COLEOPTERA. 189 



33. A. piliictatus (Er.) — Form moderately robust. Pubescence very- 

 sparse, fine, short, evenly distributed, dark cinereous, scarcely visible; entire- 

 surface shining. Head somewhat small, nearly twice as wide as long ; inter- 

 ocular surface flat, nearly three-fourths wider than the eye ; sulcations almost 

 entirely obsolete ; intermediate elevation very feebly convex ; punctures rather 

 coarse, smaller and much closer in the depressed portions, a very narrow ir- 

 regular median line is almost impunctate ; ocular lines meeting at one length 

 in advance ; antennae distinctly longer than the width of head, rather slen- 

 der, pale testaceous, darker at tip; basal joints twice as long as wide, club 

 prominent ; third joint two-fifths longer than the fourth, eighth shorter and 

 much more robust than the seventh, joints of club much elongated, increas- 

 ing rapidly in length, eleventh as long as the eighth and ninth together; 

 maxillary palpi long, first and second joints slender, translucent, pale rlavo- 

 testaceous, the latter slightly darker toward tip, third nearly as long as the 

 first two together, becoming gradually robust toward tip, slightly darker, 

 very slender at base. Prothorax arcuately and very gradually increasing in 

 width to the middle, where it is just perceptibly narrower than long ; sides 

 thence slightly convergent posteriorly and distinctly sinuate ; anterior and 

 posterior margins equal in length and curvature, feebly arcuate ; surface 

 evenly and strongly convex, rather finely, closely, deeply, and evenly punc- 

 tate; interspaces convex, nearly equal in width to the punctures. Elytra at 

 base about equal in width to the head ; sides very feebly divergent posteriorly, 

 very slightly longer than the width at base, rather strongly arcuate, especi- 

 ally toward the apices ; together broadly, roundly, and moderately emargi- 

 nate behind ; suture nearly one-third longer than the pronotum ; surface 

 very convex, very feebly impressed on the suture at the base, evenly, deeply, 

 and moderately coarsely punctate ; punctures deeply impressed, distant by 

 less than their own widths ; interspaces very strongly convex. Abdominal 

 segments decreasing uniformly and very gradually in width, cylindrical, 

 first much narrower than the contiguous elytra ; border obsolete, very narrow 

 on the first ; surface very deeply, coarsely, closely, and evenly punctate ; 

 interspaces scarcely one-half as wide as the punctures ; transverse carinae 

 not cusped, strongly and finely undulated. Legs slender, rather pale 

 brownish-testaceous, femora very slightly darker toward tips, tarsi rather 

 robust; first joint of the posterior as long as the next two together; fourth 

 joints narrowly and not very conspicuously bilobed. 



Male. — Sixth .ventral segment narrowly and deeply incised at the apex, 

 incisure about twice as deep as wide, sides nearly straight, exterior angles 

 feebly rounded ; seventh segment broadly and evenly emarginate behind, 

 lateral teeth distinct. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 3.0-3.3 mm. 



Michigan and Lake Superior (various localities), 81 ; Pennsyl- 

 vania, 5 ; Willets Point, Long Island, 2 ; New Jersey, 1 ; Cam- 

 bridge, Massachusetts, 4; District of Columbia, 1. 



Appears to be a very widely distributed species, especially in the 

 interior of the continent. The forms in this portion of the genus are 

 so extremely closely allied, that it is a matter of great difficulty to 



