512 INSECTA. 



Camptocerus, T)e].^-Hylesinus, Fab. 



Where the antennae 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(l). 



Ploiotribus, Lat. — Hylesinus, Fab. 



The Ploiotribi are removed from all the other Insects of this fa- 

 mily by the club of their antennae, which is composed of three elon- 

 gated leaflets(2). 



Sometimes all the joints(3) of the tarsi are entire, and the club of 

 the antennae, always solid and compressed, commences at the sixth 

 or seventh joint. In 



ToMicus, Lat. — Ips, De Geer, — Bostrichus, Fab. * 



The antennae are not susceptible of being folded under the eyes, 

 and their club is distinctly annulated. The head is rounded above, 

 and almost glol)ular(4). 



There is an emargination on the side of the thorax. The tibiae 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(5). 



Platypus, Herbst. — Bostrichus^ Fab. 



The antennae, shorter than the head, fold under the eyes and ter- 

 minate in a very large club without distinct annuli. The body is li- 

 near, and the head cut vertically before; the eyes are almost round 

 and entire. The thorax is emarginated on each side to receive a por- 

 tion of the anterior thighs; the two anterior tibiae are divided on their 

 posterior face by transverse ridges; the tarsi are long and very slen- 



(1) Hylesinus asneipennis, Fab. 



(2) Lat., lb., p. 280. 



(3) 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 cylindri- 

 cal or linear. The antennae are very short. 



(4) Broadly trilobate behind. According to M- Dufour their chylific ventricle 

 which forms two thirds of the whole length of the alimentary canal, is covere 

 with papillae, while that of the Bostrichi is perfectly smooth. The same naturalis 

 has observed worms, resembling Ascarides, in the intestinal canal of the former 

 us well as in that of various other Coleoptera. 



(5) Lat, Gener. Crust, et Insect., II, p. 276. 



