COLEOPTERA. 59 
These Insects are connected on the one hand with the Helopii, and 
on the other, with the Gidemerze, and still more closely with Nothus, 
a subgenus of the same tribe: such are the principles which have 
guided us in the division of this family. 
In some, the antennz are approximated to the eyes, and the head 
is not prolonged in the manner of a proboscis, but terminated at most 
by a very short snout. They will form our four first tribes. 
Those of the first or the Hezoru, have their antennze covered at 
base by the margin of the head; they are generally filiform or slightly 
thickened towards the extremity, generally composed of almost 
cylindrical joints attenuated at base, of which the penultimate ones 
are frequently a little shorter, and in the form of a reversed cone, and 
the last is usually almost ovoid; the third is always elongated. The 
extremity of the mandibles is bifid; the last joint of the maxillary 
palpi is larger and securiform, or in the figure of a reversed triangle ; 
the eyes are oblong, and reniform or emarginated. None of the legs 
are fitted for leaping; the penultimate joint of the tarsi, or at least of 
the last ones, is almost always entire or not deeply emarginate ; their 
terminal hooks are simple, or without fissure or dentation; the body 
is most commonly arcuated above, and always solid and firm. 
Such of the larve as are known to us are smooth, filiform and 
glossy, with very short legs, like that ofa Tenebrio. They are found 
in old wood, and the perfect Insect lives under the bark of trees. 
This tribe mostly corresponds to the genus 
He tors, Fab. 
In some, the body is alsoelliptical, strongly arcuated above, or 
very convex; the antennze, at most, as long as the thorax, com- 
pressed, and dilated like the teeth of a saw towards the extremity; the 
thorax is transversal, plane above, either trapezoidal and becoming 
widened posteriorly, or almost square; and the elytra frequently ter- 
minate in a point or by a tooth. ‘The posterior extremity of the 
presternum projects in a little point, which is received into a forked 
emargination of the mesosternum, 
In these the mentum is broad, and conceals ths origin of the max- 
ille. The middle of the posterior extremity of the thorax projects 
along the side of the scutellum in the manner of an angle. Such is 
the 
' Epitracus, Lat.* 
In the others the mentum does not cover the base of the maxille, 
and the posterior margin of the thorax is straight, or but slightly 
dilated behind. 
* Lat., Gener. Crust. et Insect., II, p. 183, and I, x, 1. The maxille are un- 
guiculated like those of Melasoma. This subgenus and the two following subgenera 
are peculiar to South Ameriea. 
F2 
