Juneigoo] CASLY: On NORTH AMERICAN CoLEOPTERA. 121 



wider than long, widest and broadly angulate at the sides at the middle, the 

 apex much narrower than the base ; punctures fine but deep and perforate, 

 separated by two or three times their diameters, with a narrow impunctate median 

 line not attaining the base, the basal impression well developed, the basal bead 

 very feeble and flat ; elytra subinflated and widest at two-fifths, where they are a 

 fourth wider than the prothorax, about three times as long as the latter, the 

 humeri narrowly exposed at base, the ape* narrowly roun led ; punctures very 

 small but perforate and moderately close-set. Length 1. 45 mm.; width 0.75 



mm. Canada (Ottawa) saginata, sp. nov. 



Juxtahumeral impressions very small and feeble 11 



II — Prothorax rather rounded than angulate at the sides at or before the middle 12 



Prothorax conspicuously, though broadly, angulate at the sides at or slightly before 

 the middle, where it is much wider than at base, the sides rapidly convergent 

 from the angle to the apex and straight or broadly sinuate ; elytral humeri dis- 

 tinctly exposed at base 13 



12 — Prothorax relatively long and narrow, scarcely three-fourths as wide as the elytra 

 and but little wider at the submedian dilatation than at base, very strongly nar- 

 rowed at apex, the latter much narrower than the base ; body elongate-oval, 

 shining, testaceous throughout, the antennae distinctly less than half as long as 

 the body in the female ; prothorax strongly convex, finely but deeply and closely 

 perforato-punctate, the basal impression deep and narrowly impressed ; elytra dis- 

 tinctly wider at two-fifths than at base, where they are scarcely wider than the base 

 of the prothorax, two and two-thirds times as long as the latter, acutely rounded 

 at tip, the punctures fine but distinct, rather impressed and moderately close-set, 

 at least three times as sparse as those of the prothorax. Length 1.6 mm.; width 



0.78 mm. District of Columbia ochracea Zimm. 



Yar. A— Similar in color but with the head and prothorax slightly piceous, the 

 latter equally distinctly and very closely punctate, the punctures separated by 

 only their own diameters, and, as usual, coarser toward the sides and basal 

 angles ; basal impression much feebler and less acutely impressed ; elytra 

 strongly and rather sparsely impresso-punctate ; body more narrowly oval. 



Length 1. 65 mm.; width 0.75 mm. Lake Superior lacustris, v. nov. 



Yar. B — Body nearly similar in form but slightly smaller and more rapidly at- 

 tenuate at the extremities, blackish-piceous to dark testaceous in color, pol- 

 ished, the pronotum finely and rather sparsely punctate, the basal impression 

 much feebler and more broadly impressed than in ochracea ; elytra minutely 

 and rather feebly, moderately sparsely punctate, the punctures but little more 

 widely separated than those of the pronotum. Length 1.2-I.5 mm.; width 

 O.58-0.75 mm. Mountains of Pennsylvania (Westmoreland Co. ). 



pennsylvanica, v. nov. 

 Prothorax shorter and decidedly more transverse, two-thirds to three-fourths wider 

 than long, much narrower at base than at the med an inflation, at least four-fifths 

 as wide as the elytra, distinctly, though less markedly, narrower at apex than at 

 base, strongly convex, finely and rather sparsely punctate, the basal impression 

 rather deep and acutely impressed ; elytra shorter and less obviously narrower at 

 base than at the feeble inflation two-fifths from the base, the humeri more widely 

 exposed at base, less than three times as long as the prothorax and narrowly 



