Ceuthorrhynchina. | RHYNCHOPHORA. 333 
have in several cases a tendency to run into one another, and have, in 
fact, been differently described in some cases by different authors, I 
was, at first, as I have before stated, strongly inclined to adopt Bedel’s 
arrangement of the genera ; ou further consideration, however, I have 
come to the conclusion that this arrangement would probably be very 
confusing, and that it is the best plan to keep to the genera that have 
been hitherto usually accepted ; it is quite possible that the synthesis 
of the genera may be adopted, but the whole question regarding the 
constitution of the tribe is very far from being settled. 
I. Prosternum at least as long before the anterior 
cox as the cox themselves and deeply incised 
at throat. 
i, Onychium terminated by a single claw ; ae 
halfas long as the funiculus. . . . . Mononycuvts, Schinh. 
ii, Onychium terminated by two claws; scape, as 
a rule, as long as the funiculus. 
1. Eighth joint of the antennz independent of 
the club and resembling the preceding joint ; 
funiculus consisting of seven joints. 
A. Pectoral channel for the reception of the 
rostrum continued to or beyond apex of the 
intermediate coxee and terminating in a 
more or less prolonged excavation on the 
metasternum. . C@LIoDES, Schonh. 
B. Pectoral channel for ‘the reception ‘of ‘the 
rostrum sometimes absent, sometimes con- 
tinued between anterior coxe, but very 
rarely attaining the metasternum. 
a. Lateral border of elytra not strongly cut 
back at shoulders ; form elongate, oblong- 
ovate . PoorHaaus, Schinh. 
b. Lateral border of elytra cut back deeply 
and angularly at shoulders; form poise 
and broad, ovate . . CEUTHORRHYNOHDS, Duval. 
2. Highth joint of the antenna included in ‘the ' 
club ; funiculus consisting of six joints. 
A. Lateral border of elytra cut back angularly 
at shoulders. 
a. Form short, ovate; anterior lobe of 
episterna of metasternum reaching the 
tenth stria of the elytra . . . . . . CEUTHORRHYNCHIDIUS, 
Duval. 
b. Form longer, oblong ; anterior lobe of 
episterna of metasternum not a pros 
the tenth stria of the elytra . . TaPinotvs, Schonh. 
B. Lateral border of elytra not strongly | cut 
back at shoulders; interstices narrow and 
subcostiform ; form short, subglobose . . RuyTIDOsoMus, Schinh. 
II. Prosternum before the anterior coxe reduced to 
a narrow border which is truncate or broadly 
emarginate at throat. 
i. Funiculus of antenne consisting of seven joints; 
prosternum broad between the anterior coxe . RHINONCUS, Steph. 
ii. Funiculus of antenne consisting of six joints ; 
