; in the next, they appear to have, at least 
genera, the Hemelytra are more substantial than in the subsequent 
tribes. * See above, p. 605. 
