442 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Male. — Elongate oval. Elytra scarcely wider than the prothorax, 

 moderately convex, arcuately and oblicjuely declivous posteriorly and 

 noticeably attenuate. Abdomen moderately oblique, not strongly 

 convex, more or less broadly and obsoletely impressed on first two 

 segments. Anterior femora armed with an obtuse tooth or sim]:)ly 

 sinuate. Anterior tarsi with the first joint slightly thickened at tip 

 beneath, with small acute tufts of modified spinules at the apico- 

 marginal angles; the tufts do not completely obliterate the plantar 

 groove. 



Female. — Robust. Elytra broadly oval and noticeably wider than 

 the prothorax, convex, less attenuate at apex, arcuately and quite 

 vertically declivous posteriorly. Abdomen rather strongly convex. 

 Profemora slightly sinuate and with a small obtuse tooth, or entirely 

 mutic. Protarsi with the basal joint distinctly thickened at tip be- 

 neath, and bearing a small tuft of modified spinules, plantar groove 

 obliterated. 



Measurements. — Males: Length, 16.5-23.5 mm.; width, 7.2-10 mm. 

 Females: Length, 20-23 mm.; width, 9-11 mm. 



Genital characters^ male. — Edeagophore elongately oblong-ovate 

 and more or less arched. 



Basale oblong-oval, moderatel}^ convex and variable ; surface longi- 

 tudinally grooved at middle in apical half. 



Apicale rather elongate, triangular, sides nearly straight, apex not 

 produced; base moderately and distinctly lobed at the middle, sinuate 

 laterally ; dorsal surface moderately convex, with a moderately wide 

 median groove extending from apex nearly to the base. 



Sternite with lobes rather large, each distinctly longer than wide, 

 rounded at apex, with the external margin nearly straiglit in basal 

 half, thence arcuate; surface denselj^ punctate and setose apically, 

 setse moderately long and dense at tip. Membrane not setose across 

 the bottom of the sinus. 



Female. — Genital segment subquadrate in outline exclusive of the 

 apices, well chitinized, apex and dorsal plate continuous internally, 

 not setose. 



Valvula (Plate 4, fig. 1). — Dorsal plate horizontal and oblong; 

 surface varying from feebly concave to slightly convex, occasionally 

 with a few scattered punctures; external margin arcuate in apical 

 moiety and more or less sinuate to the base in basal half, where the 

 submarginal groove is visible from above, making somewhat of a 

 sigmoid curve upon the basal prominence of the lateral plate: in- 

 ternal margin slightly or not at all inflexed and feebly sinuous; 

 apical margin feebly defined from the dorsal s\irface of apex inter- 

 nally, but distinct externally with the angle rectangular or narrowly 

 founded. 



