174 BULLETIN" 14 5, UNITED STATES NATIONAL MUSEUM 



Male. — Form elongate, rather slender, and moderately flattened 

 above; head, pronotum, and beneath bronzy green; elytra blackish, 

 with a distinct purplish tinge. 



Head with the front rather narrow, about equal in width at top 

 and bottom, the lateral margins nearly parallel to each other, and 

 with a broad, deep depression extending from the occiput to 

 epistoma, the depression becoming triangular behind the epistoma; 

 surface somewhat rugose, densely, coarsely punctate, the punctures 

 more or less confluent, and sparsely clothed with semierect, incon- 

 spicuous hairs; epistoma not transverse between the antennae, and 

 very broadly, deeply, arcuately emarginate in front ; antennae 

 extending to middle of pronotum, serrate from the fourth joint, and 

 the outer joints about as wide as long; eyes moderately large, broadly 

 oblong, and about equally rounded above and beneath. 



Pronotum nearly one-half wider than long, equal in width at base 

 and apex, and widest near the middle; sides slightly arcuately 

 rounded ; when viewed from the side the marginal and submargmal 

 carinae are feebly sinuate, narrowly separated anteriorly, and con- 

 nected to each other near the base ; anterior margin strongly sinuate, 

 and the median lobe strongly rounded ; base transversely truncate to 

 middle of each elytron, with the median lobe feebly produced and 

 broadly rounded ; disk moderately convex, with a broad, deep median 

 depression extending from near anterior margin to base, and consider- 

 ably broader behind than in front, a broad, deep depression on each 

 side extending from the lateral margin at apical third obliquely back- 

 ward to the middle, without prehumeral carinae, which are replaced at 

 the posterior angles by a round swelling, with a round fovea behind it 

 close to the base; surface irregularly rugose, and rather coarsely, 

 irregularly punctate between the rugae. Scutellum not transversely 

 carinate, but the surface deeply impressed at the middle, and finely 

 reticulate. 



Elytra about as wide as pronotum at base, and slightly wider at 

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

 tance behind base, feebly, broadly constricted in front of middle, 

 feebly, broadly expanded behind the middle, then obliquely narrowed 

 to the tips, which are separately, rather narrowly rounded, and finely 

 serrulate; sides of abdomen narrowly exposed above; disk slightly 

 flattened, with a vague costa extending from the humerus to near 

 apex, feebly, longitudinally depressed on each side of the suture,, 

 which is strongly elevated posteriorly, and with broad, moderately 

 deep basal depressions; surface rather finely, densely imbricate- 

 punctate, and without distinct pubescence. 



