June i 9 oo.] Casey: On North American Coleoptera. 123 



Oval, rather more convex, shining, black, the antennae and legs dark testaceous ; 

 antennae slender, less than half as long as the body in the female ; prothorax 

 more than three-fourths wider than long, somewhat obtusely angulate and inflated 

 at the middle, the sides thence straight and moderately convergent to the base 

 and strongly so and straight to the apex ; punctures fine and somewhat sparse, 

 the impression deep ; elytra nearly as in the preceding but more than a fourth 

 wider than the prothorax, the punctures very fine and quite sparse — though but 

 slightly sparser than those of the pronotum. Length 1.5 mm.; width 0.7 mm. 

 ( 9). Colorado incerta, sp. nov. 



15 — Body oblong, parallel, only moderately convex, polished, piceous, the entire ely- 

 tra and legs pale flavo-testaceous , antennae pale with the club infuscate, some- 

 what slender and slightly less than half as long as the body ; prothorax small, 

 much narrower at any part than the base of the elytra, angularly inflated slightly 

 before the middle, the sides nearly straight and converging to base and apex, the 

 latter quite distinctly narrower than the base ; disk convex, two-thirds wider than 

 long, finely, rather sparsely punctate, the basal impression strong, extending evan- 

 escently to the very obtuse basal angles ; elytra oblong, parallel and almost 

 straight at the sides, broadly rounded at apex, more than three times as long as 

 the prothorax and about a third wider, the humeri widely exposed at base, rather 

 coarsely but not densely impresso-punctate and somewhat rugose by oblique il- 

 lumination. Length 1.55 mm.; width 0.72mm. Colorado. 



brevicoIlis,sp. nov. 



Body oblong, the elytra feebly inflated, polished, black or blackish, the elytra very 

 dark piceo-testaceous throughout ; antennae and legs dark testaceous, the former 

 slender and nearly half as long as the body ; prothorax large, three-fifths wider 

 than long, fully as wide at base as the closely fitting base of the elytra and nearly 

 as wide as at the very feeble subangular dilatation slightly behind apical third, 

 the apex slightly narrower than the base ; disk convex, finely and quite sparsely 

 punctate, the basal impression moderate ; elytra parallel and broadly arcuate at 

 the sides, widest and distinctly wider than the prothorax at the middle, not more 

 than two and one-half times as long as the latter, rapidly narrowed behind the 

 middle and acutely rounded at tip, the punctures rather coarsely impressed, 

 moderately close-set, not materially sparser than those of the pronotum. Length 

 1.4mm. ; width 0.65 mm. Alaska aleutica, sp. nov. 



16 — Prothorax subangularly dilated at, or a little before, the middle, narrowed to- 

 ward base and still more strongly toward apex, the elytral humeri exposed at 

 base 17 



Prothorax, viewed vertically, rounded at the sides from the base, more strongly nar- 

 rowed toward apex and widest perceptibly behind the middle 18 



Prothorax, viewed vertically, parallel at the sides from the base to or beyond the 

 middle, then strongly narrowed to the apex 19 



17 — Body, legs and antennae uniform pale ochreo-testaceous throughout, the latter 

 rather short and stout, but little longer than the head and prothorax, the eyes 

 moderate ; surface shining, the pubescence short, fine, ashy and rather abun- 

 dant ; prothorax four-fifths wider than long, not quite as wide as the base of the 

 elytra, the sides broadly angulate at apical two-fifths, the apex distinctly nar- 

 rower than the base, the basal impression rather feeble ; punctures very fine and 



