32 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



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

 bottom, the lateral margins feebly expanded from bottom to top, 

 and with a broad, deep, longitudinal depression extending from the 

 occiput, to epistoma, the depression deepest on the vertex; surface 

 coarsely, sparsely punctate on the front, becoming coarsely rugose 

 on the vertex and occiput, and sparsely clothed behind the epistoma 

 with a few short, semierect, whitish hairs; epistoma rather narrow 

 between the antennae, a broad, deep, arcuate emargination at the 

 middle, and with the anterior margin transversely truncate on each 

 side of the emargination ; antennae extending beyond middle of 

 pronotum, serrate from the fourth joint, and the outer joints as 

 wide as long; eyes large, strongly elongate, and about equally 

 rounded above and beneath. 



Pronotum nearly one-half wider than long, slightly narrower at 

 base than apex, and widest at apical third; sides freely arcuately 

 rounded from apical angles to basal third, then obliquely narrowed 

 to the posterior angles, which are rectangular; when viewed from 

 the side, the marginal and submarginal carinae are rather strongly 

 sinuate, narrowly separated anteriorly, and connected to each other 

 near the base; anterior margin strongly sinuate, with the median 

 lobe broadly rounded; base feebly emarginate at middle of each 

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

 disk moderately convex, with a rather deep, transverse, concave 

 depression on basal half, a very broad, deep depression along the 

 lateral margin at middle, and without any trace of prehumeral 

 carina; surface coarsely, densely, transversely rugose, and with 

 numerous fine punctures between the rugae. Scutellum strongly, 

 transversely carinate, and the surface finely reticulate. 



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

 at base and apical third, rather deeply, broadly, arcuately con- 

 stricted in front of middle, and arcuately narrowed from apical 

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

 serrulate; sides of abdomen slightly exposed above; disk slightly 

 flattened, sutural margins strongly elevated posteriorly, with broad, 

 deep basal depressions, and without trace of longitudinal costae; 

 surface densely, finely granulate-punctate. 



Abdomen beneath coarsely punctate, and finely granulose on the 

 basal segment, becoming sparsely, finely punctate toward the apex, 

 the punctures connected transversely by fine, sinuate lines, and 

 sparsely clothed with very short, whitish hairs ; first segment broadly, 

 longitudinally concavt at middle, second with a moderately broad, 

 deep, smooth groove at the middle, the groove slightly wider anteri- 

 orly, and extending from the anterior margin to behind middle of 

 segment ; vertical portions of segments sparsely pubescent ; pygidium 

 coarsely punctate, with the median carina strongly elevated, narrow, 



