356 BULLETIN ()'.], UNITED STATES NATIONAL MUSEUM. 



siibniuricato-graimlate, subasperately and feebly nigosely so later- 

 ally and on apex. 



Epipleurce somewhat wide, distinctly dilated beneath the humeri, 

 thence gradually narrowing to upex ; superior margins feeble, a little 

 stronger at the humeri, where it is arcuate and more or less visible 

 from above, thence feebly and broadly sinuate for a fourth of its 

 length ; surface smooth, very sparsely and finely punctate. 



Sterna quite densely but not coarsely rugoso-punctate. 



Parapleurw more or less coarsely punctate. 



Abdomen smooth and shining, sparsely and not coarsely punctate, 

 more or less rugulose; quite densely sculptured about the coxte, last 

 two segments less strongly so. 



Lcffs comparatively slender, and about moderate in length. An- 

 terior femora mutic; anterior tibial spurs quite similar in the sexes, 

 the anterior slightly longer and just the least thicker than the pos- 

 terior; anterior and middle tarsi dissimilar in the sexes. 



Male. — Somewhat narrow, subovate. Antenme reaching a little 

 beyond the base of the prothorax. Elytra somewhat feebly convex 

 on the dorsum and rather narrowly rounded at the sides, arcuately 

 and slightly obliquely declivous behind, somewhat distinctly nar- 

 rowed apically. Abdomen more or less ol^lique, moderately convex, 

 first two segments more or less broadly flattened or impressed at 

 middle. Anterior tibia? moderately constricted at base. Anterior 

 tarsi with the first two joints feebly thickened at tips beneath, each 

 with a moderately small truncate tuft of golden pubescence; first two 

 joints of the middle tarsi with very small tufts at tips beneath, grooves 

 feebly interrupted. 



Female. — Robust and ovate. Antenna? scarcelj^ reaching beyond 

 the base of the prothorax. Elytra more or less evenly and arcu- 

 ately declivous, or vertically so posteriorly. Abdomen rather strongly 

 convex and horizontal. Anterior tarsi with the first joint slightly 

 thickened at tip beneath, grooves distinct. 



Two forms may be recognized : 



Forma typica. — Moderate in size, surface somewhat shining, shorter 

 ovate. Elytra submuricato-granulate laterally and on the apex. In 

 the males the elytra are rather obliquely narrowed in apical third; 

 females have the elytra moderately convex on the dorsum. 



Measurements. — Males: Length, 13-14 mm.; width, C-6.5 nun. 

 Females: Length, 13.5-lG mm.; width, 7-8 mm. 



Forma farallonica. — Larger, somewhat dull, slightlv longer ovate, 

 thorax a little more transverse. P^lytra more granulate laterally. In 

 the females the elytra are scarcely more convex than in the male. 



MeasureTnents. — Males: Length, lO-K).;") nmi.; width, 7-7.5 mm. 

 Females: Length, 13-17.5 nnu. ; width, T-8.5 mm. 



