30 NORTH AMERICAN 



rower than the contiguous elytra; surface somewhat narrowly and strongly 

 convex, finely, feebly, evenly, and distantly puuctulate, interspaces highly 

 polished ; transverse carinae tricuspid, cusps all rounded, broad, somewhat 

 prominent, and becoming amalgamated with the general surface of the seg- 

 ment. Legs long and slender, pale rufo-piceous ; first joint of posterior tarsi 

 more than three times as long as the second, and twice as long as the fifth, 

 joints two to four uniformly and gradually decreasing in length. 



Mule. — Surfaces of the third and fourth ventral segments flattened through- 

 out their middle fourth and third respectively, edges of flattened area provided 

 with very long downwardly and inwardly curvate setae, edges of segments 

 scarcely modified ; fifth segment emarginate in its middle third at apex, 

 emargination evenly rounded throughout, slightly more than four times as 

 wide as deep, contiguous surface deeply and cylindrically impressed through- 

 out anteriorly, borders of impression having setae similar to those of the third 

 and fourth segments ; sixth segment sinuate at apex, sinus scarcely one-half 

 as wide as the apices, acutely rounded at bottom and at the exterior angles, 

 slightly wider than deep : seventh segment very deeply, hroadly, and roundly 

 emarginate at apex, teeth well developed, directed inward. 



Female. — Unknown. 



Length 4.4 mm. 



Southern States (locality not specified), 1. 

 A very distinct and unmistakable species. 



15. S. delawarensis n. sp.— Form slender. Pubescence very short 

 and fine, longer on the abdomen, where it is recumbent, fusco-cinereous. 

 Head moderate, twice as wide as long ; interocular surface nearly flat, two and 

 one-half times as wide as the eye, equally trilobed by the distinct sulcations, 

 intermediate surface rather strongly and evenly convex ; punctures round, 

 minute, and evenly distributed, interspaces as wide as the punctures, polished ; 

 ocular lines meeting at one and one-half lengths in advance ; antennae slen- 

 der, slightly longer than width of head, piceous, basal joints darker, club 

 moderate : third joint one-third as long again as the fourth, fourth ami fifth 

 equal in length, seventh twice as long as the eighth, joints of club increasing 

 in length, last joint acuminate at tip ; maxillary palpi piceous, first joint 

 paler. Prothorax widest before the middle, where it is one-fifth narrower 

 than long ; sides thence feebly convergent posteriorly and nearly straight ; 

 posterior margin slightly longer than the anterior, equally arcuate ; surface 

 with two rudimentary tuberculations at each side, very feebly, minutely, 

 and somewhat irregularly punctate, interspaces generally twice as wide as 

 the punctures, shining ; canaliculation well marked, fusiform, bottom round- 

 ing, commencing before the middle and extending posteriorly a distance 

 equal to one-half the total length, deeper posteriorly. Elytra at base about 

 as wide as the head ; sides feebly divergent posteriorly and very feebly 

 arcuate, about equal in length to width at base ; together very broadly and 

 somewhat feebly emarginate posteriorly ; suture equal in length to pronotum ; 

 surface slightly impressed on the suture, rather depressed, very unevenly 

 punctured, near the inner basal angles the punctures are very fine and 

 round, interspaces twice their width, shining; near the outer apical angles, 



