72 CASEY 



• than wide, tlie punctures smaller and very feeble, the inflexed 

 sides, prosternum, tihiie and epipleurae similar. Length 9.5 mm. ; 

 width 6.3 mm. Colorado acutangulus n. sp. 



17 — Body oblong, small and alutaceous (d) or ventricose and with 

 the elytra rather shining ($ ), glabrous, deep black; head alu- 

 taceous, finely and rather sparsely but distinctly punctate, the 

 clypeus broadly sinuate medially, very obsoletely so laterally, not 

 reflexed at apex but broadly and very obsoletely impressed behind 

 the rounded lobes ; prothorax short and transverse, very strongly 

 narrowed from base to apex, the latter circularly sinuate, with blunt 

 angles as usual, the hind angles moderately produced, acute and 

 sharp, the sides explanate and nearly flat, rather widely behind, 

 very narrowly at apex, the bead fine but distinctly elevated, the 

 punctures sparse and very minute throughout, sometimes more 

 evident in slight impressions laterally; elytra scarcely longer than 

 wide, with rounded sides, and, at the middle, evidently wider 

 than the prothorax (?) or parallel and not wider (c^), the punc- 

 tures coarse and irregular (?) or smaller and feebler (d^), the 

 flanks, epipleurae and prosternum as in the two preceding species, 

 the anterior tibiae with a much smaller and less everted though 

 very acute external angle at apex. Length 8.5-10.0 mm. ; width 

 5.5-6.7 mm. New Mexico (Las Vegas). [Colorado, near 

 Long's Peak, — LeConte] convexus Lee. 



Body evenly and broadly elliptical, convex, rather shining though 

 alutaceous, deep black, ghibrous; head nearly as in convexus 

 though smaller, with the apical sinus rather narrower and deeper ; 

 prothorax similar throughout but more evidently and rather less 

 sparsely punctate laterally; elytra about as long as wide, rounded 

 at the sides, the width at the reflexed humeri evidently greater 

 than that of the prothorax, the surface strongly convex and dif- 

 fering from any of the three preceding species in having no ele- 

 vated lines, the latter being traceable only by absence of punc- 

 tures, the latter small, feeble, rather sparse and very unevenly 

 distributed throughout, the flanks not very abruptly inflexed and 

 almost smooth ; epipleurte impunctate, more distinctly though 

 gradually wider from apex to base than in the three preceding 

 and similarly concave basally; prosternum finely, sparsely punc- 

 tate; anterior tibias as in convexus. Length 9.4 mm. ; width 6.0 

 mm. Colorado (north of Fort Collins), — Warren Knaus. 



rotundus n. sp. 



18 — Integuments rather shining to alutaceous in lustre 19 



Integuments densely opaque throughout above 20 



19 — Form elliptical, moderately elongate, convex, glabrous, deep 

 black, rather shining throughout; head minutely, not conspicu- 

 ously punctate, the clypeus broadly sinuate medially, obsoletely 

 at the sides, not reflexed but with the margin somewhat thickened ; 

 prothorax two and a fourth to iialf times as wide as its median 



