166 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Genital eharactert<, male. — Edeagophore oblong-oval, rather pro- 

 longed and acute at apex, not arched. 



Basale oblong, evenly and moderately convex, sides nearly parallel 

 and very feebly arcuate. 



Apicale triangular, moderately elongate, more or less arcuately 

 decurved at tip; surface evenly and not strongly convex, with a 

 median linear groove at middle three-fifths, which is slightly dilated 

 in basal third and more or less membranous; sides moderately arcuate 

 in basal third and thence broadly and evenly sinuate to apex, the 

 latter produced and acute; base subacutely lobed at middle, broadly 

 and more or less sinuate laterally. 



Sternite subtriangularly parabolic in outline. Each lobe triangular 

 with the external border more or less straight in basal half, thence 

 evenly arcuate to apex, the latter moderately rounded ; internal border 

 only defined near apex, thence to base membranous; surface more or 

 less convex, bright and shining and sparsely punctate in the externo- 

 basal half, with the interno-apical moiety sloping inwards toward 

 the sinus and membrano-chitinous, densely punctate and setose, seta? 

 quite long. Sinus narrow and nearly closed by membrane, the latter 

 more or less setose. 



Female. — Genital segment subquadrate, apical half more or less 

 deflexed and conspicuously setose. 



Vahn/la (Plate 4, fig. 5). — Dorsal plate obovate, with the internal 

 fourth of the apical half reflexed, smooth and glabrous;, outwardly 

 plane or feeble convex, surface shining and sparsely punctate, each 

 puncture with a long seta ; external border straight to feebly arcuate ; 

 apical border more or less arcuate to subtruncate and moderately 

 rounded at the angle; internal border arcuate in apical two-thirds, 

 thence outwardly oblique and more or less sinuate to base; apex 

 moderately short, acute and finely setose. 



Appendage flattened, semi-oval, scarcely twice as wide as long, 

 sparsely clothed with rather short setii?. Fossa large and fringed 

 with quite long seta\ longest externally. 



Superior pudendal membrane reaching to about the middle of the 

 dorsal plate, reflected apically and continuous with the valvular mem- 

 brane without fornix, and thereby shortest in the median line. 



Ventrolateral surfaces very moderately convex; surface lines 

 straight as viewed longitudinally, rather densely clothed with quite 

 long setae; submarginal groove broad and oblique beneath the ex- 

 planate external and apical borders of the dorsal plate, terminating 

 at the internal margin of the fossa. Valves contiguous in basal third, 

 the genital fissure rather broadly fusiform, and closed in the basal 

 half by the inferior pudendal membrane. 



