COLEOPTERA. 00 



spaces one-half as wide as the punctures ; canaliculation distinct, impressed, 

 bottom highly polished, sides somewhat indefinitely outlined, beginning 

 slightly before the middle, one-half as long as the pronotum. Elytra at 

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

 posteriorly, distinctly longer than the width at base, very feebly arcuate; 

 together somewhat angularly and distinctly emarginate behind ; suture 

 about as long as the pronotum ; surface convex, nearly even, finely, moder- 

 ately closely, and very evenly punctate ; punctures of different sizes and 

 shapes, interspaces generally as wide as the punctures, feebly convex, and 

 very highly polished. Abdominal segments decreasing uniformly and just 

 perceptibly in width, first as wide as the contiguous elytra ; surface rather 

 finely, sparsely, and very evenly punctulate, highly polished and rather 

 convex; transverse carinae tricuspid, middle cusps moderate in length and 

 finely aciculate, lateral broad, rounded at tips, and rather rudimentary. 

 Legs somewhat long and slender, blackish-fuscous above, reddish-fuscous 

 beneath, tibiae distinctly curvate, especially toward tips ; first joint of poste- 

 rior tarsi one-half as long again as the second, and nearly as long as the last, 

 joints two to four uniformly decreasing in length. 



Male. — Posterior edge of fifth ventral segment emarginate in its middle 

 fourth, emargination evenly rounded, about ten times as wide as deep, with 

 the angles slightly rounded, contiguous surface feebly flattened throughout 

 anteriorly ; sixth segment sinuate at apex, sinus and vertices equal in curva- 

 ture, sinus about two and one-half times as wide as deep. 



Female. — Unknown. 



Length 2.3 mm. 



Detroit, Michigan, 1. 



36. S. ilidigeilS n. sp. — Form rather slender. Pubescence short, moder- 

 ately sparse, semi-erect, flavo-cinereous. Head robust, not twice as wide as 

 long ; interocular surface very slightly depressed, twice as wide as the eye, 

 closely and evenly punctate, a small spot on each side near the base impunc- 

 tate ; longitudinal elevation very much narrower than the lateral portions, 

 very acutely convex, prominent, summit narrowly impunctate ; ocular lines 

 meeting at one length in advance ; antennae dark piceous-brown ; third joint 

 one-third as long again as the fourth, maxillary palpi long, first joint pale 

 testaceous, second darker, third robust, piceous, densely setigerous, and 

 nearly as long as the first two together. Prothorax widest slightly behind 

 the middle, where it is nearly four-fifths as wide as the head and distinctly 

 narrower than long ; sides thence rather strongly convergent posteriorly ami 

 nearly straight; anterior and posterior margins sub-equal in length, the 

 former the more arcuate; surface distinctly and obliquely tuberculate on 

 each side near the base, closely, rather finely, and somewhat confusedly 

 punctate ; canaliculation in the form of an elongated erosion, very indistinct. 

 Elytra at base distinctly narrower than the head ; sides rather strongly 

 divergent posteriorly, equal in length to width of base, and very feebly 

 arcuate; together broadly, roundly, and somewhat strongly emarginate 

 behind ; suture scarcely more than seven-eighths as long as the pronotum 

 surface depressed, very feebly impressed on and near the suture at base 



