COLEOPTERA. 165 



small, twice as wide as long; eyes small, genae distinctly visible behind 

 them ; interocular surface more than three times as wide as the eye, feebly 

 convex ; sulcations impressed, rounded at the bottom, distinct ; intermediate 

 surface broadly, evenly, and moderately convex, sligbtly wider than the 

 lateral portions ; punctures minute, round, impressed, evenly distributed, 

 separated by more than twice their widths ; ocular lines meeting at about 

 three lengths in advance; antennae rather short and robust, scarcely longer 

 than the width of head, dark piceo-testaceous, basal joint black, club slightly 

 darker ; joints three, four, and five uniformly and very rapidly decreasing in 

 length, seventh and eighth equal in length, the latter more robust, joints of 

 club small, very feebly compressed ; maxillary palpi short and robust, rather 

 pale piceo-testaceous. Prothorax arcuately, evenly, and moderately rapidly 

 increasing in width to a point slightly in advance of the middle, where it is 

 distinctly narrower than long and five-sixths as wide as the head ; sides 

 thence rather more rapidly convergent posteriorly and straight ; anterior 

 margin slightly longer than the posterior ; somewhat strongly arcuate, the 

 latter nearly straight ; surface above nearly flat, with two feeble tubercula- 

 tions on each side just above the flanks ; punctures very small, impressed, 

 very evenly distributed, distant by nearly twice their own widths ; inter- 

 spaces flat. Elytra at base just perceptibly narrower than the head; sides 

 moderately divergent posteriorly, distinctly longer than the width at base, 

 straight to within a very short distance of the apices, where they are feebly 

 arcuate ; exterior apical angles very acute ; together broadly and somewhat 

 strongly emarginate behind ; suture nearly one-third longer than the pro- 

 notum ; surface rather depressed, confusedly, and irregularly undulated 

 throughout, impressed on the suture, more broadly so toward the base ; 

 punctures small, deeply impressed, round, nearly evenly distributed, sepa- 

 rated by twice their widths ; interspaces nearly flat. Abdominal segments 

 decreasing uniformly and rather gradually in width, first as wide as the 

 contiguous elytra, feebly constricted at base ; surface slightly depressed ; 

 border obsolete except on the first segment, where it is very distinct ; punc- 

 tures small, evenly distributed, as large as those of the pronotum and equally 

 distant ; transverse carinae not cusped. Legs short and slender, black, tarsi 

 distinctly paler ; first joint of the posterior nearly equal in length to the next 

 two together ; third and fourth joints strongly and nearly equally bilobed. 



Male. — Posterior edges of segments two to five emarginate in the middle 

 fifth, emarginations rounded, those of second and fifth segments very feeble, 

 not measurable, not terminated laterally by pronounced angulations, those 

 of the third and fourth stronger and terminated laterally by pronounced, 

 though rounded callosities, contiguous surfaces feebly and cylindrical ly im- 

 pressed ; sixth segment broadly and deeply sinuate at apex, sinus occupying 

 the entire apex, in the form of a broad triangle in which the anterior angle 

 is rounded, and in which the sides are inwardly curvate, twice as wide as 

 deep ; seventh broadly and evenly rounded at apex. 



Female. — Sixth segment very narrow, evenly, and strongly rounded be- 

 hind ; seventh emarginate at tip. 



Length 4.2-5.3 mm. 



