46 INSECTA. 
of those four principal corneous or connivent pieces of which it is 
composed in the preceding tribe, but by the approximation of its in- 
terior fleshy columns. The chylific ventricle is proportionally longer, 
and the spermatic capsules are lessnumerous. These Insects, accord- 
ing to the same naturalist, are provided with a double excremen- 
titious secreting apparatus, totally differing in structure from that of 
the Pentamera. It consists of two tolerably large oblong bladders, 
situated altogether under the viscera of digestion and generation, 
closely approximated to each other, with extremely thin parietes, and 
surrounded with adhering vascular folds more or less turgid; the 
precise point of their insertion, from the utter impossibility of unroll- 
ing them, can scarcely be determined. ‘The same remark applies to 
the canals by which the secreted liquid is evacuated; they are con- 
cealed by a sort of membranous diaphragm, which, by means of a 
fleshy panicle, is applied to the last segment of the venter. The se- 
creted fluid issues laterally from the last annulus, and not from its 
extremity; it is ejected to the distance of seven or eight inches, is 
brownish, acrid, extremely irritating, and has a peculiar and pene- 
trating odour. 
This tribe is formed of a single genus, that of 
Buaps. 
Those, in which the body is generally oblong, with the abdomen 
clasped laterally by the elytra, that are most usually narrowed towards 
the end, and terminated ina point or in the manner of a tail, and in 
which the tarsi are almost similar in the two sexes, and without any 
notable dilatation, will form our first division. 
The mentum in some is small, or hardly occupying in width more 
than the third of that of the under part of the head, and almost square 
or orbicular. 
Here, all the tibize are slender, without strong ridges or teeth on 
the outer side. The thorax is never dilated anteriorly, nor in the 
form of a widely truncated heart. In 
‘ Oxura, Airb., 
The body is narrow and elongated; the thorax longer than it is wide, 
ovoid, and truncated at both ends; and the intermediate joints of the 
antennze long and cylindrical*. In 
AcanTHomerA, Lat.——Pimeuia, Fab., * 
The thorax is almost orbicular and transversal; the abdomen nearly 
globular; the third joint of the antennze cylindrical and much longer 
than the following ones, which are almost of the same form, and the 
three last at most granose }. 
* Ozura setosa, Kirby, Lin. Trans., XII, xxii, 3. 
-- Pimelia dentipes, Fab., and some other species. The anterior thighs are inflated 
and dentated; the body is very unequal and cinereous; the spurs of the tibie very 
m all. 
