Coleopterological Notices, III. 165 



characters, the fifth segment in that sex being obtusely subangulate 

 at apex, without the slightest trace of the emargination which is 

 so extremely developed in brevis. There can be no doubt that the 

 specimen before me is a male, as the intromittent organ is well pro- 

 truded and the genital armature is deeply bilobed, the lobes acute 

 and tufted with coarse setae at apex. This abrupt and radical differ- 

 ence in the nature of the male sexual modification in two species 

 otherwise so similar, is quite unexpected. The anterior tarsus in 

 the male of theveneti is normal and not at all modified, with the 

 basal joint fully one-half as long as the remainder. 



C. pinguis Lee. — Smith. Cont. Know]., XI, 1859, p. 16 (Xystropus). — 

 Rather robust, oval, convex, intense black throughout ; lustre rather dull 

 and strongly alutaceous. Head small, feebly convex, finely, densely punctate, 

 the punctures all distinctly separated ; eyes small, separated by fully twice 

 their width ; antenna? scarcely one-half as long as the body, very stout, com- 

 pressed, serrate, the intermediate joints one-half longer than wide, the third 

 three times as long as the second and three-fourths as long as the fourth. 

 Prothorax short, nearly twice as wide as long, the apex truncate, fully one-half 

 as wide as the base, the latter transverse, broadly, rather strongly bisinuate ; 

 sides convergent and rather strongly, evenly arcuate from base to apex, becom- 

 ing almost parallel near the base ; disk not impressed, minutely but deeply, 

 very densely punctate, the punctures distinctly separated. Elytra about four 

 times as long as the prothorax, and, in the middle, about one-third wider ; 

 sides parallel and distinctly arcuate, especially behind, subcontinuous with 

 those of the prothorax, the humeral callus slightly longitudinally prominent ; 

 disk finely but rather strongly striate, the stria? finely but distinctly, rather 

 closely punctured, the intervals flat, minutely, feebly, densely punctate. 

 Abdomen minutely, evenly, rather closely punctured. Legs moderate, slender, 

 the basal joint of the hind tarsi equal in length to the remainder. Length 

 8.5 mm. ; width 4.0 mm. 



New Mexico. Cab. LeConte. 



This species which is represented only by the female is allied 

 rather closely to brevis, but is distinguishable by the black legs, 

 much shorter, more transverse prothorax and smaller eyes. 



C. opaca Lee. — Proc. Ac. Phil., 1859, p. 78. — Elongate-oval, intense black 

 throughout, dull and alutaceous. Head moderate, nearly flat above, finely, 

 densely, deeply punctate, the punctures all distinct ; eyes small, separated by 

 twice their width ; antenna? stout, compressed, strongly serrate internally, 

 scarcely more than one-half as long as the body, the fourth joint slightly 

 longer than the two preceding together. Prothorax fully two-thirds wider than 

 long ; sides strongly convergent from base to apex and strongly, evenly arcu- 

 ate, the apex truncate and less than one-half as wide as the base, the latter 



