196 NORTH AMERICAN 



punctures small, rounded, rather close, occasionally coalescent on the flanks ; 

 interspaces feebly convex, highly polished. Elytra at base more than one- 

 fourth wider than the head ; sides parallel, feebly arcuate, more strongly 

 so posteriorly, about equal in length to the width at base ; together broadly, 

 angularly and somewhat strongly emarginate behind ; outer apical angles 

 acute ; suture about two-fifths longer than the pronotum ; surface convex, 

 broadly and distinctly impressed on the suture at the base ; punctures 

 small, round, evenly distributed, deeply impressed, distant by about their 

 own widths ; interspaces highly polished and moderately convex. Abdo- 

 minal segments decreasing unifofmlv and rather rapidly in width, first 

 slightly narrower than the contiguous elytra, cylindrical, slightly constricted 

 at base ; surface coarsely, very closely, and evenly punctulate, appearing as 

 if perforated ; lateral border obsolete ; transverse carinae not cusped. Legs 

 short and slender, piceous-black above, slightly paler fuscous beneath ; first 

 joint of the posterior tarsi slightly longer than the next two together. Under 

 surface of the abdomen very closely, coarsely, and evenly punctate, appear- 

 ing as if perforated. 



Male. — Unknown. 



Female. — Sixth ventral segment very obtusely rounded behind. 



Length 3.2 mm. 



Wyoming Territory, 1. 



This species can be readily identified by its very peculiar robust 

 fusiform shape, small head, and deep close punctuation on the under 

 surface of the abdomen. 



41. A. lucidus n. sp. — Form robust, convex. Pubescence excessively 

 sparse, short, and inconspicuous ; entire surface very highly polished. Head 

 small, robust, scarcely twice as wide as long ; interocular surface twice as 

 wide as the eye, very feebly convex, equally divided by the sulcations, which 

 are nearly obsolete ; -intermediate surface evenly and distinctly convex ; 

 punctures small, distant, except in the sulcations, where they are closely 

 crowded ; ocular lines meeting at nearly two lengths in advance ; antennae 

 short, scarcely longer than the width of head, slender, dark piceo-testaceous 

 throughout, club small ; third joint one-fourth longer than the fourth, fourth 

 and fifth equal in length, joints of club slightly elongated, last two equal 

 in thickness and more robust than the ninth ; maxillary palpi long, dark 

 piceous-brown, basal joint very slightly paler. Prothorax arcuately, evenly, 

 and rather rapidly increasing in width to a point very slightly in advance of 

 the middle, where it is about as wide as long ; sides thence rather less rapidly 

 convergent posteriorly and very feebly sinuate ; anterior margin very slightly 

 shorter and more arcuate than the posterior ; surface feebly impressed just 

 behind the anterior margin, otherwise evenly convex, finely punctate ; punc- 

 tures round, deeply impressed, rather close, somewhat unevenly distributed ; 

 a narrow fusiform space in the middle is impunctate. Elytra at base dis- 

 tinctly wider than the head ; sides very feebly divergent posteriorly, strongly 

 arcuate, more especially near the apices, about equal in length to the width 

 at base; together broadly, roundly, and rather strongly emarginate behind ; 



