COLEOPTEHA. 120 



as long again as the second, second much longer than the third. Under 

 surface of the abdomen shining and somewhat more coarsely punctulate 

 than the upper. 



Male. — Posterior edge of the sixth ventral segment sinuate, sinus exceed- 

 ingly feeble, one-third as wide as the segment. 



Female. — Unknown. 



Length 2.9 mm. 



Lake Tahoe, Nevada, 1. 



The antennal clubs are missing in the only known specimen. 



108. S. iiiiuiriiiliis n. sp. — Form-moderately robust. Pubescence rather 

 short, cinereous, more abundant on the head and elytra. Head small, three- 

 fourths as wide again as long ; interocular surface very moderately excavated, 

 strongly bisulcate, three times as wide as the eye; finely and variolately 

 punctate; interspaces wider than the punctures, shining ; longitudinal ele- 

 vation as wide as the eye ; ocular lines meeting at one length in advance ; 

 antennae longer than the width of head, piceous-black, rather slender, club 

 large ; third joint twice as long as the fourth, fourth and fifth equal, sixth 

 and seventh equal, much shorter, eighth almost globular, joints of club very 

 gradually increasing in length, tenth slightly thickest ; palpi and oral organs 

 entirely piceous-black. Prothorax very robust, widest a little before the 

 middle, where it is four-fifths as wide as the head ; sides thence convergent 

 posteriorly and slightly sinuate ; surface with a broad transverse impression 

 just behind the anterior margin, and a rather deep oblique impression on 

 each side near the middle ; very finely punctate ; punctures very shallow and 

 variolate ; interspaces wider than the punctures, shining ; anterior margin 

 slightly longer than the posterior. Elytra at base broadly and rather deeply 

 emarginate, slightly wider than the head ; together broadly and just percep- 

 tibly emarginate posteriorly ; suture one-fifth as long again as the pronotum ; 

 sides very slightly divergent posteriorly and moderately arcuate ; surface of 

 each with a broad, irregular, and longitudinal elevation along the middle, 

 punctate like the pronotum. Abdominal segments decreasing rather rapidly 

 in width, first as wide as the contiguous elytra ; border very strong ; surface 

 shining and very finely punctate ; transverse carinae not cusped. Under sur- 

 face of the abdomen very finely and rather closely punctate. Legs black, 

 rather long and slender ; first joint of the posterior tarsi twice as long as the 

 second. 



Male. — Posterior edge of the sixth ventral segment very broadly sinuate, 

 sinus evenly rounded, about one-fifth as deep as wide. 



Female. — Sixth segment very broadly and triangularly produced, surface 

 densely hirsute. 



Length 3.7-4.1 mm. 



Thurston County, Washington Territory, 2. 



109. S. tllberculatllS n. sp. — Form rather slender. Pubescence very 

 long, somewhat dense over the entire surface, pale fuscous in color, erect. 

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



Stenini. 9 



