Coleopterological Notices, III. 163 



and which is more closely allied to amoena than to any species of 

 the brevis group. 



Our species are comparatively few in number and may be dis- 

 tinguished by the following table : — 



Form oval or elliptical, rather strongly convex, the sides of the elytra more or 

 less evenly continuous with those of the prothorax. 

 Femora red. 



Broadly oval, the punctuation excessively minute ; antennae in the male 



distinctly shorter than the body "forevis 



Narrowly oval, the punctuation not so minute and quite distinct on the 

 head and pronotum under low power ; male antennas nearly as long as 



the entire body theveiieti 



Femora black. 



Third antennal joint of the female three times as long as the second ; 



prothorax nearly twice as wide as long pingllis 



Third joint in the female barely twice as long as the second ; prothorax 



distinctly less than twice as wide as long opaca 



Form oblong or oblong-elongate, the sides of the elytra straighter and not 

 evenly continuous with those of the prothorax. 

 Large species, the antennae long and unusually slender ; prothorax much 



less than twice as wide as long iiiargiiiata 



Smaller species ; antennae very stout, shorter, strongly compressed ; pro- 

 thorax short, more than twice as wide as long ; punctuation of the upper 

 surface unusually sparse amoena 



C. brevis Say. — Journ. Ac. Phil., Ill, 1823, p. 269 ; erythroptera Ziegl.: 

 Proc. Ac. Phil., II, 1844, p. 46 ; rufipes Melsh.: Cat. No. 518.— Elliptical, rather 

 strongly convex, feebly shining, alutaceous ; black throughout, the legs and 

 sometimes the entire elytra pale rufo-ferruginous ; entire upper surface ex- 

 cessively minutely, densely punctate. Head narrowly impressed along the 

 middle; eyes moderate ; antennae stout, strongly serrate internally. Prothorax 

 rather large, one-half to two-thirds wider than long ; apex truncate, one-half 

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

 strongly convergent from base to apex, broadly, evenly arcuate; disk unim- 

 pressed in the middle. Elytra nearly four times as long as the prothorax, 

 and, in the middle, quite distinctly wider, the sides very feebly arcuate and 

 subcontinuous with those of the prothorax, the humeral callus not quite as 

 prominent laterally as in pinguis; disk finely but deeply striate, the striae finely 

 but rather distinctly punctate ; intervals broadly, very feebly convex. Abdo- 

 men shining, finely, rather densely punctate. Legs slender, the basal joint of 

 the hind tarsi as long as the remainder. 



Male. — Eyes separated by slightly but distinctly more than their own width ; 

 antennae three-fourths as long as the body, joints nearly three times as long 

 as wide, third very short, not quite as long as wide, oblique at apex, fourth 

 twice as long as the two preceding together ; anterior tarsi compressed, com- 

 pact, the fifth joint thickened toward base, strongly bent ; fifth ventral segment 



