72 NORTH AMERICAN 



53. S. pterol>racliys G-. and H. — Form moderately slender. Pubes- 

 cence very fine, long, sparse, and recumbent, cinereous. Head large, slightly 

 more than twice as wide as long ; interocular surface flat near the eyes, not 

 twice as wide as the eye, finely, variolately, and somewhat distantly punctate 

 near tin' eyes, wholly impnnctate in the middle third; longitudinal eleva- 

 tion wider than the. lateral portions, evenly and very strongly convex, very 

 prominent ; ocular lines meeting at one length in advance ; antennae scarcely 

 longer than the width of head, slender, flavato, last two joints infuscate, 

 club moderate; third joint one-half as long again as the fourth, fourth and 

 fifth equal, eighth sub-globular; maxillary palpi ilavate, last joint very 

 slender. Prothorax very robust, widest very slightly before the middle, 

 where it is four-fifths as wide as the head, and as broad as long; sides 

 thence very moderately convergent posteriorly and nearly straight; anterior 

 margin slightly longer and more evenly rounded than the posterior : surface 

 very faintly tuberculate at the sides near the base, minutely, feebly, dis- 

 tantly, and evenly punctate ; canaliculation fusiform, deeply impressed, two- 

 thirds as long as the pronotum, terminating near the posterior margin. 

 Elytra at base narrower than the head ; sides strongly divergent posteriorly 

 and very strongly arcuate, as long as the width at base; together broadly 

 and rather strongly emarginate behind; suture distinctly shorter than the 

 pronotum ; surface broadly and feebly impressed along the suture, very 

 feebly and somewhat distantly, but confusedly punctured. Abdominal seg- 

 ments decreasing uniformly, but very gradually in width, first as wide as 

 the contiguous elytra : surface broadly convex, feebly and rather distantly 

 punctulate ; transverse carinae not cusped. Legs moderate, Ilavate through- 

 out ; first joint of the posterior tarsi twice as long as the second, and as long 

 as the next three together, last joint very short. 



Male. — Unknown. 



Female. — Sixth ventral segment acutely produced at apex, cusp prominent. 



Length 2.4-2.7 mm. 



Alaska, 2. 



This is the S. brevipennis, of Maklin, and is so distinct that, 

 although I have born unable to describe the male characters, its 

 identification will always be very easy. 



54. S. corvus n. sp. (Schwarz MS.). — Form rather robust. Pubescence 

 very short, sparse, sub-erect, rather coarse, piceo-cinereous : Ilavate on the 

 abdomen, where it is much more dense toward the margins. Head moderate, 

 robust, twice as wide as long; interocular surface three times as wide as the 

 eye, very moderately depressed, nearly equally trilobed by the longitudinal 

 sulcations, which are rather feeble ; intermediate surface rather feebly con- 

 vex ; punctures extremely close and contused, surface evenly though coarsely 

 roughened, lustreless ; ocular lines meeting at somewhat more than one 

 length in advance, strongly curvate anteriorly ; eyes narrow ; antennae 

 slightly longer than the width of head, slender, club large, basal joint 

 black, second somewhat paler, remainder piceous-brown ; third joint one- 

 third as long again as the fourth, fourth and fifth equal, sixth and seventh 



