io6 MEMOIRS ON THE COLEOPTERA 



soletely and partially crenulate within in the male. Length (cf 9 ) 

 15.0-16.5 mm.; width 5.25-5.8 mm. California (Humboldt Co.). 



suffusus n. sp. 



Form more slender, black, shining, the elytra in sculpture and lustre as 

 in crenicollis; head much less developed, the anterior impressions 

 separated by fully one-half more than either from the sides, the 

 epistoma and labrum nearly similar; prothorax of very different 

 form, fully as long as wide, the sides broadly and feebly crenulate 

 but almost straight from apex to base, being but just visibly arcuate, 

 becoming straight basally, the base feebly sinuate medially, arcuate 

 near the angles and five-sixths the maximum width, the angles 

 slightly obtuse and blunt; surface similarly impressed, the wavy 

 lines nearly obsolete; elytra nearly three-fourths longer than wide, 

 parallel, with feebly arcuate sides and rounded apex, nearly a third 

 wider than the prothorax, the striae rather fine but deeply impressed, 

 the intervals shining though micro-reticulate and also feebly, inde- 

 finitely sculptured or subpunctulate along their crests, strongly con- 

 vex, becoming much less so suturally; hind tibiae (cf ) with about 

 four very low long wave-like internal crenelures, the tarsi slender. 

 Length (cf) 15.0 mm.; width 5.3 mm. Oregon (Clackamas Co.). 



rectilatus n. sp. 



12 Elytra a little wider behind the middle than at base, notably so in 

 the female; hind tibiae more or less crenulate within in the male.. . 13 



Elytra evenly oval or oblong-oval 15 



13 Elytra shorter, not more than one-half longer than wide. Body 

 rather broadly suboblong, moderately convex, deep black, shining, 

 the elytra feebly alutaceous (cf), opaque (9); head rather large, 

 fully two-thirds as wide as the prothorax, the impressions deep, 

 feebly arcuate, separated by fully one-half more than either from 

 the side, the epistoma and labrum feebly sinuato-truncate; antennae 

 piceous, gradually testaceous apically; prothorax slightly transverse, 

 a fourth to fifth wider than long, the sides rounded, not distinctly 

 crenulate, slightly converging, becoming broadly, feebly sinuate, to 

 the feebly prominent but rather blunt angles, the base broad, feebly 

 sinuate medially, fully five-sixths the maximum width; surface with 

 feeble wavy lines, the inner lateral impression large, deep and a 

 third the total length, the surface thence to the sides sloping upward, 

 feebly convex and unmodified, except sometimes by a very fine and 

 feeble juxta-marginal ridge, bordered inwardly by a very feeble 

 impression; elytra (cf ) a third or ( 9 ) nearly two-fifths wider than 

 the prothorax, rounded behind, very broadly and obtusely in the 

 female, the striae deeply impressed, the intervals strongly convex, 

 more feebly in the female; hind tibiae (cf ) very feebly or scarcely 

 visibly crenulate within, or ( 9 ) simple, the tarsi lather long and 

 slender. Length (cf 9 ) 14.0-16.0 mm.; width 5.6-6.0 mm. Cali- 

 fornia (coast regions north of San Francisco) plutonicus n. sp. 



Elytra more elongate 14 



14 Form elongate, deep black, strongly shining, the elytra in the female 

 alutaceous; head nearly as in the preceding, except that the labrum 

 is transversely truncate; antennae more elongate, extending well 



