COLEOPTERA. 95 
all or but slightly compressed, and annulated transversely; the body 
is almost cylindrical *. 
Hyvesinus, Fab. 
Where the club of the antennz is also terminated in a solid club, 
but slightly or not at all compressed, and annulated transversely, but 
tapering toa point. The body is almost ovoid ft. 
In the two following subgenera this club is still solid, but strongly 
compressed ; its inferior joints form concentric curves. In 
Scotytus, Geoffi—Hy.ezsinus, Fab—Kccorroeaster, Herbst. 
Gyllenh., 
Or Scolytus properly so called, the antenne are straight, beardless, 
and inserted close to the inner margin of the eyes, which are narrow, 
elongated, and vertical f. 
Camptocerus, Dej.—Hy.esinus, Fab. 
Where the antenne of the males are strongly geniculate and fur- 
nished exteriorly with long hairs or threads; they are inserted at a 
considerable distance from the eyes, which are elliptical and ob- 
lique §. 
Proiorrievs, Lat—Hyvesinus, Fab. 
The Ploiotribi are removed from all the other Insects of this family 
by the club of their antennee, which is composed of three elongated 
leaflets ||. 
Sometimes all the joints J of the tarsi are entire, and the club of the 
antenne, always solid and compressed, commences at the sixth or 
seventh joint. In 
Tomicus, Lat.—Ips, De Geer,—Bosrricavs, Fab., 
The antenne are not susceptible of being folded under the eyes, 
and their club is distinctly annulated. The head is rounded above, 
and almost globular **. 
There is an emargination of the side of the thorax. The tibiz are 
not striated. The tarsi, at most, are as long as the latter, with the 
first joint but slightly elongated. The body is cylindrical, and the 
eyes are elongated and somewhat emarginated +f. 
* Lat., Gener. Crust. et Insect., II, p. 274; Gyll., Insect., Suec., IV, p. 618. 
+ Lat., Ib., p. 279. 
t Lat., Ib., p. 278; Gyll., Insect. Suec., III, p. 215, and IV, p. 279. 
§ Hylesinus eneipennis, Fab. 
|| Lat., Ib., p. 280. 
§ They appear to be five in number; the penultimate is very small. The two 
posterior legs are very remote from the preceding ones, and the body is cylindrical 
or linear. The antennz are very short. 
** Broadly trilobate behind. According to M. Dufour their chylific ventricle, which 
forms two thirds of the whole length of the alimentary canal, is covered with papille, 
while that of the Bostrichi is perfectly smooth. The same naturalist has observed 
worms, resembling Ascarides, in the intestinal canal of the former, as well as in that 
of various other Coleoptera. 
+t Lat., Gener. Crust. et Insect., II, p. 276. 
