126 AMERICAN COLEOPTERA. 



-, 115. B. catitllin Lee. — Form moderately robust; color black, scarcely 

 seueous, shining, the elytra sometimes tinged with brownish, with a submarginal 

 spot about one-fourth from apex and the apex pale. Head as wide as the thorax 

 at apex ; palpi piceous ; antennse about one-half the length of the body, piceous, 

 slightly paler at base. Prothorax about one-half wider than long, narrower at 

 base than apex, sparsely punctate at base ; apex truncate ; median line fine, ab- 

 breviated in front; transverse impressions distinct ; basa) impressions broad, deep, 

 bistriate ; sides with the margin very narrowly reflexed, arcuate in front, sinuate 

 behind ; hind angles rectangular. Elytra about one-half wider than the thorax, 

 oblong-ovate, moderately deeply striate; striae distinctly punctate; intervals 

 slightly convex, the third with the first dorsal puncture about one-third from base- 

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

 from rufous to piceous. Length .12-. 15 inch ; 3-3.75 mm. 



Distinct from cmgidiferum by its somewhat broader, less elongate 

 form and rectangular hind angles of the thorax, the basal impres- 

 sions of which are bistriate. The elytra are more deeply striate than 

 in average specimens of the latter species, and the thorax is slightly 

 broader as compared with its length and somewhat less narrowed 

 behind. The pale markings of the elytra, especially the submarginal 

 spot, are usually moi-e clearly defined than in anguliferum, though 

 sometimes obscure, or even nearly etfaced, as in some examples of 

 co)i7iivens. 



It is rather feebly separable from the latter species by its more 

 convex form and by the bistriate basal impressions of the thorax. 



It occurs in the Rocky Mountain region, Utah, Washington, 

 Idaho, at Ft. Wrangel, Alaska (Wickham) and in the east in 

 Michigan (Hubbard and Schwarz) and at Brookline, Mass. ( Bow- 

 ditch). 



116. B. COiinivens Lee. — Form less convex than in cnutum, which it re- 

 sembles in color. Head as wide as the thorax at apex ; palpi piceous or rufo- 

 piceous ; antennae about one-half the length of the body, piceous. the first joint 

 often rufous. Prothorax about one-half wider than long, narrower at base than 

 apex; median line fine, abbreviated in front; transverse impressions moderately 

 distinct; basal impressions deep, unistriate; sides with the margin narrowly re- 

 flexed, arcuate in front, sinuate behind ; hind angles re(^taugular Elytra about 

 one-half wider than the thorax, oblong-ovate, moderately finely striate ; striae 

 distinctly puiictate; intervals nearly flat, the third with the first dorsal puncture 

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

 shining. Legs varying from rufous to piceous. Length .12-. 14 inch ; 3 3.5 mm. 



Very closely allied to the preceding, from which it is but feebly 

 dis inct by its more depressed form and by the unistriate basal im- 

 pressions of the thorax. The elytra are somewhat more finely 

 striate, and the pale markings near the apex are more frequently 

 obscure than is the case in B. cautam, and, in fact, in some examples 

 are entirely efiaced. 



