128 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



green, sometimes with a distinct aeneous tinge, and more shining 

 than above. 



Head with the front rather wide, nearly flat, distinctly narrower 

 at bottom than at top, rather deeply impressed or concave on the 

 vertex and occiput, lateral margins arcuately expanded at the mid- 

 dle, and with a narrow longitudinal groove extending from the 

 occiput to middle of front; surface coarsely, densely punctate on 

 the front, becoming rugose on the occiput, and sparsely clothed with 

 short, obsolete, whitish hairs ; epistoma narrow between the antennae, 

 and broadly, arcuately emarginate in front; antennae extending to 

 about middle of pronotum, serrate from the fourth joint, and the 

 outer joints usually slightly longer than wide; eyes large, and 

 slightly more broadly rounded beneath than above. 



Pronotum nearly one-half wider than long, base and apex about 

 equal in width, and widest at middle; sides regularly, arcuately 

 rounded ; when viewed from the side the marginal carina is strongly 

 sinuate, the submarginal carina less strongly sinuate, the two carinae 

 rather narrowly separated anteriorly, and connected to each other at 

 the base; anterior margin feebly sinuate, with a broadly rounded 

 median lobe; base rather deeply emarginate at middle of each 

 elytron, the median lobe broadly rounded, and truncate in front 

 of the scutellum; disk moderately convex, with a median depression 

 divided at the middle, the anterior part usually obsolete and the 

 posterior part distinct and more deeply and broadly impressed, 

 sometimes with a small depression on each side toward anterior 

 margin, a small depression on each side along base near posterior 

 angles, a broad, deep depression along lateral margins, and without 

 distinct prehumeral carinae; surface coarsely, densely, transversely 

 rugose, densely punctate between the rugae, and without distinct 

 pubescence except sometimes in the lateral depressions. Scutellum 

 transversely carinate, and the surface finely reticulate. 



Elytra slightly wider than pronotum at base, and about equal in 

 width at base and apical third; sides nearly parallel for a short 

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

 middle, arcuately expanded at apical third, then obliquely attenuate 

 to the tips, which are separately, rather broadly rounded, and strongly 

 serrulate; sides of abdomen broadly exposed above; disk strongly 

 flattened, sometimes the junction of the discal flattened portion with 

 the convex sides of the elytra has the appearance of an obtuse costa, 

 sutural margins slightly elevated near the apex, and with broad, 

 deep, basal depressions ; surface coarsely, densely imbricate-punctate, 

 and without distinct pubescence. 



Abdomen beneath rather densely, finely punctate, densely, trans- 

 versely rugose at sides of basal segment, sparsely clothed with short, 

 recumbent, whitish hairs, and usually with a slightly more densely 



