NORTH AMERICAN (( )l,i:( H'l'KRA. 5 



The characters on which tlie otlier s|)ccics were separated were the 

 apparently more truncate elytra, the hasal ii:ari>hial line of the tho- 

 rax, and the deeper or fainter stria?. 1 am now convinced that these 

 must be entirely disregarded, as there is not that constancy making 

 them worthy of consideration. It is also possible that the characters 

 used for the separation of validus may fail. 



A. validus Horn. — Form robust, convex, piceoiis or black, shining. Head 

 very sparsely finely punctate. Clypeus almost semicircular, feebly truncate at 

 middle, the gense moderately i)roniinent, but obtuse. Anteniia> ferrujiinous. 

 Thorax very convex, broader than the elytra, widest near the middle, sides ar- 

 cuate, narrowed at base, basal marginal line distinct, disc smooth, very sparsely, 

 minutely puuctate with coarser punctures toward the sides and at the hind an- 

 gles, the latter distinct, but obtuse. Elytra narrower than the thorax, very little 

 longer than wide conjointly, striate, the strife not closely punctured, intervals 

 flat or slightly convex, with extremely minute punctures .sparsely placed. Me- 

 sosternum not carinate. Metasteruura coarsely punctured at the sides. Abdo- 

 men sparsely punctate. Posterior femora coarsely and irregularly punctate. 

 Length .32 inch ; 8 mm. 



Male. — Anterior tibial spur spatulate, broader toward the tip and curved in- 

 wardly. Upper spur of middle tibia less than half the length of the lower. 

 Po.sterior tarsi with the first joint a little longer than the next three together 

 and with an acute recurrent process, forming with the joint the letter V. 



Female. — Unknown. 



The facies of this species is more robust, the elytra shorter and 

 more arcuate on the sides, the legs are also shorter, and the hind 

 tibiae, especially, thicker than in the following species. 



Three specimens collected at Abittibi House in the Hudson's Bay 

 Territory. 



A. haniatus Say.— Form oblong-oval, moderately robust, piceous or black, 

 the elytra varying to brown, and often with a paler suture and margin. An- 

 tennae ferruginous, club darker. Clypeus with oblique sides, in front truncate 

 and vaguely emarginate. Head almost entirely smooth or with extremely few 

 very fine punctures. Gente moderately prominent, but obtuse. Thorax convex, 

 not wider than the elytra, surfiice with a few fine punctures sparsely placed, often 

 entirely obsolete, toward the sides a few very coarse punctures; sides arcuate, 

 when viewed from above they are parallel at basal half, basal marginal line va- 

 riable, rarely entire, usually more or less interrupted, and very rarely entirely 

 absent. Elytra longer than wide conjointly, sides usually parallel at middle, 

 striate, the .strine not closely punctured, intervals fiat or slightly convex, and 

 usually with a few extremely fine putictures. Mesosteruum not carinate. Meta- 

 sternum coarsely obsoletely punctured at the sides. Abdomen sparsely jjunctate. 

 Posterior femora sparsely, irregularly puuctate. Length .'24-.40 inch ; 6-10 mm. 



Male. — Anterior and middle tibial spurs as in ralidu.'^. Fii-st joint of hind tar- 

 sus shorter than the next three, the recurrent process slender, very acute and 

 forming a wider angle. 



