COLEOPTERA. 16 



deep and triangular. Legs moderate in length, rather robust, piceo-fuscous ; 

 first joint of posterior tarsi one-half longer than the second, as long as the 

 fifth, second joint rather shorter than the next two together. 



Male. — Fifth ventral segment emarginate in its middle third at apex, 

 emargination evenly rounded, and ten times as wide as deep, contiguous 

 surface deeply impressed, impression in the form of an oval, distinctly longer 

 than wide, the sides being very declivous on all sides except posteriorly, 

 where the emargination forms its outlet, the sides become acutely ridged 

 posteriorly, and terminate at the ends of the emargination in acute teeth, 

 projecting slightly behind the segment, the bottom of the oval, crater-like 

 impression is fiat, minutely reticulated and pubescent ; sixth segment sinuate 

 at apex, sinus narrower than the apices, broadly rounded at the bottom, 

 rather abruptly terminated behind, and about one-half wider than deep ; 

 seventh segment roundly, rather deeply and evenly emarginate at tip. 



Ft male. — Unknown. 



Length 4.8-5.0 mm. 



Lake Tahoe, Nevada, 1 ; California, 1 ; Tenino, Washington Ter- 

 ritory, 1. 



One of the finest species of the genus, and surpassed by none in 

 the singularity and distinctness of its sexual characters. The pro- 

 thorax, also, has more striking and salient characters than perhaps 

 any other species ; the strong flattening of the third palpular joint is 

 a character seldom seen in this tribe. 



9. S. laccopllilus 11. sp. — Form robust. Pubescence short, coarse, 

 evenly distributed, semi-erect and pale fiavate on tin? abdomen, cinereous, 

 and much less conspicuous on the remainder of the upper surface. Head 

 moderate, twice as wide as long ; interocular surface very feebly convex, two 

 and three-fourths times as wide as the eye; longitudinal elevation narrower 

 than the lateral portions, very strongly and evenly convex, prominent, sulca- 

 tions prominent ; punctures rather large, evenly distributed, deep, rounded, 

 seldom coalescent, interspaces feebly shining; ocular lines meeting at one 

 and one-half lengths in advance : antennae scarcely longer than the width 

 of head, rather robust, piceous-black, club distinct and densely pubescent : 

 third joint two-fifths longer than the fourth, fourth and fifth joints equal, 

 sixth and seventh equal in length, the latter much thicker and narrow at 

 the base, eighth slightly longer than broad, very robust, joints of club 

 slightly increasing in length, very robust ; the five outer joints are suddenly 

 much more thickly pubescent than the preceding ; maxillary palpi mode) ati 

 in length, first joint fiavate, second dark piceous-brown, third black, first 

 two joints unusually robust, third unusually thin and short. Prothorax 

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

 just perceptibly narrower than long; sides thence very moderately conver- 

 gent posteriorly and very feebly sinuate ; anterior and posterior margins 

 equal in length, the former arcuate, the latter nearly straight ; surface dis- 

 tinctly and longitudinally tuberculate near the basal angles, longitudinally 

 impressed along the flanks of the pronotum, transversely impressed behind 



