NORTH AMERICAN COLEOPTERA. 273 



This species is so like subciipreus that it might be mistaken for 

 some of the smaller and smoother forms. The characters of the 

 sterna and femora are alike in the two species, so that the only ab- 

 solutely certain method of distinguishing them is in the number of 

 joints of the antennae. The two species are, however, readily sepa- 

 rated by direct comparison, notwithstanding their structural resem- 

 blance. In a species so small as this in which the antenme have a 

 persistent tendency to fold beneath the head, the counting of the 

 joints of the antennte is extremely troublesome. 



Occurs in Massachusetts, Pennsylvania, Michigan and Illinois. 



C. siibcupreus Say. — Elliptical, convex, piceons, surface very distinctly 

 feneous. Antennse 8 jointed (PI. iv. fig. 18), testaceous, club piceous. Front 

 moderately punctate, clypeus more closely and finely. Thorax equally, not 

 closely punctate, intervals smooth, no ba.sal marginal line. Elytra punctured 

 similarly to the thorax, a little less closely and more coarsely towaid the apex, 

 without any tendency to a linear arrangement of the punctures. Body beneath 

 piceous, opaque. Legs piceous or brown, the tarsi paler. Posterior femora 

 smooth, with a few scattered punctures, middle and anterior femora punctulate 

 and opaque, except at apical third. Length .06 — .08 inch. ; 1.5 — 2 mm. 



Prosternum very distinctly carinate, mesosternum with a small, 

 but acutely pyramidal protuberance. Maxillary palpi stout, formed 

 as in montlcola. 



Specimens are of quite common occurrence in which the sides are 

 paler, more distinctly so at the apex. The more northern forms of 

 this" insect are far more distinctly punctate than those from the south, 

 and some recently collected by Dr. Hamilton on the sea-coast at 

 Brigantine are, 'as a series, of smaller size than those found inland. 



The antennse are really 8-jointed, as observed by Dr. LeConte 

 (Proc. Acad. 1855, p. 373), although he afterwards doubted his ac- 

 curacy, but the character has been verified on a number of specimens 

 by Mr. Blanchard as well as myself, 



A very widely distributed species, occurring in the northern por- 

 tion of the continent from the New England States through Canada 

 to Oregon, thence South through California to Arizona, Texas, New 

 Mexico and Nebraska. In the Atlantic region it is not known to 

 me south of Virginia. 



C. dogener n. sp.— Elliptical, convex, piceous, faintly bronzed, sides of 

 thorax and elytra rather broadly, but indefinitely paler. Autenute 7-joiuted, 

 rufo-testaceous (PL ix, fig. 28j. Head piceous black, vertex distinctly punctate, 

 clypeus more finely and sparsely. Thorax shining, very distinctly and moder- 

 ately closely punctate. Elytra not punctate, the surface finely alutaceous and 

 subopaque, the sutural stria distinct from apex two-thirds toward base. Body 



TRANS. AM. ENT. SOC. XVII. (35) AUGUST, 1890. 



