CERPHERES.—CYLINDROCERINUS. 257 
ventral segment slightly depressed down the middle in the ¢. Prosternum with a deep, road, shining 
sulcus, which becomes narrower between the coxa, the latter separated by fully their own width. Femora 
feebly clavate, obsoletely grooved beneath. Tibi dilated at the outer apical angle. 
Length 5-31, breadth 13-12 millim. (¢ 9.) 
Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 
One pair. In this insect the surface is very finely alutaceous above and beneath, 
the elytra are rufescent, and the prosternal sulcus is broad and deep. C. rufescens is 
not unlike the N.-American Jdiostethus tubulatus (Lec.), from which it differs in the 
structure of the prosternum, the less prominent humeri, the minute tarsal claws, &c. 
CYLINDROCERINUS, gen. nov. 
Rostrum arcuate, not longer than the head and prothorax; mandibles short, decussate; antennal club ovate ; 
prothorax completely and abruptly tubulate in front; scutellum small, subquadrate, free; elytra much 
wider than the prothorax, subtriangular; pygidium covered by the elytra; prosternum with an oblong 
compressed cariniform prominence’ in front of each anterior coxa in the ¢, the coxe exserted and 
separated by about their own width; femora clavate, unarmed; tibie acutely dilated at the outer apical 
angle ; tarsal claws divergent ; body oblong-rhomboidal, polished, almost glabrous above. 
Type, C. tubsfer. 
This genus is based on a single species from Mexico which cannot be satisfactorily 
placed elsewhere. The prosternal prominences of the male are here reduced to two 
short oblong ridges (more conspicuous than in the same sex of Centrinus puncticollis, 
Boh.) ; the neck-like construction of the prothorax is very abrupt; and the mandibles 
are short and decussate. ‘The upper surface is glabrous, except for a patch of white 
scales at the base of the third interstice, such as is to be found in various species of 
Cylindrocerus, and in Gereus (Centrinus) distigma, Kirsch, and G. pilosus. The 
unique male is somewhat injured, and it is possible that the tip of the pygidium may 
be exposed in this sex. 
1. Cylindrocerinus tubifer, sp. n. (Tab. XIV. figg. 14, 144, 2.) 
Ovate, shining black, the tip of the rostrum ferruginous; an oblong spot at the base of the third elytral inter- 
stice, the prosternum, and the metathoraciec episterna, somewhat thickly clothed with small narrow white 
scales, the rest of the under surface and the legs sparsely set with minute, hair-like, white scales. Head 
sparsely, minutely punctate, transversely depressed between the eyes; rostrum arcuate, about as long as 
the head and prothorax, rather slender, thickened towards the base in the Q, finely punctate, with the 
apical portion smoother, the antenne in the ¢ inserted at a little beyond, and in the ¢ slightly behind, 
the middie, the antennal club ovate, the outer joints of the funiculus strongly transverse. Prothorax 
broader than long, rounded at the sides anteriorly, the anterior lobe narrow; sparsely, very finely punc- 
tate, except along the median line, and with a line of closely-placed coarser impressions along the basal 
margin and across the subapical constriction. Elytra deeply striate, the strie feebly punctate, the 
interstices almost flat, convex at the apex, with excessively minute scattered punctures, the third closely 
punctate at the base. Beneath closely, the median portion of the abdomen more sparsely, punctate. 
¢é. Prosternum tumid and with a compressed oblong prominence in front of each coxa, the intervening space 
shallowly excavate ; first ventral segment broadly excavate down the middle. 
Length 4-41, breadth 1,9,-2;4, millim. (¢ 9.) 
Hab. Mexico, Cuernavaca (Hége: ¢ ), Xucumanatlan (H. H. Sinith: @ ). 
Two specimens. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, May 1908. 2 LL 
