114 GEORGE II. HORN, M. D. 



scribed b}' Leconte as 07niss'iis. The interstrial spaces of the elytra are 

 usually entirely without punctures, in some however the punctures 

 are more or less distinct, and the separation of the latter species on 

 this character above appears not to be warranted. 



Specimens occur from Lake Superior to Oregon. Those from the 

 latter region and Dacota are those in which the interspaces are punc- 

 tulate. 



A. torpidus, n. sp. — Elongate oval, black, shining. Head finely and sparsely 

 punctured, front broadly rounded, broadly emarginate at middle, and slightly 

 but very distinctly sinuate near the gense. Thorax broader than long, convex, 

 with coarse punctures at the sides and base, very distantly placed, and with 

 very few finer punctures near the sides; sides moderately rounded, gradually 

 narrower from base to apex (when viewed from above), distinctly margined, 

 base margined at the sides. Elytra as in pinguis with the strise rather broad, 

 moderately deeply impressed; are coarsely but distantly punctured, inter- 

 spaces flat, scarcely punctulate. Beneath black, coarsely not densely punc- 

 tured, legs, brownish, antennre pale, club darker. Anterior tibice distinctly 

 serrate above the upper tooth. Sexual characters as in pinguis. Length .36 — 

 .40 inch; 9—10 mm. 



This species may be readily distinguished by the very distinct sinu- 

 ation of the sides of the front near the gente, and by the very distinct 

 marginal line at the sides of the base of the thorax. The elytra are 

 not uniformily colored, but have the entire second interspace, the base 

 of the third and the entire apex of the elytra, pale yellowish-testaceous, 

 the entii-e sutural or first interspace black. The specimens are all 

 colored alike, that I have seen. 



Occurs at Salt Lake, Fort Simpson and Oregon. 



A. occidentalis, n. sp. — Oblong, black, shining. Head smooth, with very 

 few and fine punctures anteriorly; gense very obtuse, not prominent. Thorax 

 broader than long, sides moderately rounded and distinctly margined, base 

 feebly bisinuate and margined on each side of the middle; disc convex, smooth 

 and with few coarse punctures toward the side and base, and no fine punctures 

 Elytra robust, sub-truncate at apex, one-fourth longer than the thorax ; uni- 

 formly fuscous, but more commonly yellowish-testaceous, with the middle por- 

 tion of each fuscous ; surface distinctly striate, strise distantly punctured, be- 

 coming obsolete toward apex, interstices flat, almost entirely impunctured. 

 Beneath black, coarsely not densely punctured, and sparsely pubescent. Legs 

 ferruginous-brown. Antennje rufous, club dark. Pygidium exposed, moder- 

 ately convex, coarsely and rather densely punctured. Anterior tibise with 

 outer edge above upper tooth usually simple, rather sub-crenulate. Sexual 

 characters as in hyperboreas. Length .32 inch ; 8 mm. 



Easily distinguished from all our species by the sub-truncate elytra 

 the exposed pygidium, the almost entirely impuuctured head, with the 

 sides of the gense very slightly prominent. The color of the elytra 

 varies from a uuiform brownish to those in which the sutural, apical 



