282 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Female. — SomeAvhat robust. Elytra arcuately declivous posteri- 

 orly. Abdomen evenly convex. Anterior femora with an obtuse or 

 subacute tooth. Metatibiaj straight. 



Genital chatacters^ male. — Edeagophore oblong-oval, depressed and 

 not arched. 



Basalc oblong; surface moderately convex and the sides quite 

 parallel. 



Apicale subequilaterally triangular; surface evenly convex, 

 coarsely and sparsely punctate, median groova linear and fine in 

 middle three-fifths; sides feebly arcuate from base to apex, the latter 

 subacute and not produced; base broadly and arcuately lobed at 

 middle, feebly sinuate laterally. 



Sternite transversely subcrescentiform. Each lobe wider than long; 

 external border broadly and evenly arcuate from base to apical 

 angle, Avhich is introrse at the internal margin, the latter short ; angle 

 rounded ; surface moderately convex, quite densely punctate in apical 

 three-fourths; setose, setae quite long and quite dense. Membrane 

 not setose across the bottom of the sinus, the latter short. 



Female. — (xenital segment rather small, setose, and triangularly 

 trapezoidal in outline, moderately short. 



Valrula (Plate 3, fig. 12). — Dorsal plate oblong with sides slightly 

 reflexed and moderately concave ; surface glabrous, very sparsely 

 punctate and setose, seta' moderate in length and somewhat erect; 

 external border straight or feebly sinuate; internal margin feebly 

 arcuate; apical margin subtruncate, angle narrowly rounded, both 

 fringed with rather long hairs, which are somewhat dense at the 

 angle; apex small and short, triangular, finely setose, with a tuft of 

 slightly longer hairs at tip. 



Appendage rather small and conical, equal in length to the apex, 

 finely setose, with a tuft of longer hairs at tip. 



Basal pronvhienee small and not very evident. 



Superior pndeiKhd membrane attaining the middle of the dorsal 

 plate; finely but not strongly longitudinally rugulose. 



Ventrolateral surfaces. — Body scarcely swollen in basal half, 

 broadly concave laterally before the apices; setose, seta? rather long, 

 espcK^ially upon tlie inferior margin of the fossa and at angle; surface 

 glabrous. Internal margins of the valves contiguous in basal fourth. 

 Genital fissure fusiform, widest in apical half, closed by the inferior 

 pudendal membrane in basal moiety. 



It is proper to recognize two forms, as follows: 



Forma typica. — Elongate, usually large and more or less shining. 

 Interstitial punctures finely muricate and moderately distant, the 

 punctures laterally and on the apex more decidedly prickly, each with 

 a very small stiff seta. Elytral apex graduallj^ narrowed and slightly 



