bo 
RHYNCHOPHORA. 
CRATOSOMUS. 
Cratosomus, Schénherr, Cure. Disp. Meth. p. 278 (1826); Gen. Cure. iv. p. 1; Lacordaire, Gen. 
Col. vii. p. 145. 
Gorgus, Schénherr, Cure. Disp. Meth. p. 279. 
A Tropical-American genus, including many species of large size, a few of which 
are peculiar to the region now under investigation: C. punctulatus is a common 
insect in Mexico, but the others are all rare or local, with the exception of C. gemmatus. 
Some of the South-American forms belonging to Schénherr’s second group have a long 
curved spine on each side of the rostrum in the male, in which sex also the pygidium 
is more broadly exposed than in the female, whereas in C. punctulatus and other 
members of his first group the pygidium is broadly exposed in both sexes. Fresh 
examples of certain species, C. pulverulentus, &c., are coated with a mealy secretion, 
as in Livus, Larinus, &c. 
a. Femora unidentate, the anterior pair sometimes unarmed. 
a’. Rostrum short, feebly curved, not dentate at the sides in the ¢; eyes 
comparatively small, distant ; femora sharply annulate; pygidium 
broadly exposed in both sexes. 
a’, Prothorax and elytra sparsely, conspicuously tuberculate ; the pallid 
vestiture of the prothorax reduced to two patches at the base and 
a line along the anterior margin . . . . . . . . .) . ) .) a@nnulipes, sp. n. 
6°. Prothorax not or feebly, and the elytra distinctly *, tuberculate ; 
the pallid vestiture of the prothorax separating or surrounding the 
usually more or less confluent black spots on the dise . . . . punctulatus, Gyll. 
ce’. Prothorax not, and the elytra sparsely, tuberculate ; the prothorax 
with a transverse black median fascia, the rest of the vestiture 
dense and yellowish. ©. 2 2. 1. 2 2. 1 ws dafontii, Guér. 
6‘. Rostrum longer and more curved, sometimes feebly dentate at the 
sides in the ¢; eyes very large, subcontiguous or narrowly separated; 
femora not annulate; pygidium of the $ broadly, and that of the 
narrowly, exposed f. 
a’. Prothorax and elytra finely tuberculate . . . 2... . gemmatus, Lec. 
e*. Prothorax and elytra with long, stout, conical tubercles, the elytra 
bideutate at the apex . 2. 2. we. spicatus, sp. D. 
J. Prothorax granulate or punctate ¢. 
a’. Elytra with a very large conical tubercle on the third interstice 
and another large tubercle at the shoulder. 
a’. Prothorax granulate; elytra seriato-foveolate. . . . . augustus, sp. n. 
6'. Prothorax punctate; elytra seriate-punctate . . . . ., pulverulentus, sp. n. 
* The tubercles few in number in the var. 7. 
T The two sexes of C. gemmatus and C. cuneatus only are available for examination. 
+ In C. aspersus there is a short tuberculiform carina on the disc, 
