Ceuthorrhynchina.] RHYNCHOPHORA. 333 



have in several cases a tendency to nm 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 ; on 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 



coxae as the coxae themselves and deeply incised 



at throat. 

 i. Onychinm terminated by a single claw ; scape 



half as long as the funicnlus MoNONTCHUS, Schonh. 



ii. Onychium terminated by two claws ; scape, as 

 a rule, as long as the funiculus. 



1. Eighth joint of-the antennae independent of 

 the club and resembling the preceding joint ; 



fnniculus consisting of seven joints. 



A. Pectoral channel for the reception of the 

 rostrum continued to or beyond apex of the 

 intermediate coxae and terminating in a 

 more or less prolonged excavation on the 



metasternum CCBLIODES, Schonh. 



B. Pectoral channel for the reception of the 

 rostrum sometimes absent, sometimes con- 

 tinued between anterior coxae, but very 



rarely attaining the metasternum. 



a. Lateral border of elytra not strongly cut 

 back at shoulders ; form elongate, oblong- 

 ovate PooFHAOua, Schonh. 



b. Lateral border of elytra cut back deeply 

 and angularly at shoulders ; form short 



and broad, ovate CEUTHOBBHYifCHUS, Dutal. 



2. Eighth joint of the antennae 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 CEUTHOBBHYXCHrDIUS, 



Duval. 



b. Form longer, oblong ; anterior lobe of 

 episterna of metasternum not reaching 



the tenth stria of the elytra .... TAPINOTTTS, Schonh. 



B. Lateral border of elytra not strongly cut 

 back at shoulders ; interstices narrow and 



subcostiform ; form short, subglobose . - . RHTTIDOSOMUS, Schonh. 



II. Prosternum before the anterior coiae reduced to 

 a narrow border which is truncate or broadly 

 emarginate at throat. 



5. Funiculus of antenna? consisting of seven joints; 



prostcrnum broad between the anterior coxae . RniHOKCUS, Steph. 

 ii. Funiculus of antennae consisting of six joints; 



