140 MEMOIRS ON THE COLEOPTERA 



impressed inwardly as usual, the scutellar long. Length (cf 9 ) 

 1 1. o-i 1.7 mm.; width 4.3-4.6 mm. Lake Superior, [orinomus Kirby 

 nee Steph.] oblongonotatus Say 



Prothorax relatively smaller and shorter, the oblique sides posteriorly 

 straight or nearly so 5 



5 Body larger and much stouter, nearly as in the preceding. Color 

 black throughout, the antennae and palpi rufo-piceous; surface 

 shining, the elytra (9) very strongly sericeous; head moderate, 

 the impressions feeble but evident, nearly straight; labrum black; 

 mandibles feebly rufescent basally; prothorax nearly two-fifths 

 wider than long, the sides rounded; base feebly arcuate, equal in 

 width to the apex, the angles very obtuse, the subprominent dentic- 

 ulation extremely feeble; surface and the rather broad margins 

 nearly as in the preceding; elytra relatively much larger, one-half 

 longer than wide, almost one-half wider than the prothorax and three 

 times as long, oblong, the striae very fine and unimpressed throughout 

 the width, very feebly and minutely irregular, the scutellar rather 

 long, the first evenly bifurcating basally. Length (9) n.8 mm.; 

 width 4.65 mm. Oregon (Clackamas Co.) sericeus n. sp. 



Body smaller, rather less broad in form, the elytra of the female only 

 feebly sericeous 6 



6 Upper surface very moderately convex, shining; color deep black, the 

 legs black, the palpi piceous with the tip pale; head moderate, the 

 eyes rather large and prominent, the impressions distinct, arcuate 

 and diverging; labrum black; mandibles still shorter than in the 

 preceding, often rufescent; prothorax fully a third wider than long, 

 the sides rounded; angles obtuse but sharply defined, sometimes very 

 minutely subprominent; base transverse, barely as wide as the apex; 

 surface with a moderate patch of close punctures latero-basally and 

 with the linear impression rather short but deep, the side margins 

 unusually deeply and strongly channeled and reflexed; elytra three- 

 fifths longer than wide, polished, a little shorter and evidently, 

 though not very strongly, sericeous in the female, about a fourth 

 wider than the prothorax, the striae fine, gradually moderately im- 

 pressed suturally (d 71 ) or very fine and unimpressed throughout (9 ). 

 Length (cf 9 ) 9.2-10.7 mm.; width 3.2-3.9 mm. Alaska (Fort 

 Wrangel), Wickham; British Columbia (Metlakatla), Keen and 

 California (Siskiyou Co.), Koebele. [vitreus Dej., seriepunctatiis 

 Mann, and oblongiusculus Mots.]. Abundant. .. .adstrictus Esch. 



Upper surface more convex, black, shining, the legs slightly picescent, 

 the palpi pale piceo-testaceous; antennae brown, blackish at base; 

 labrum black; head moderate, with prominent convex eyes, the 

 impressions somewhat broad and ill-defined though rather deep; 

 mandibles small; prothorax less transverse than in adstrictus, nearly 

 a third wider than long, the sides almost evenly rounded from apex 

 to base, the angles obtuse but minutely and acutely subprominent, 

 the base transverse, barely as wide as the apex; side margins much 

 less widely reflexed or deeply channeled than in adstrictus, the punc- 

 tures and impressions nearly similar; elytra nearly similar but a 

 little more elongate, a fourth to nearly a third wider than the pro- 



