336 Coleopterological Notices, VII. 



moderately strong. Elytra narrowly elliptical, about f longer tha» 

 wide, 3 times as long as the prothorax and 2|- times as wide, not 

 fall but obliqueh^ and broadl}^ rounded at the humeri, the reflexed 

 margins distinct and coarsely, distantly punctate; disk evenl}' 

 and moderately convex, deeply and coarsely striate, the striae 

 coarsely and unevenly punctate ; intervals convex, distinct to 

 the sides but frequently interrupted, more tuberculosely so toward 

 tip. Length 12.0-14.0 mm.; width 4.5-5.5 mm. 



Alaska to Oregon. The female type described above is from 

 Fort Wrangel, Alaska, and presumably represents the true mar- 

 ginatus. Other representatives differ slightly ; for example, a 

 male from Oregon has the oblique sides of the prothorax almost 

 straight behind, the sublateral impressions feebler and the surface 

 alutaceous with violaceous reflection toward the sides. Another 

 female, without locality label, has a smaller and shorter prothorax, 

 which is duller black and without distinct indication of metallic- 

 lustre ; finally a number of specimens from Washington State are 

 very small, perhaps representing a geographical subspecies. The 

 assumed typical form has the sides of the prothorax distinctly 

 sinuate toward base, and the sublateral impressions A'ery long 

 and strong ; as is frequently the case, the prothorax of the female 

 is smaller than, in the male. 



36. B. confusus n. sp. — Elongate, feebly ventricose, shining throughout, 

 the pronotum not distinctly alutaceous, piceous-hlack, piceous beneath, the 

 elytra metallic seneo-cupreous in lustre, the reflexed margins brighter viridi- 

 seneous. Head moderately stout and elongate, the median parts of the vertex 

 very slightly wrinkled transversely ; supra-orbital ridges fine posteriorly ; 

 gense scarcely at all developed, with a very minute angulate notch ; antennae 

 slender, scarcely % as long as the body, the base joint moderately stout, about 

 as long as the next two, the seta at apical sixth. Prothorax relatively mod- 

 erate in size, scarcely as long as wide, moderately dilated and rounded an- 

 teriorly, broadly subangulate at apical %, the sides thence oblique and al- 

 most perfectly straight to the base ; angles much more than right, bluntly 

 rounded ; base rather wide, somewhat more than % the maximum width and- 

 fully as wide as the head ; disk feebly convex, the median line and sublateral 

 impressions deep, the latter sigmoid, extending to apical fourth. Elytra 

 elongate-elliptical, not at all full but broadly and obliquely rounded at the 

 humeri, nearly 3^ longer than wide, not quite 3 times as long as the prothorax 

 and not more than twice as wide, the reflexed margins moderate in width and 

 coarsely, unevenly punctate ; disk evenly and moderately convex, coarsely 

 and irregularly punctate, the punctures arranged in vaguely defined, feeblyr 

 impressed striseform series, the intervals convex and much disintegrated.. 

 Length 11.7-13.7 mm, ; width 4.8-5.6 mm. 



