RHAPHIRHYNCHUS. 55 
rows of regular round punctures are placed on an opaque minutely sculptured surface, 
and are separated from one another by elongate intervals, while the longitudinal intervals 
are more or less elevated, the black portions thereof being less swollen, as it were, than 
the yellow. These yellow portions consist of the larger part of the third interstice, 
there being, however, on it an interruption of considerable extent in the middle ; on the 
fourth interstice there is a yellow mark by the side of the black interruption on the 
third interstice ; the eighth interstice is yellow for the greater part of the length. The 
thorax is remarkably elongate, and on the anterior part of the upper surface there are 
some small transverse asperities in each sex; in the male the flanks are also strigose 
transversely. The antenne in this sex are very remarkable, there being a large 
descending process on the first joint, while the next four joints are made hollow and 
impressed beneath. The under surface of the metarostrum has no foveoles in either 
sex. The apices of the elytra are truncate, nearly straight, the outer angle being only 
very slightly prominent. 
Although this species has an opaque appearance on the elytra, this is not due, as in 
the case of R. sexvittatus, to tomentum, but to a minute sculpture, with which, in 
addition to the usual coarser sculpture, the surface is covered. 
5. Rhaphirhynchus signifer. 
Rhaphirhynchus signifer, Boh. in Schénh. Gen. Cure. v. p. 505°. 
Rhaphidorrhynchus signifer, Senna, Ann. Soc. Ent. Belg. 1894, p. 600°. 
Hab. Mexico }?. 
This is a rusty-red insect, with toothed elytral apices, and was described apparently 
from a single example of the male sex. It is unknown to me, as well as to Dr. Senna. 
6. Rhaphirhynchus principalis, sp.n. (Tab. II. fig. 19.) 
3. Nigro-eneus ; elytris nigris, flavo-lineatis ; rostro elongato, apice dilatato ; antennis pedibusque anterioribus 
perelongatis; elytris ad suturam tristriatis, externe seriatim punctatis. 
Long. 27 millim. 
Hab. Guatemata (Conradt). 
Antenne very long, the first three joints spinose beneath. Rostrum very long, the 
asperities of its upper surface strongly marked, at the tip rather broadly dilated on each 
side into an angle, which is turned upwards; the mandibles quite short, but exposed at 
the tip of the rostrum; metarostrum sulcate. Thorax very long, much narrowed in 
front, dull, brassy. Elytra one and a half times as long as the thorax ; next the suture 
with three moderately deep striz, outside this with series of rather fine punctures ; 
extremity with a short, broad tooth at each outer angle, and at the suture with a 
small common angular emargination ; they are marked with yellow as follows :—third 
interstice entirely yellow, except for two interruptions and a small space at the tip; 
