AMERICAN COLEOPTERA. 143 



Descriptions of some new North American COLEOPTERA. 



BY GEO. H. HORN, M. D. 



OMUS, Esch. 

 O. Lecontei, n. sp. — Black, shining. Head sparsely intricately rugulose, 

 frontal impressions shallow, deeply rugulose, clypeal region smooth. Thorax 

 trapezoidal, slightly broader in front than long, sides arcuate and gradually 

 convergent to base, anterior angles obtusely rounded, disc subdepressed at 

 sides rounded, lateral margin acute, very narrow and slightly reflexed; sur- 

 face feebly shining, intricately wrinkled, anterior transverse impression very 

 faint, median line nearly obsolete. Elytra elongate oval, sides arcuate in front 

 and gradually attenuate to apex, surface shining, and with large punctures, 

 each distinct and with scarcely evident foveate punctures, in a double series on 

 each elytron near the middle. Body beneath black, shining; thorax vermicu- 

 lately rugulose, sides of abdominal segments finely longitudinally strigose. 

 Terminal segment % deeply notched. Length .66 inch; 17 mm. 



This species is closely allied both to califomicus and Audouinii, but 

 diners very distinctly from either. The form of thorax is almost ex- 

 actly that of the former species, the sculpture is intermediate between 

 the two, being less deep than in califomicus while the thorax of 

 Audouinii is comparatively smooth. The elytra in the 

 above species is broadest behind the middle, (fig. 2) in 

 the present species (fig. 1) the greatest width is in front 

 of middle and behind this point they gradually become 

 narrower and at the same time are much less arcuate. 

 This latter character gives this species a totally different facies from 

 any other previously described. The punctuation of the elytra resem- 

 bles that of califomicus, but is less deep. In Audouinii the punctures 

 are of a less decided character and the intervals between them irregu- 

 larly elevated so that the punctures appear to become confluent. The 

 elytral sculpture is remarkably uniform in all the specimens of Omus 

 that have passed through my hands, scarcely any variation occurring 

 in many individuals of all the species examined. 



The specimens in my cabinet were collected by Mr. W. M. Gabb, 

 near Monterey, California. 



CYCHRUS, Fab. 

 C. rngiceps, n. sp. — Black, feebly shining. Head elongate, on side cari- 

 nate, between the insertion of the antennae deeply transversely impressed, ver- 

 tex moderately convex, irregularly rugoso-tuberculate. Thorax cordate, at 

 base moderately constricted, hind angles rectangular, sides feebly margined. 

 Elytra regularly oval, moderately convex, surface striate, striee punctured, in- 

 tervals convex, interrupted especially at sides. Epipleurse nearly smooth. 



