60 . AMERICAN COLEOPTERA. 



than the thorax, oblong-ovate, striate as in longuhtm. Beneath black, shining. 

 Legs dark piceous or black. Length .16-. 19 inch ; 4-4.75 mm. 



This species resembles recticolle in having the thorax as wide at 

 base as apex, but is distinct by its broader form, proportionally wider 

 thorax and abbreviated outer elytral striae. The latter character 

 allies it to longulum. From coneolor it is distinct by its more de- 

 pressed form and by the striatiou of the elytra and form of the 

 thorax. The latter is more quadrate, with the sides more nearly 

 parallel, in this species and recticolle than in the others of the group. 



Its range of distribution is nearly the same as that of the last- 

 named species, but it is less abundant and apparently more local. It 

 occurs from the Rocky Mountain region westward to the Pacific 

 coast. 



25. B. coneolor Kirby. — Form moderately broad, feebly convex; color 

 black, more or less bronzed, the elytra often somewhat brownish or purplish with 

 geneous lustre. Head slightly narrower than the thorax at apex ; palpi piceous 

 or rnfo-piceous ; antennte about one-half the length of the body, piceous, the 

 tirst joint more or less tinged with rufous. Prothorax about one-half wider than 

 long, scarcely narrower at base than apex ; apex feebly emarginate ; median line 

 distinct, usually abbreviated before and behind ; anterior transverse impression 

 rather feeble, or sometimes nearly obsolete, the posterior distinct ; basal impres- 

 sions moderately deep, scarcely rugose, bistriate, the outer stria smaller ; sides 

 with the margin narrowly reflexed, arcuate in front, obsoletely sinuate behind ; 

 hind angles obtuse, but not rounded, with a short, fine carina. Elytra nearly 

 one-half wider than the thorax, oblong-oval, deeply striate; strise very distinctly 

 punctate, the punctures becoming obsolete towards the tip, the seventh slightly 

 grooved at apex ; third stria with the first dorsal puncture about one-third from 

 base, the second about one-third from apex; intervals slightly convex. Beneath 

 black, shining. Legs piceous, or rufo-piceous. Length .15-. 20 inch ; 3.75-5 mm. 



This species resembles most closely B. quadrulma, from which it 

 differs in having the thorax very slightly narrower at base than 

 apex and the elytral strise entire. With recticolle it agrees in having 

 the strife of the elytra not abbreviated behind. It is, however, more 

 robust, and differs in the form of the thorax. 



It is essentially a Northern species, occurring from Lake Superior 

 to the Pacific coast. I have never known of its occurrence further 

 South than Cheyenne, Wyo. I have seen one specimen from Sebago 

 Lake, Me. (Blanchard). 



26. B. recticolle Lee. — Form elongate, slightly depressed: color black, 

 shining, often with more or less seneous lustre. Head as wide as the thorax at 

 apex; palpi black; antennte about one-half as long as the body, black. Protho- 

 rax slightly wider than long, as wide at base as apex, scarcely rugose at base ; 

 apex feebly emarginate ; median line deep, abbreviated before and behind ; ante- 

 rior transverse impressioji rather feebly marked, the postej'ior distinct; basal 



