COLEOPTERA. 47 



Cambridge, Massachusetts, 7; White Firsh Point, Michigan, 1. 

 This very fine species is, with a few exceptions, the most distinct 

 in its sexual characters of any in the genus. 



28. S. rilgifer n. sp. (Fauvel MS.). — Form robust. Pubescence exces- 

 sively short, sub-erect, ratber coarse, sparse, very pale flavo-cinereous. Head 



small, robust, scarcely twice as wide as long ; interocular surface nearly flat, 

 slightly more than twice as wide as the eye, nearly equally trilobed by the 

 deep, acutely rounded sulcations ; intermediate surface strongly and evenly 

 convex ; punctures moderately coarse, deep, so closely crowded as to present 

 simply an extremely rough surface, totally lustreless ; ocular lines meeting 

 at one length in advance ; antennae very slightly longer than the width of 

 head, robust, piceous-black, club distinct ; third joint one-half as long again 

 as the fourth, fourth and fifth equal, sixth slightly longer and much less 

 robust than the seventh, eighth globular, as thick as the seventh, joints ten 

 and eleven nearly equal in length, distinctly longer than the ninth ; maxil- 

 lary palpi very long, piceous-black, clouded slightly darker toward the tip. 

 Prothorax arcuately and evenly increasing in width to a point slightly behind 

 the middle, where it is very slightly narrower than the head, and nearly 

 one-sixth narrower than long ; sides thence moderately convergent posteriorly 

 and strongly sinuate ; anterior margin rather strongly arcuate, posterior 

 straight ; surface longitudinally tuberculate along the flanks of the pronotum, 

 particularly near the basal angles, transversely impressed immediately be- 

 hind the anterior margin, longitudinally canaliculated through the middle 

 two-thirds, border of furrow slightly swollen, entire surface rather finely, 

 deeply, and excessively closely sculptured, rough, and lustreless. Elytra 

 at base much wider than the head ; sides nearly parallel, slightly longer 

 than the width at base and very feebly arcuate, more so behind ; together 

 broadly, roundly, and distinctly emarginate behind ; suture slightly more 

 than one-fourth as long again as the pronotuni ; surface of each elytron 

 slightly swollen near the middle of the base, finely, excessively closely, 

 and irregularly punctured and channeled, lustreless. Abdominal segments 

 decreasing uniformly and very gradually in width, first just perceptibly 

 narrower than the contiguous elytra ; surface nearly lustreless ; punctures 

 extremely close, very coarse, polygonally compressed, slightly finer and 

 more isolated toward the tip ; transverse carinae tricuspid, middle cusps 

 long and acicular, lateral equal in length, broad, widening at tip, where 

 they are amalgamated with the general surface. Legs slender, piceous- 

 black ; first joint of the posterior tarsi three-fourths as long again as the 

 second, and equal in length to the last, second much longer than the third, 

 third and fourth sub-equal. 



Mate. — Fourth ventral segment feebly flattened in the middle at apex ; fifth 

 segment emarginate in its middle third at apex, emargination evenly rounded, 

 twelve times as wide as deep, contiguous surface impressed through one-half 

 its length anteriorly, sides of impressed area acutely ridged, coarsely setose, 

 and terminating posteriorly in well-marked acute teeth, bottom of impression 

 nearly flat and impunctate toward the emargination ; sixth segment triangu- 



