40 NORTH AMERICAN 



21. S. tenuis n. sp. — Form very slender, sides parallel. Pubescence 

 moderately long, fine, recumbent, sparse, pale fulvo-cinereous, more fulvous 

 on the abdomen. Head moderate, twice as wide as long ; interocular surface 

 nearly flat, equally trilobed by the very feeble sulcations ; intermediate sur- 

 face very feebly convex ; punctures moderately coarse, evenly distributed, 

 separated by one-half their own widths, interspaces shining ; ocular lines 

 meeting at one length in advance ; maxillary palpi pale piceous-brown, basal 

 joint opaque, flavate. Prothorax widest slightly in advance of the middle, 

 where it is distinctly narrower than long ; sides rather strongly convergent 

 and just perceptibly sinuate posteriorly, rather less convergent and very 

 feebly arcuate anteriorly ; anterior margin slightly longer and much more 

 arcuate than the posterior ; surface feebly tubercnlate near the basal angles : 

 rather finely, moderately closely, evenly punctured ; punctures irregular in 

 shape, interspaces rather convex, highly polished ; canaliculation just visible 

 as a narrow, very feeble impression, about one-half as long as the pronotum, 

 terminating at nearly equal distances from the base and apex. Elytra at 

 base just perceptibly narrower than the head; sides moderately divergent 

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

 broadly, roundly, though moderately emarginate behind ; suture very slightly 

 longer than the pronotum ; surface rather depressed, feebly impressed along 

 the suture, more particularly toward the base, coarsely and nearly evenly 

 punctate, interspaces two- thirds as wide as the punctures, feebly convex and 

 highly polished, punctures very seldom coalescent and then only partially so. 

 First three abdominal segments equal in width, and as wide as the contiguous 

 elytra : surface finely, evenly, and rather distantly punctulate ; punctures 

 impressed, interspaces highly polished ; posterior edges of the segments im- 

 punetate : transverse carinae tricuspid, middle cusps long and acicular, lateral 

 very rudimentary. Legs rufo-fascous, moderate in length ; last joint of the 

 anterior tarsi nearly equal in length to the three preceding together. 



Male. — Fifth ventral segment emarginate in its middle fourth at apex, 

 emargination evenly rounded, nearly ten times as wide as deep, contiguous 

 surface feebly impressed throughout anteriorly ; sixth segment triangularly 

 incised at apex, incisure small, slightly wider than deep ; seventh segment 

 feebly and roundly emarginate at apex. 



Female. — Unknown. 



Length 3.2 mm. 



Grimsby, Ontario, 1. 



The type specimen is in a very dilapidated condition, lacking the 

 antennae and posterior tarsi. The species differs from dlfficilis in its 

 much more slender form, sexual characters, and sculpture. 



22. S. ailglistus n. sp. — Form slender, sides parallel. Pubescence 

 sparse, short, line, sub-recumbent, rather inconspicuous. Head moderate, 

 twice as wide as long ; interocular surface more than twice as wide as the 

 eye, nearly flat, equally trilobed by the very feebly longitudinal sulcations, 

 intermediate surface rather feebly and evenly convex ; punctures moderately 

 small, rounded, not coalescent, evenly distributed and "close ; ocular lines 



