298 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Pronotum subqiiadrate, one-sixth wider than long, slightly nar- 

 rowed behind, widest at or just in advance of the middle; disc mod- 

 erately convex, sparsely, very finely and indistinctly punctnlate; 

 o.jyex slightly emarginate to subtruncate, finely and more or less ob- 

 soletely margined; sides slightly and evenly arcuate anteriorly, and 

 more or less oblique posteriorly, sometimes slightly sinuate before the 

 basal angles, finely margined ; base feebly arcuate and finely beaded, 

 about one-seventh wider than \\\q apex; apical angles more or less 

 distinct, acute, not everted although sometimes feebly reflexed; basal 

 angles obtuse, not rounded. 



Propleurw smooth, obsoletely punctate and more or less rugulose. 



Elytra elongate oval, widest at the middle ; hase feebly emarginate, 

 very slightly wider than the contiguous prothoracic base; humeri 

 obtuse, not prominent nor rounded ; sides evenly arcuate or subpar- 

 allel, attenuate posteriorly and arcuately declivous with the apex 

 more or less caudate; disc slightly and evenly convex on the dorsum, 

 more strongly so and broadly rounded laterally, punctate, punctures 

 fine and more or less indistinct and arranged in series, sometimes 

 feebly impressed, intervals with a single row of fine, widely spaced 

 punctures, which are generally simple, but may become small asperi- 

 ties on sides about apex. 



Efipleurw moderate in width beneath the humeri and gradually 

 narrowing to the apex; surface smooth and more or less obsoletely 

 punctulate. 



Sterna rather smooth and more or less obsoletely punctate and 

 rugose. 



Parapleurce more or less coarsely and obsoletely punctate. 



Abdomen horizontal, somewhat shining, indistinctly, sparsely 

 punctulate, and more or less transversely rugulose. 



Lec/s rather long and moderate in thickness; anterior femora 

 armed in one sex at least; anterior tibial spurs subequal and rather 

 stout. Tarsi similar in the sexes with the spinules beneath moder- 

 ately stout. 



Male. — Body slightly robust. Elytra arcuately and obliquely de- 

 clivous behind, prolonged into a narrow, horizontal cauda, whose 

 imder surface is a part of the general internal surface of the elytra, 

 the epipleura^ passing narrowly along the sides to tip, the latter 

 slightly decurved. Abdomen feebly and broadly impressed at middle, 

 especially on the second segment. Anterior femora Avith an acute and 

 rather stout tootli at outer fourth; anterior libia^ more or less con- 

 stricted at base. Middle and posterior femora simple; posterior 

 tibiae frequently slightly arcuate and narrow in basal half, generally 

 more or less abruptly dilated in apical moiety; both the middle and 

 hind tibiae generally with the surface quite asperate in apical half. 



