CLEODERES.—RHAPHTIRHYNCHUS. 53 
opportunity of examining any specimens from south of the Isthmus of Panama, so that 
I am not quite sure that our insect is really that intended by Boheman. Kirsch’s 
description of the anterior tibia of C. divittatus does not apply to our specimens. 
Group BELOPHERINA. 
Lacordaire distinguished this group from the Arrhenodina (Arrhenodides, Lac.) solely 
on account of the longer, more filiform antenne. It will not be possible to maintain 
the group unless other characters shall be discovered. 
RHAPHIRHYNCHUS. 
Rhaphirhynchus, Schénherr, Gen. Cure. v. p. 504 (1840). 
Raphirhynchus, Lacordaire, Gen. Col. vii. p. 436. 
Rhaphidorrhynchus, Gemminger and Harold, Cat. Col. ix. p. 2711. 
This genus has recently been revised by Dr. Senna, who considers it to consist of 
fifteen species found in South and Central America. 
It is doubtful whether the genus can be satisfactorily distinguished from the 
Antillean Belophorus: the character chiefly relied on by Schénherr was the absence of . 
apical dilatation of the sides of the tip of the rostrum of the male; this, however, 
is exhibited in a rudimentary form by certain Rhaphirhynchi—e. g. R. auricollis 
and R. linearis—becomes quite well-marked in R. severini, and in R. principalis is 
conspicuous. 
The Rhaphirhynchi seem to be rarely met with in any numbers, and the species are 
difficult to distinguish. I have before me representatives of nineteen species, and if 
Dr. Senna’s localities may be relied on—which is not clear in certain cases, they being 
taken from old records—several other South-American species occur in our region. In 
the arrangement of the species I have followed, on the whole, the system of Dr. Senna ; 
I find it impossible to make a dichotomous table that would be satisfactory, the males 
of some of our species being unknown to me. The characters to be looked at are, in 
the first place, the sculpture of the elytra, and whether the male has a projecting process 
on the underside of the first joint of the antenna or not. The length and width 
of the head are also of great importance, and the yellow marks on the elytra, though 
differing from species to species, do not, apparently, vary much in the same species. 
1. Rhaphirhynchus sexvittatus. 
Rhaphidorrhynchus sexvittatus, Senna, Ann. Soc. Ent. Belg. 1894, p. 596°. 
Hab. Mexico, Santecomapan (Sallé) ; GuaremaA, Yzabal (Sal/é), Chaco} (Champion) ; 
Nicaragua, Chontales (Belt, Janson); Panama, Chiriqui '. 
This is a remarkable and very rare species ; judging from the few examples we have 
