468 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Fronotum proper about as wide as long, lateral margins thin and 

 moderately foliaceous, more or less reflexed and concave; di'^c rather 

 moderately convex, finely and rather sparsely punctate, laterally 

 more densely so, each puncture with a short curved seta ; ajjex rather 

 deeply and somewhat semicircularly emarginate, the emargination 

 about three times Avider than deep, not noticeably margined; akles 

 evenly rounded, margin not widening at base ; haM' quite truncate, 

 and about equal to the apex, with a distinct marginal bead; apical 

 angles obtuse, formed by the moderately advanced foliaceous mar- 

 gins, and are about half as long as the head: basal angles broadly 

 rounded, slightly more prominent posteriorly than the middle of the 

 base. 



Pro'pleurw smooth and quite impunctate. 



Elyfrd elongate oval, nearly twice as long as wide, margins acute, 

 slightly reflexed and alirays attdimiif/ f/ie apex; base quite truncate, 

 much wider than the contiguous prothoracic base proper; huineral 

 margins rather broadly rounded, not anteriorly prominent, humeri 

 proper obtuse ; sides feebly arcuate or subparallel in basal half, thence 

 to apex quite evenly and broadly arcuate, apex more or less acute 

 and produced ; disc quite plane or feebly concave, sometimes biconcave 

 by elevation of suture in posterior half, more or less arcuately de- 

 clivous posteriorly, acutely inflexed laterally, infiexed sides quite 

 straight and oblique; surface sculptured with subasperate punctures 

 which may be rather densely placed and more or less irregularly 

 arranged, at times somewhat serially so, occasionally the punctures 

 are not asperate and rather coarse; inflexed sides irregularly and 

 more or less densely punctate. 



Epipleura^ narrow, not in the least dilated at base, very gradually 

 narrowed to apex, smooth and impunctate; superior margin well 

 defined in apical fourth, thence to base by a series of punctures, 

 surface on the same plane as the inflexed sides of the elytra ; widening 

 at apex to become the inferior surface of the more or less produced 

 apex. 



Sterna quite smooth and more or less impunctate. 



Parapleural rather sparsely and more or less indistinctly punctate. 



Abdomen smooth, very sparsely and more or less indistinctly imuic- 

 tulate, obsoletely rugulose; third segment scarcely oblique, others 

 horizontal. 



Legs moderate in length, rather slender. Profemora mutic as 

 usual, tibial spurs similar and protarsi sim])le in the sexes. 



Male. — Somewhat narrow. Antenna? reaching considerably beyond 

 base of the prothorax. P^lytral disc more or less gradually declivous 

 behind, apex produced into a short cauda, which may be angulate at 

 the sides Avhere the inflexed sides terminate; cauda more or less 

 abruptly produced, rather oblique, and more or less asperate, with 



