184 NORTH AMERICAN 



acters are almost exactly the same as those of the above-mentioned 

 species. 



28. A. dillltllS n. sp. — Form very slender. Pubescence very sparse, fine, 

 dark plumbeous, scarcely visible. Head robust, less than twice as wide as 

 long ; interocular surface flat, two-thirds wider than the eye ; sulcations very 

 narrow, feeble and obscure ; intermediate surface excessively feebly convex ; 

 punctures rather coarse and deep, nearly absent along the middle, more 

 crowded in the sulcations ; ocular lines meeting at one length in advance ; 

 antennae distinctly longer than the width of head, rather pale brownish- 

 testaceous; club distinctly darker, rather prominent; third joint one-third 

 longer than the fourth, eighth scarcely longer than wide, very robust, much 

 shorter and thicker than the seventh, joints of club increasing uniformly and 

 rather gradually in length ; maxillary palpi long and slender, flavate, third 

 joint slender, nearly as long as the first two together. Prothorax widest at 

 the middle, where it is much narrower than long ; sides thence equally and 

 extremely feebly convergent anteriorly and posteriorly, nearly straight in 

 both cases ; anterior and posterior margins equal in length, the former rather 

 strongly arcuate, the latter very slightly more feebly so ; surface evenly and 

 strongly convex, nearly cylindrical ; punctures deeply impressed, very close, 

 rather unevenly distributed, somewhat small; interspaces strongly convex, 

 highly polished. Elytra at base as wide as the head ; sides nearly parallel, 

 distinctly longer than the width at base, nearly straight toward the humeri, 

 very strongly arcuate toward the exterior apical angles ; together broadly, 

 somewhat angularly and strongly emarginate behind ; suture about one- 

 tenth longer than the pronotum ; surface strongly convex, narrowly and 

 feebly impressed along the suture, more strongly so toward the base, 

 coarsely, deeply, and closely punctate, piceous in color ; punctures some- 

 what irregular in outline, distant by less than their own widths ; inter- 

 spaces strongly convex, highly polished. Abdominal segments decreasing 

 nearly uniformly and just perceptibly in width, first much narrower than 

 the contiguous elytra, cylindrical, strongly constricted at base ; transverse 

 carinae broadly and strongly undulated ; surface strongly, closely, and 

 evenly punctate ; interspaces convex, polished, not as wide as the punc- 

 tures. Legs slender, pale brownish-testaceous throughout, tarsi short; first 

 joint of the posterior nearly twice as long as the second. 



Jtfale. — Fifth ventral segment scarcely perceptibly, roundly, and narrowly 

 emarginate in the middle at apex ; sixth narrowly and deeply incised at tip, 

 incisure more than twice as deep as wide, anterior angle very narrowly 

 rounded, exterior angles narrowly rounded, sides slightly arcuate; seventh 

 segment broadly and feebly emarginate at the vertex, emargination nearly 

 transverse at the bottom, lateral teeth short, stout, and straight. 



Female. — Sixth segment very broadly and evenly rounded behind. 



Length 3.0 mm. 



Louisiana, 2. 



The piceous color of the elytra and portions of the abdomen seen 

 in the above-described species, and also to a certain extent in the 



