COLEOPTERA. 27 



In this species the vortex arrangement of the elytral sculpture may 

 be seen in a highly developed state. In none other of our species is 

 it so conspicuous. 



12. S. tristis n. sp. — Form moderately robust. Pubescence short, mode- 

 rately close, evenly distributed, semi-erect, rather fine, plumbo-cinereous. 

 Head moderate, ratlin- robust, twice as wide as long ; interocular surface 

 nearly flat, twice as wide as the eye, longitudinal elevation as wide as the 

 lateral portions, feebly and evenly convex ; punctures small, round, rather 

 close, sub-variolate, evenly distributed, isolated ; ocular lines meeting at one 

 length in advance; antennae very dark pieeous-brown or piceous-black ; 

 third joint distinctly longer than the second. Prothorax robust, widest at 

 slightly more than one-third of its length posteriorly, where it is nearly as 

 wide as the head, and just perceptibly narrower than long; sides rathei 

 strongly convergent posteriorly and nearly straight ; anterior margin slightly 

 longer than the posterior, nearly equally arcuate ; surface feebly tubereulate 

 near the basal angles, very feebly so near the apical angles, upper surface 

 of pronotum nearly flat; punctures small, very variable in shape and size, 

 close, rather evenly distributed, seldom coalescent, interspaces narrow, 

 slightly convex and feebly polished : canaliculation very short, nearly as 

 broad as long, beginning at the middle, and one-fifth as long as the pro- 

 notum, very feebly impressed, bottom punctate. Elytra at base as wide or 

 just perceptibly wider than the head; sides rather feebly divergent poste- 

 riorly, longer than the width at base, very feebly and evenly arcuate ; 

 together broadly and very feebly emarginate behind ; suture one-third 

 longer than the pronotum ; surface very feebly impressed along the suture. 

 more particularly toward the base, feebly convex, closely, somewhat feebly, 

 finely, and irregularly punctate, punctures generally variable in shape ami 

 size, seldom actually coalescent near the base, where they are closely crowded, 

 polygonal in some places, isolated and round in others, more coalescent poste- 

 riorly ; spiral near the apex and outer edge, very indefinite and feeble. 

 Abdominal segments decreasing nearly uniformly and extremely gradually 

 in width, first just perceptibly narrower than the elytra; surface coarsely, 

 deeply, evenly, and closely punctulate ; punctures impressed, interspaces 

 very convex and highly polished ; transverse carinae tricuspid, middle cusps 

 finely acicular, lateral rather coarsely acuminate, a little shorter and strongly 

 inclined inward. Legs moderate in length, slender, piceous-black ; first 

 joint of posterior tarsi two-thirds longer than the second, slightly shortei 

 than the last, and slightly longer than the next two together. 



Male. — Posterior edge of the fifth ventral segment just perceptibly emargi- 

 nate in its middle third, emargination evenly rounded and not measurable, 

 contiguous surface bearing slight evidences of flattening; sixth segment 

 sinuate at apex, sinus narrower than the apices, and more acutely rounded, 

 slightly more than twice as wide as deep ; seventh segment very feebly and 

 roundly emarginate at tip. 



/•', i, idle. — Unknown. 



Lenath 3.3 mm. 



