COLEOPTERA 89 
origin of the mandibles, and frequently near the middle of the probos- 
cis, which is usually long, comprise, with some exceptions, the genus 
Livus, Rhynchenus,and Calandra of Fabricius. 
In the two first the antenne present ten joints at least, but most 
commonly eleven or twelve, of which the three last at least form the 
club. 
Lixvs, Fab. 
The Lixi almost resemble the Cleoni in their organs of manducation, 
as well asin the elongated fusiform club of their antennz, the narrow 
and elongated figure of their body, and the armature of their tibie. 
The L. paraplecticus, whose larva lives in the stem of the Phellan- 
drium and produces in Horses which swallow it with the plant the 
disease called paraplegia, is almost linear. Another species, for which 
a particular genus—Ahinocil/us—has been formed on account of its 
having but very slightly geniculate antenna, is reputed an odon- 
talgic *. 
Ruyncuanvs, Fab. 
The Rhyncheni present no such ensemble of characters. 
Sometimes the legs are contiguous at base, and there is no sternal 
fossula for the reception of the proboscis. 
Some never leap, and their attennze are composed of eleven or 
twelve joints. These are winged. 
TAMNOPHILUS. 
The tamnophili, in which the antenne are but slightly geniculate, 
short, composed of twelve joints terminated by an oval club, and 
placed on a short, projecting, and but slightly arcuated proboscis, 
where the eyes are approximated superiorly, the extremity of the 
abdomen is exposed, and the tibize are armed at the extremity with 
a stout hook, will form this first subgenus, which we must distin- 
guish from that of Rhinus (Aine), with which Olivier and myself 
confounded it f. 
Other Rhyncheeni are remarkable for their arcuated tibie, fur- 
nished with a stout hook at the end; their tarsi are long, filiform, 
but scantily provided with hair beneath, and the penultimate joint 
is but very little dilated and simply cordiform, They will compose 
the subgenus 
Bacovus. 
Small Insects which are found in marshes f. 
Some others with the same habits are removed from their conge- 
ners by their tarsi, of which the penultimate joint completely encloses 
the last between its lobes. The last one is frequently destitute of 
hooks. They will be comprised in the subgenus 
* The genera Rhinocillus, Lachneus, Nerthops, Larinus, Lixus, Pacholenus of Scheen- 
herr. The sexual organs of the Lixi presented characters to M. Dufour not ob- 
served by him in any other Coleoptera. 
+ The genera Lemosaceus, Tamnophilus, of the same. 
} The genera Bagous, Hydronomus, Lyprus, of the same. 
VOL. IY. H 
