188 NORTH AMERICAN 



Detroit, Michigan, 1. 



This fine species is distinguished with ease from callosus (Er.) by 

 the palpi, the last joint of which is shorter, darker in color, and much 

 more strongly and abruptly clavate in varipes. The coloration of the 

 legs is also different. 



32. A.axculus (Kr.) — Form rather slender, sub-cylindrical. Pubescence 

 sparse, inconspicuous, rather long and coarse on the abdomen, cinereous. 

 Body highly polished. Head small, robust, not twice as wide as long: 

 interocular surface twice as wide as the eye, very feebly convex, rather 

 acutely so in the middle ; sulcations almost obsolete ; supra-antennal tuber- 

 culations much elongated, impunctate ; punctures coarse, deeply impressed, 

 nearly evenly distributed, close; ocular lines meeting at one and one-half 

 lengths in advance ; antennae rather short, scarcely longer than the width 

 of head, stout, pale piceo-testaceous throughout, club moderate, joints beyond 

 the first slightly darker at their distal extremities ; third joint one-half 

 longer than the fourth ; maxillary palpi very long, first two joints very 

 slender, flavate, third infuscate, toward tip. Prothorax arcuately, evenly, 

 and gradually increasing in width for two-thirds the length posteriorly, 

 where it is narrower than long, sides thence moderately convergent and 

 very strongly sinuate ; anterior margin slightly shorter and more arcuate 

 than the posterior ; surface rather coarsely, very closely, deeply, and some- 

 what evenly punctate ; a median line is generally impunctate. Elytra at 

 base just perceptibly wider than the head ; sides very feebly divergent 

 posteriorly, as long as the width at base, very strongly ami nearly evenly 

 arcuate ; together broadly, somewhat angularly and very strongly emargi- 

 nate behind ; suture about one-eighth longer than the pronotum ; surface 

 very convex, very feebly and narrowly impressed on the suture toward the 

 base, coarsely and rather closely punctate ; punctures very deeply impressed, 

 round, rather irregularly distributed ; interspaces very convex. Abdominal 

 segments decreasing uniformly and very gradually in width, first much 

 narrower than the contiguous elytra, cylindrical, rather strongly constricted 

 at base ; border obsolete ; surface strongly, closely, and evenly punctate ; 

 punctures but slightly smaller than those of the pronotum ; transverse 

 carinae not cusped. Legs slender, piceous-hrown, bases of the tibiae paler ; 

 first three joints of the posterior tarsi much elongated, uniformly and gradu- 

 ally decreasing in length ; fourth joints moderately bilobed. 



Male. — Posterior edge of the fifth ventral segment narrowly, roundly, and 

 rather feebly emarginate in the middle ; sixth narrow, sinuate at apex, sinus 

 small, acutely rounded at the bottom, slightly more than twice as wide as 

 deep. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 2.8-3.4 mm. 



Michigan, 7 ; Nebraska, 1 ; Middle States, 7 ; District of Columbia, 

 5; Canada, 2 ; Cambridge, Massachusetts, 4; Texas, 2. 



The under surface of the abdomen is more densely pubescent than 

 the upper. The species resembles callosus (Er.), but is separated 

 easily by the male sexual characters and color of the legs. 



