158 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Female. — Rather robust. Antenna' with about one or two joints 

 reaching beyond the prothoracic base. Elytra arcuately and verti- 

 cally declivons posteriorly. Abdomen horizontal, strongly convex 

 from side to side. Anterior femora obtuselv angnlate or simply sin- 

 uate; anterior tarsi without pubescence beneath. 



Measiire^nents. — Males: Length, 14..'")-lT.(j mm.; width, 5.6-6.8 mm. 

 Females: Length, 16-16.5 mm.: width. 6.5-7.0 mm. 



Genital charaeters^ male. — Edeagophore flattened oblong-ovate, and 

 slightly arched. 



Basale moderately long, oblong, quite evenly convex above, with 

 sides nearly parallel to feebly arcuate. 



Apicale triangular, slightly elongate and feebly decurved : surface 

 evenly and moderately convex, with a moderately wide membrano- 

 chitinous depression at middle third: sides feebly arcuate near the 

 base, thence to the tip slightly sinuate: apex somewhat produced and 

 subacute: base broadly lobed at middle and slightly sinuate laterally. 



jSfej-tiife transverse and setose. Each lobe rather broadly triangular, 

 with the external border (juite evenly and broadly arcuate: internal 

 border more or less arcuate: apex subacute to narrowly rounded: sur- 

 face quite evenly convex, rather evenly and not densely punctate in 

 apical three-fourths, seta^ moderately long. Sinus narrow^ and the 

 membrane not setose. 



Female. — Genital segment quadrato-parabolic in outline, quite 

 sbrongly convex antero-posteriorly so that the apical moiety appears 

 quite strongly and arcuately declivous apically, setose. 



Valvula (Plate 4, fig. 22). — Dorsal plate obovate, quite strongly 

 arcuate antero-posteriorly, broad in apical half and narrowing to 

 base, inner third of the apical half quite strongh^ reflexed; surface 

 somcAvhat shining, rather densely punctate and setose, seta^ rather 

 long and flying, somewhat dense: external l)ordernu)re or less straight 

 in basal half, thence broadly arcuate with the apical margin: internal 

 border arcuate in apical half, thence outwardly oblique to base and 

 more or less arcuate or straight. Apex rather small, subacute at 

 tip and more or less finely setose. 



Appendage short mauuuilliform with few very fine and rather long 

 seta? about tip. 



Superior pudendal memhrane quite broadly and triangularly ex- 

 posed and obsoletely longitudinally rugulose. 



Ventral ate r(d surfaces (|uite evenly convex, the submarginal groove 

 broad and shallow, curviug inward beneath the fossa to the base of 

 the apex, the exterual and apical borders of the dorsal plate apjjeai"- 

 ing quite strongly explanate: surface ])unctate and setose, seta' quite 

 long and flying. Interual bordei- of the vahes contiguous in basal 

 fourth, the genital fissure fusiform and situated at uiiddle two- 

 fourths, apparently closed by the inferior pudendal membrane. 



