222 BULLETIN" 14 5, UNITED STATES NATIONAL MUSEUM 



Head with the front wide, nearly flat, slightly wider at top than at 

 bottom, the lateral margins broadly, arcuately expanded at vertex, 

 with a narrow, longitudinal groove extending from the occiput to 

 middle of front, and narrowly, transversely depressed behind the 

 epistoma; surface densely, coarsely punctate, coarsely rugose, the 

 rugae more distinct posteriorly, and rather densely clothed with 

 long, erect, inconspicuous hairs; epistoma feebly transverse between 

 the antennae, strongly elevated, and with a semicircular emargination 

 in front ; antennae extending to basal third of pronotum, serrate from 

 the fourth joint, and the outer joints slightly longer than wide; eyes 

 large, rather narrowly oblong, and slightly more broadly rounded 

 beneath than above. 



Pronotum about one-half wider than long, about equal in width 

 at base and apex, and widest at middle; sides arcuately expanded to 

 middle, then strongly, sinuately narrowed to near the posterior 

 angles, where they are parallel; when viewed from the side the 

 marginal carina is slightly sinuate anteriorly, the submarginal carina 

 straight, and the two carinae connected to each other near the base; 

 anterior margin strongly sinuate, with the median lobe broadly 

 rounded; base strongly emarginate at the middle of each elytron, 

 the median lobe broadly rounded, and truncate in front of scutellum ; 

 disk moderately convex, broadly, obsoletely, transversely depressed in 

 front of middle and toward the base, a broad, shallow depression on 

 each side along lateral margin, extending from middle to base, and 

 with a distinct, arcuate prehumeral carina, extending from base to 

 near the middle; surface densely, finely, transversely rugose, finely, 

 densely punctate between the rugae, and clothed with a few short, 

 inconspicuous hairs. Scutellum strongly, transversely carinate, and 

 the surface finely, densely reticulate. 



Elytra distinctly wider than pronotum at base, and slightly wider 

 at base than behind the middle; sides nearly parallel for a short 

 distance behind the base, feebly, arcuately constricted in front of 

 middle, arcuately expanded behind the middle, then obliquely nar- 

 rowed to the tips, which are separately, narrowly rounded, and 

 strongly serrulate; sides of abdomen narrowly exposed above; disk 

 moderately convex, and with broad, deep basal depressions; surface 

 finely, densely imbricate-punctate, and without distinct pubescence. 



Abdomen beneath finely, densely punctate, the punctures connected 

 transversely by more or less distinct sinuate lines toward the sides, 

 more coarsely on the basal segment, and rather densely, uniformly 

 clothed with short, recumbent, whitish hairs; first segment feebly 

 convex, without a median groove; last segment broadly rounded at 

 apex; vertical portions of segments not conspicuously pubescent; 

 pygidium strongly carinate, but the carina not projecting. Pro- 



