764 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



thorax tapers less rapidly, and the elytra are not striate. The head is 

 badly preserved, being crowded under the thorax ; it appears, how- 

 ever, to be very small, about half as broad as the thorax, with a 

 broadly rounded front, large eyes, and a dark color. The thorax is 

 about two and a half times broader than long, with slightly convex sides, 

 regularly tapering toward the apex, but not so rapidly as would seem to 

 be required for so proportionally narrow a head; the front border broadly 

 concave, the hind border very obtusely angulate, scarcely produced as a 

 broad triangle in the middle ; the surface is of a light color, very minutely 

 and profusely punctulate, the hind borders faintly marginate, the mar- 

 gin black and punctate. The elytra are more elongate than, and do not 

 taper so rapidly as, in M. sanguinipennis ; they are of the color of the 

 thorax, even more delicately punctulate than it, with two small, short, 

 black, longitudinal, impressed dashes just outside the middle, and just 

 before the end of the basal third ; the basal edge of the elytra is marked 

 in black, much as the posterior border of the pronotum ; and the scutel- 

 lum is small, owing to the encroachment of the median prolongation of 

 the prothorax. 



Total length S.S™"^; length of thorax 0.6™'", of elytra 2.5'°™; breadth of 

 head 0.75™™, of thorax in front 1.2™™, behind 1.45™™, of elytra at the 



spots 2.1™™. 



CHEYSOMELID^. 



Cryptoceplialus vetustiis. — This species is fairly represented by a pair 

 of specimens with their reverses (Nos. 4003, 4004; 4039, 4044). One pair 

 exhibits the front, and, by the drooping of the abdomen, the under surface 

 of the insect with expanded elytra (one of them curiously foreshortened), 

 the other the under surface only. The insect is broadly oval, and, 

 except in being much stouter, closely resembles G, venustus Fabr., with 

 which it agrees in size. The thorax, as seen on a front view, is arched, 

 and the proportion of the head to the thorax is as in the recent species 

 mentioned. The elytra, which are the part best preserved, are rounded 

 at the extremity, and are furnished with ten slightly arcuate rows of 

 gentle punctures, arranged inconspicuously in pairs, besides a sutural, 

 slightly oblique row on the basal third of the elytra, terminating in the 

 margin. This disposition of the punctures and the character of the 

 head, sunken, as it were, into the thoracic mass, leave little doubt that 

 the insect should be referred to Cry otocephalus. The elytra are of a 

 uniform light horn-color, but the body is darker. The body is more 

 oval than in the parallel-sided G. venustus. 



Length of body 4-4.5™™; breadth of same 2.6-3.2™™; length of elytra 

 4™™; breadth of one of them LS'"". 



RHYNCHITID^i. 



Uugnamptus decemsatus. — A single elytron (No. 4046) with a broken base 

 is all that remains of this species. But this is peculiar on account of 

 the supplementary humeral stria, which seems to be common in the Ehyn- 



