92 NORTH AMERICAN 



The long pubescence, highly polished surface, and remarkably 

 coarse and irregular sculpture of the elytra, Avill at once distinguish 

 this species. 



71. S. Olistnisiis n. sp. — Form rather slender. Pubescence rather 

 short, sparse, somewhat coarse, sub-recumbent, cinereous. Head small 

 and robust, scarcely twice as wide as long ; interocular surface nearly twice 

 as wide as the eye, flat : longitudinal sulfations very feeble ; intermediate 

 surface slightly wider than the lateral portions, very feebly and evenly 

 convex, summit very narrowly impunctate ; punctures coarse, very closely 

 crowded and somewhat polygonal in outline ; ocular lines meeting at one 

 length in advance ; antennae much longer than the width of head, basal 

 joint black, remainder rather pale piceous-brown, slender, club distinct; 

 third joint one-fourth as long again as the fourth, fourth and fifth equal, 

 sixth and seventh joints much shorter, equal in length, the latter much 

 more robust, clubbed, eighth shorter and much more robust than the 

 seventh, slightly broader than long, sub-triangular, joints of club nearly 

 equal in width, slightly increasing in length, ninth and tenth very slightly 

 broader than long ; maxillary palpi moderate, first joint rather pale piceo- 

 testaceous, second slightly darker, piqeous-brown, third darker, nearly 

 piceous-black. Prothorax widest slightly before the middle, where it is 

 five-sixths as wide as the head and one-sixth narrower than long ; sides 

 thence feebly convergent posteriorly and distinctly sinuate, very slightly 

 convergent anteriorly and feebly sinuate : anterior angles rounded ; anterior 

 margin longer than the posterior, equally arcuate; surface distinctly and 

 longitudinally tuberculate near the basal angles, broadly and very feebly 

 swollen about the centre of the pronotum, punctures moderate in size, vari- 

 form, very closely crowded, deep, smaller, and more crowded near the base, 

 larger and more isolated near the middle: interspaces narrow, very convex, 

 polished. Elytra at base as wide as the head ; sides rather feebly divergent 

 posteriorly, longer than the Width at base, rather strongly arcuate ; together 

 broadly, somewhat angularly and deeply emarginate behind; suture dis- 

 tinctly longer than the pronotum ; surface rather feebly impressed on the 

 suture toward the base, and also near the humeral angles, rather coarsely 

 and feebly, closely and exceedingly irregularly punctured and channeled ; 

 interspaces narrow, very convex, and shining. Abdominal segments decreas- 

 ing uniformly and exceedingly gradually in width, first slightly narrower 

 than the contiguous elytra ; surface rather sparsely, finely, and evenly punc- 

 tulate ; transverse carinae 4-cuspid, broadly arcuate, cusps very small, equal 

 in length and equidistant, acuminate at tip, somewhat rudimentary. Legs 

 moderate, slender, piceous-black ; first joint of posterior tarsi equal in length 

 to the width of the mentum at base. 



Mule. — Fifth ventral segment just perceptibly and roundly emarginate in 

 the middle, contiguous surface without trace of impression or flattening; 

 sixth segment broadly sinuate at tip, sinus broader and more feebly rounded 

 than the apices, evenly rounded throughout, nearly six times as wide as deep ; 

 seventh narrow, transversely truncate at tip, lateral setae well developed. 



Female. — Unknown. 



Length 3.1 mm. 



