COLEOPTERA. 91 
or less extent, which receives the proboscis, and even frequently the 
antenne. 
Those in which it does not exist may form two subgenera, viz. 
that of 
AMERHINUS, 
Where the body is oval or almost cylindrical and convex be- 
neath*; and that of 
Barivivs, 
Where it is depressed and rhom' oidal f. 
Those Rhyncheni of Fabricius, in which the sternum presents 
a cavity for the reception of the proboscis, have been arranged by 
M. Schenherr in a great many genera, which we will reduce in the 
following manner. 
They are either winged or apterous. 
Of the former, some are almost rhomboidal, with the thorax ab- 
ruptly narrowed in the manner of a tube near its anterior extremity ; 
the abdomen is almost triangular. They are connected with the 
Baridii. 
Here the antenne are composed of twelve joints. 
Camproruyncus—Evruinvs, Schenh. 
The Camptorhynci are distinguished from all the following sub- 
genera by their antennee, which, from the bend, form a thick, per- 
foliate club f. 
CENTRINUS, 
Where the scutellum is distinct, and the abdomen completely co- 
vered by the elytra; the eyes are remote, and the club of the antennze 
is elongated. There is frequently a tooth or horn on each side of 
the cavity of the pectus §. 
ZyGops, 
Where the eyes are very remaikzble. beirg extremely large and 
closely approximated or united superiorly, as well as the generally 
long legs, of which the posterior at least are very remote ||. 
CENTORHYNCHUS, 
Where the scutellum is hardly apparent, and the elytra, rounded 
at the extremity, do not entirely cover the abdomen. The eyes are 
remote. The club of the antenne is oval, and the extremity of the 
tibize is without spines 4. 
There, the antenne have but eleven joints. 
* The genera Amerhinus, Netarhinus, Alcides, Solenopus, of Scheenherr. 
+ The genera Rhinasius, Cholus, Dionychus, Plaiyonyx, Madarus, Baridius. 
t M. Kirby having already applied the name of Eurhinus to another genus of this 
family, it became necessary to change the denomination @f this one. 
§ See Schenherr. 
|| His genera Zygops, Mecopus, Lechriops. 
¥ His genera Centorhynchus, Mononychus. 
H2 
