50 AMERICAN COLEOPTERA. 



Very closely related to the preceding. It differs in having the 

 thorax longer as compared with its width, with the sides slightly 

 sinuate behind, the hind angles subacute and the surface alutaceous. 

 The elytra are wider as compared with the thorax, somewhat more 

 deeply striate with the intervals slightly more convex. The surface 

 is less shining, and the form more elongate and more convex than 

 in carinatum. From robusticolle it differs by its proportionally lon- 

 ger thorax, more elongate form and narrower elytra as compared 

 with the thorax, with the strise deeper and much more strongly* 

 punctured. 



It was described by Motschulsky from Alaska, and occurs also in 

 California and Arizona. 



11. B. robusticolle n. sp. — Form robust, convex; color dark bronze, shin- 

 ing. Head as wide as the thorax at apex, very tinely alutaceous ; palpi rufo- 

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

 rufous, as are the second and third beneath. Prothorax nearly twice as wide as 

 long, wider at base than apex, rugose at base and slightly so at apex, transversely 

 wrinkled along the median line ; apex slightly emarginate ; median line distinct, 

 abbreviated in front; transverse impressions distinct; basal impressions broad, 

 deep, very distinctly bistriate; sides with the margin very narrowly reflexed, 

 moderately arcuate, distinctly sinuate in front of the hind angles, which are 

 prominent, acute and carinate. Elytra about one-half wider than the thorax, 

 oblong-ovate, moderately deeply striate ; strise finely punctate, the punctures 

 becoming obsolete towards the tip; intervals slightly convex, the third with the 

 first dorsal puncture about the middle, the second about one-fifth from apex. 

 Beneath dark seneous, shining, the abdomen nearly black. Legs dark rufo- 

 piceous, slightly seneous, the femora rufous at base. Length .23-. 25 inch ; 5.75- 

 6.25 mm. 



This species is quite closely allied to the two preceding. It is, 

 however, more convex. The thorax is wider in proportion to its 

 length, with the sides more deeply sinuate behind, the basal impres- 

 sions more strongly bistriate and the hind angles more prominent 

 and acute. The elytra are wider as compared with the thorax, with 

 the strise less deep and much more finely punctured. It has quite a 

 different facies from either. 



Described from one male in my cabinet from Iowa. Specimens 

 have also been seen from Michigan and Kansas. 



12. B. bowdUclii Lee. — Form moderately broad, slightly depressed ; color 

 dull black, sometimes slightly bronzed, not shining, the surface alutaceous or 

 alutaceo-granulate. Head as wide as the thorax at apex; palpi black; antennae 

 about one-half the length of the body, black. Prothorax scarcely one-half wider 

 than long, wider at base than apex; apex slightly emarginate: median line dis- 

 tinct, entire ; anterior transverse impression obsolete or nearly so, the posterior 



