98 AMERICAN COLEOPTERA. 



form is less slender, and the elytra are somewhat wider as compared 

 with the thorax. The coloration is nearly the same, except that the 

 elytral markings are, as a rule, better defined in the present species 

 and the legs darker. The surface is rather less shining. It is also 

 closely allied to approximatum, but may be separated by the charac- 

 ters given in the table. It has been known in our lists as undulatum 

 Sturm. 



With clenfellum I have united incrematum Lee, which occurs on 

 the Pacific coast, the study of a fairly large series having convinced 

 me that the two cannot be retained as distinct. B. arc^iatum Lee. 

 is also synonymous with this species. 



It occurs in the more northern parts of the continent from the 

 Atlantic to the Pacific, being known to me from Nova Scotia, Mar- 

 quette, Mich., Winnipeg, Man., Coeur d' Alene, Idaho (Wickham ), 

 Oregon, Washington, British Columbia, Vancouver Island and 

 Alaska. It also occurs in Europe. 



70. B. coloradeuse u. sp. — Form broad, feebly convex ; color dull black, 

 often with a bluish or more rarely slightly bronze tinge, elytra frequently with 

 a small submarginal pale spot about one-fourth from apex. Head iinely aluta- 

 ceous, as wide as the thorax at apex ; palpi black ; antennae about one-half as 

 long as the body, black. Prothorax subquadrate, nearly twice as wide as long, 

 as wide at base as apex, finely alutaceous; apex truncate; median line distinct, 

 usually entire, though more marked between the transverse impressions, which 

 are rather feeble ; basal impressions broad, moderately deep, bistriate ; sides with 

 the margin narrowly reflexed. arcuate nearly to base, feebly sinuate in front of 

 the hind angles, which are rectangular and distinctly carinate. Elytra slightly 

 wider than the thorax, oblong-uvate, moderately finely striate, the surface usually 

 very finely alutaceous ; strife entire, more finely impressed towards the tip, finely 

 but distinctly punctate to behind the middle, the seventh slightly grooved at tip ; 

 intervals flat, the third with the first dorsal puncture about one-third from base, 

 the second about one-third from apex. Beneath black, shining. Legs black. 

 Length .16-22 inch ; 4-5.5 mm. 



This species seems most closely allied to approximahmi, from which 

 it differs by its more convex form, with the thorax wider in propor- 

 tion to its length and the sides arcuate nearly to base, being slightly 

 sinuate for only a short distance in front of the hind angles. The 

 surface is also less shining than in the latter species, the thorax and 

 elytra being very finely and the head more distinctly alutaceous. It 

 seems subject to but slight variation, the submarginal spot being 

 sometimes absent. In one specimen that I have seen there is, in 

 addition, a feebly indicated submarginal spot about one-third from 

 base. 



