180 GEO. H. HORN, M. D. 



The species here included are five in number. 

 Elytral striae not exceeding 14 in number interruptus. 



Elytral striae 16 — 18 in number. 

 Sides of thorax posteriorly oblique obliquus. 



Sides of thorax posteriorly sinuate. 

 Elytra striate punctures rather fine. 



Thorax usually longer than wide, feebly sinuate posteriorly, margin very 

 narrow and very feebly or not at all reflexed, elytral striae scarcely at 



all confused at the sides striatus. 



Thorax wider than long, sides posteriorly deeply sinuate, margin wider 

 and distinctly reflexed, outer three or four elytral striae much confused 



behind the middle veiitricosus. 



Elytra with extremely fine striae punctures large minius. 



C interruptus Menet., Bull. Ac. Petrop. 1844, ii, p. 54; Motsch. Bull. 

 Mosc. 1859, iii, p. 162, pi. 3, fig. 10; ventricosus I Motsch. Bull. Mosc. 1845, iv, 

 p. 338 ; 1859, iii, p. 162, pi. 3, fig. 9 ; constrictus Lee. Trans. Am. Philos. Soc. 1853, 

 p. 398. — Form moderately robust, black, shining. Head moderately elongate, 

 smooth, frontal margin with slight longitudinal impression, gense rather deeply 

 incised. Thorax broadly cordiform, sides arcuate in front, deeply sinuate pos- 

 teriorly, hind angles rectangular, disc feebly convex, impressions moderate. 

 Elytra rather broadly oval, convex, margin narrowly reflexed, disc deeply 

 14-striate, striae with coarse deep punctures invading the intervals, the latter 

 convex and smooth, inflexed portion of the elytra sparsely obsoletely punctate. 

 Body beneath smooth, shining. Length .56 — .64 inch; 14 — 16 mm. 



This species in common with nearly all in the sub<z:enus has given 

 considerable trouble in its proper definition. With both sexes the 

 diflBculty is narrowed down to its separation from venfricosus, from 

 which it may be known by the lesser number of the elytral striae 

 with those at the sides, entire or very nearly so. Its smaller size and 

 more constricted thorax are also tolerably constant characters. It also 

 resembles in form (Ussobdus, but the form of thorax, in the absence 

 of the male, will separate it. 



The species determined by Motschulsky to be this, and so figured, 

 is undoubtedly correct, the second reference may be in doubt, as his 

 very bad figure vaguely represents one of the many variations of 

 ventricosus in my cabinet, although I do not believe that he would 

 have considered one the female of the other without good reason, for 

 with all his synonymical faults he was a close observer. 

 Occurs at San Mateo, California, and rather common. 

 C. obliquus Lee, Trans. Am. Ent. Soc. 1868, p. 61.— Form moderately 

 robust, black, slightly shining. Head moderately elongate, genae feebly notched 

 or sinuate. Thorax cordate, as wide as long, sides in front arcuate, posteriorly 

 oblique, not sinuate, disc feebly convex, impressions feeble. Elytra rather 

 broadly oval, convex, deeply striate, striae punctured, intervals feebly convex, 

 somewhat interrupted at the sides and apex, inflexed portion sparsely punctate. 

 Body beneath smooth, shining. Length .54 — .64 inch ; 13.5 — 16 mm. 



