COLEOPTERA. 141 



than the lateral portions, evenly and rather strongly convex ; ocular lines 

 meeting atone and one-half lengths in advance; antennae slightly longer 

 than the width of head, piceous-black, very slender, with exception of the 

 first two joints and the club, which are thick; third and fourth joints equal, 

 fifth just perceptibly shorter, sixth and seventh equal in length, tin' latter 

 much thicker, eighth as wide as long, cordate ; last two joints much more 

 robust than the ninth ; maxillary palpi short and robust, first joint flavo- 

 testaceous, second and third piceons-black, third nearly as long as the first 

 two together. Prothorax widest slightly before the middle, where it is three- 

 fourths as wide as the head, and distinctly narrower than long, sides thence 

 vei-y moderately convergent posteriorly and slightly sinuate ; anterior and 

 posterior margins nearly equal in length and curvature ; surface rather 

 coarsely, very closely, evenly, but rather confusedly punctate ; canaliculation 

 very broad, deeply impressed, long and prominent. Elytra at base as wide 

 as the head ; sides nearly parallel, as long as the width at base, moderately 

 arcuate ; together broadly and just perceptibly emarginate behind ; suture 

 nearly one-fifth as long again as the pronotum ; surface evenly convex, 

 coarsely, very closely, irregularly, and confusedly punctured and channeled, 

 isolated punctures being seldom seen. Abdomen nearly cylindrical ; seg- 

 ments uniformly and extremely gradually narrowing behind, first slightly 

 narrower than the contiguous elytra ; border of first distinct at base, that of 

 the remainder extremely narrow, and to be seen with difficulty ; surface 

 coarsely and closely punctulate at base, more finely and sparsely so toward 

 tip ; transverse carinae tricuspid, cusps rather approximate, long, stout, 

 aciculate toward tips, prominent ; lateral slightly inclined inward. Legs 

 rather long and slender, piceous-black ; first joint of the posterior tarsi one- 

 half as long again as the second, slightly longer than the last, second and 

 third sub-equal, fourth thin and oblique. 



Mule. — Posterior edge of the fifth ventral segment just perceptibly sinuate 

 near the middle ; sixth broadly and deeply sinuate at tip, sinus more acutely 

 rounded at the bottom than along the sides, about four times as wide as 

 deep ; seventh narrowly truncate at tip. 



Female. — Unknown. 



Length 2.1 mm. 



Thurston County, Washington Territory, 1. 



This delicate little species bears a considerable resemblance to 

 vesta/is; it differs in the structure of the elytra, in the sculpture, 

 in the tarsal structure, and in size. The remarks made upon the 

 abdominal Iborder of vesta/is will apply with almost equal force here. 



121. S. vacuus n. sp. — Form rather slender. Pubescence short and 

 coarse, rather sparse except in the medial portions of the abdomen, plum- 

 beous except along the abdomen and on the head, where it is conspicuously 

 fulvous. Head moderate, twice as wide as long ; interocular surface mode- 

 rately depressed, more than twice as wide as the eye; longitudinal elevation 

 much narrower than the lateral portions, feebly and evenly convex ; sulca- 

 tions very feeble; punctures rounded, rather close, evenly distributed, and 



