June 1900.] Casey : On North American Coleoptera. 95 



thirds longer than wide, broadly rounded behind, coarsely and unusually sparsely 

 punctate ( J). Length 2.45 mm.; width 1. 00. Pennsylvania (Westmoreland 

 Co.) infuscatus, sp. nov. 



Body nearly as in infitscatt's but smaller and rather less elongate, pale rufo- ferruginous 

 in color throughout, the elytra rather more strongly narrowed and less broadly 

 rounded behind, similarly sculptured but with the antennal club shorter and rela- 

 tively broader and more compact (9)- Length 2.25 mm.; width 0.9 mm. 

 District of Columbia plectrum, sp. nov. 



13 — Body parallel, rufo-ferruginous throughout, the prothorax large, three-fifths wider 

 than long, fully as wide as the elytra, strongly, moderately densely punctured, the 

 callous spots small but very conspicuous and distinctly elevated ; elytra three fifths 

 longer than wide, rather abruptly and very obtusely rounded behind, the punc- 

 tures coarse and rather sparse, but much closer and rather more perforate than in 

 the two preceding species {$)■ Length 2.4 mm.; width 0.95 mm. New 

 York — Mr. H. H. Smith cicatricosus, sp. nov. 



14 — Prothorax as wide at the apex as at the middle ; body pale flavo- testaceous in color 

 throughout, the pubescence long, erect and hispid, very conspicuous though unusu- 

 ally sparse ; prothorax small, transverse, strongly, but not very coarsely or closely, 

 punctured, the callous spots all very distinct; elytra oval, just before the middle 

 nearly two-fifths wider than the prothorax, the punctures very coarse, deep and 

 sparse, but, as usual, small or obsolete toward apex, each with an elongate cal- 

 lous median space near the tip ( J )• Length 1. 9 mm.; width 0.8 mm. North 

 Carolina pol itus , sp . nov. 



Prothorax much narrower at the apex than at the middle ; body broadly oval, strongly 

 convex, highly polished, dark piceo-rufous in color throughout, the pubescence 

 moderately long, sparse, coarse and ashy ; pronotum evenly convex, not very 

 densely punctate, the callous spots small and subobsolete ; elytra inflated, 

 scarcely one-half longer than wide, quite pointed at apex, the punctures very 

 coarse, sparse and conspicuous toward the base and sides ( 9 ) • Length 1 .85 mm. ; 

 width 0.8 mm. Lake Superior difficilis, sp. nov. [Lee. MS) 



I5^Truncature of the anterior thoracic angles forming a broadly oval, sharply defined, 

 flat or feebly concave disk, having a large subcentral foveifonn puncture, and 

 from a vertical viewpoint, oblique and perfectly rectilinear 16 



Truncature irregular, narrow, sometimes nearly flat but generally more or less con- 

 vex 25 



16 — Elytral pubescence semi-erect, the longer subserial hairs distinct and more or less 

 bristling 17 



Elytral pubescence short, decumbent and even, the longer subserial hairs almost or com- 

 pletely obsolete 22 



17 — Species of the Atlantic coast; eyes small and strongly convex 18 



Species of the Pacific coast, the eyes still smaller, extremely convex and subparabolic 

 in outline from above 21 



18 — Body very short and stout, not more than twice as long as wide, oblong, convex, 

 blackish-piceous in color, the head, pronotum, antennae and legs dark testaceous; 

 prothorax large, very nearly as wide as the elytra, three-fifths wider than long, 

 strongly and densely punctate, uneven, the callous elevations distinct ; angular 

 truncatures sensibly shorter than the distance thence to the spicules ; elytra very 



