110 NORTH AMERICAN 



apex, sinus evenly rounded, extending through nearly the entire segmental 

 width, ten to twelve times as wide as deep. 



Female. — Unknown. 



Length 3.0 mm. 



California, 1. 



The antennae are missing with exception of the first two joints, 

 and the maxillary palpi are also wanting. 



The species somewhat resembles milleporus and vinnuhis, but 

 differs from both in the relative lengths of the elytra and prothorax, 

 and from the latter in addition, by its much narrower head and dense 

 pubescence. 



S6. S. sectilifer n. sp. — Form moderately robust. Pubescence of head, 

 pronotum, and elytra so fine and sparse as to be scarcely visible, cinereous ; 

 that of abdomen also very fine, semi-erect, and exceedingly sparse, cinereous. 

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

 equally trilobed by the longitudinal sulcations, which are just apparent; 

 evenly punctate ; punctures small and impressed ; interspaces slightly wider 

 than the punctures, highly polished ; ocular lines meeting at one and one- 

 half lengths in advance ; antennae slightly longer than the width of head, 

 slender, dark fuscous, club moderate; third joint one-fifth as long again as 

 the fourth, joints four to seven gradually decreasing in length, joints of club 

 gradually increasing in length, ninth much narrower than the last two, 

 eleventh acuminate at tip ; first five joints nearly glabrous ; maxillary palpi 

 slender, first joint testaceous, second darker, third black. Prothorax widest 

 slightly before the middle, where it is much wider than the interocular sur- 

 face, sides thence nearly parallel posteriorly and sinuate, length one-eighth 

 greater than the width ; anterior margin shorter and much more arcuate 

 than the posterior ; surface evenly convex, with a narrow, shallow and equal, 

 longitudinal canalieulation, terminating at a very short distance from either 

 margin ; rather finely punctured and transversely regulose ; interspaces 

 highly polished. Elytra at base much wider than the head, sides almost 

 parallel and slightly arcuate, more so posteriorly ; together broadly and very 

 feebly emarginate behind ; length of suture slightly greater than that of the 

 pronotum ; surface generally convex, with a slight oblique impression just 

 before the middle of each, and another near the outer apical angle ; quite 

 evenly punctate ; punctures small and deeply impressed ; interspaces much 

 wider than the punctures, highly polished. First three abdominal segments 

 nearly equal in width, and almost imperceptibly narrower than the elytra 

 behind ; surface highly polished, finely and distantly punctulate ; transverse 

 carinae acutely and finely 4-cuspid, intervals sinuate. Legs short, black, 

 femora and tibiae nearly glabrous, tarsi slightly paler ; first joint of posterior 

 three-fourths as long again as the second, second much longer than the third. 

 Under surface of the abdomen punctate like the dorsal surface. 



Male. — Unknown. 



Female. — Posterior edge of sixth ventral segment evenly rounded. 



Length 3.8 mm. 



District of Columbia, 1. 



