EXTERNAL ANATOMY OF INSECTS. 561 
immediately follows the antepectus ; on each side it is 
limited by the scapulars, and behind by the mid-legs and — 
mesosternum. Its antagonist above is usually the darso- 
lum. In the Coleoptera Order it varies occasionally, 
both in form and magnitude, but not so as to merit par- 
ticular notice, except that both are regulated by the sca- 
pulars—if these are small, the peristethium is ample; 
and, vice versa, if they are large it is small. In all the 
following Orders, except the Hymenoptera, it is equally 
inconspicuous, but in them it is often more remarkable. 
I have a Brazilian species of Cimbex (C. mammifera 
K. MS.) which appears undescribed, in which this part 
swellsinto two breast-like protuberances, terminating pos- 
teriorly in membrane, as if it had separate motion: in the 
golden-wasps (Chryszs) it is anteriorly concave to receive 
the core of the mid-legs; and in Sé/bum, of the same 
tribe, it is armed with one or more conical obtuse teeth. 
7. Scapularia*. ‘The scapulars are situated between 
the cove of the mid-legs and the base or axis of the up- 
per organs of flight, and they seem to act as a fulcrum 
to each. In the Coleoptera Order they are most com- 
monly quadrangular or subquadrangular, often divided 
diagonally, and sometimes transversely, by an impressed 
line; the posterior part, which is usually the most ele- 
vated and often has an uneven angular surface, is that 
which intervenes between the coxee and elytra: where 
the former are short, as in the Capricorn beetles, the 
thorax of insects, consisting of several pieces that follow each other, 
and the vertebral column ; between their three sternwms and the ster- 
num, and between their other pieces and the ribs of vertebrate 
animals, Comp. Chabrier, ui supr, c. iv. 49. nete 1. 
* Prares VAL IX Yo: 
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