300 INSECTS. COLEOPTERA. 



B. Rostrum long ; head prolonged behind the eyes ; antennae with the joints elon- 

 gated, inserted in the males towards the middle of the rostrum. 



Gen. EUTRACHELUS. 

 2. Mandibles very small and not projecting. 



A. Rostrum not suddenly acuminated at the end in either sex, but a little widened 

 in the males. 



a. Head narrowed posteriorly, separated from the thorax by a strangulation ; anten- 

 nae granulated. 



Gen. BRENTUS, UROPTERUM. 



In the last of these genera the antennae of both sexes are inserted towards the mid- 

 dle of the rostrum. The elytra terminate abruptly in the form of a tail. 



b. Head fixed to the thorax behind the eyes, not narrowed posteriorly. 

 * Antennae moniliform. 



Gen. NEMOCEPHALUS. 



** Antennae with the joints linear. 



Gen. STERNORHYNCUS. 



B. Rostrum suddenly acuminated at the point in the males. 



a. Antennae long, with linear joints. 



Gen. BELORHYNCTJS. 



b. Antennae short, perfoliated. 



Gen. CLADIONE. 



II. Rostrum similar in both sexes, neither pointed nor widened at the end ; mandi- 

 bles not projecting j thorax trapezoidal. 



Jaws uncovered. 



Gen. RHINOTIA, Kirby, (Belus, Schcenh.) 



Gen. BRENTUS, Lat. Fab. Curculio, Lin. 

 Body elongated, linear ; two wings under the elytra ; antennae 

 moniliform, composed of eleven joints ; head elongated in the 

 form of a cylindrical beak, with the mouth at the extremity ; 

 thighs simple or dentated, with four joints in the tarsi. 



The insects of this genus are chiefly found in warm countries. 

 B. anchorago, Lat. Shining black ; thorax much elongated ; ely- 

 tra striated, with some yellow lines. Inhabits the Antilles. 

 Lat. Gen. ii. 243. 



TRIBE V. CURCULIONITES. 



Penult joint of the tarsi sometimes entire or slightly bilobed ; 

 antennae generally geniculate, almost always terminated in a 

 club, and the first joint received into a hollow or furrow ; 

 when straight and no furrow, they are inserted between the 

 eyes, or on the rostrum, with a club formed of the last joint ; 

 rostrum generally bent downwards. 



I. Antennae inserted near the point of a short and thick rostrum ; chin orbicular or 

 cordiform, covering the jaws ; mandibles entire or bidentated, often large, thick, 

 dilated exteriorly at their base ; and in the males sometimes a bent and pointed 

 prominence like a horn. 

 This division includes the genus Curculio and Brachycerus of Fabricius. 



1. Antennae geniculate, of eleven joints, of which the last three compose the club ; 

 penult joint of the tarsi bilobed. 



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