156 MEMOIRS ON THE COLEOPTERA 



the sulci very deep; eyes large, moderately prominent; antennae 

 slender, very nearly as long as the elytra, black, obscure rufous at 

 base, the medial joints between two and three times as long as wide; 

 prothorax fully two-fifths wider than long, the apex apparently 

 even somewhat arcuate, much wider than the base, which has fully 

 three-fourths the maximum width; sides arcuate, reflexed, rapidly 

 converging and arcuate behind about the middle to the long and 

 straight, parallel or even slightly diverging basal part, which is 

 fully a fifth the total length; at each side of the middle near the base 

 there is a transversely oval depression; foveae deep, linear, separated 

 from the carina, which is equally long and distinct; elytra barely 

 one-half longer than wide, two-thirds wider than the prothorax, 

 subparallel, with arcuate sides and rather gradually rounded humeri; 

 striae feebly impressed suturally, abbreviated at apex, much more 

 considerably toward the sides, the seventh series not extending to the 

 middle; punctures rather strong and widely spaced in the series, 

 gradually very fine and obsolete posteriorly; foveae at two and four 

 sevenths. Length (9) 3-7 mm.; width 1.5 mm. Michigan (Mar- 

 quette), Sherman concretum n. sp. 



Body much less stout, convex, very feebly alutaceous, black, the elytra 

 with posterior maculation as in the two preceding but more nubi- 

 lous; under surface black, the legs bright rufous; head as wide as 

 the prothorax, the sulci as in concretum, the eyes a little smaller but 

 more prominent; antennae slender, blackish, more gradually testa- 

 ceous basally, the medial joints more obconic, slightly more than 

 twice as long as wide; prothorax not so broad, barely a fourth wider 

 than long but otherwise as in concretum, the impression at each side 

 of the middle posteriorly not so marked, the deep elongate foveae 

 larger and a little longer than the distinct carina; anterior impression 

 similarly evident though broadly concave medially, the stria fine, 

 not entire; elytra similar in form, the arcuate sides rather more 

 rapidly rounding basally, one-half longer than wide, nearly three- 

 fourths wider than the prothorax; striae rather fine, feebly impressed, 

 the sutural strongly as usual, obsolete for a greater distance apically 

 than in concretum, and with the punctures finer and less remotely 

 separated; foveae similar. Length (9) 3.4-3.5 mm.; width 1.3- 

 1.35 mm. Rhode Island (Boston Neck) congruens n. sp. 



3 Species very small, much under 3 mm. in length; external frontal 

 groove longer 4 



Species larger, approximating 3 mm. or more in length 5 



4 Form ventricose, rather strongly convex, shining, black, the elytra 

 picescent, each with a relatively large and conspicuous subexternal 

 flavate spot near apical fourth and almost isolated from the poste- 

 rior and apical flavate margin; legs pale flavo-testaceous; head but 

 very little narrower than the prothorax, the eyes prominent; anterior 

 fovea external to the sulci much longer than usual, assuming the 

 form of a second sulcus; antennae as long as the elytra, fuscous, very 

 gradually testaceous basally, the medial joints barely twice as long 

 as wide; prothorax relatively small, a fifth wider than long, narrower 

 at base than at the truncate apex; base three-fourths the maximum 



