400 BULLETIN 63^ UNITED STATES NATIONAL MUSEUM. 



Genital charaeters, male. — Edeauophore elongate, oblonsf-sub- 

 fusiform, scarcely arched. 



Basale oblong, moderately convex with the sides feebly arcuate. 



ApicaJe snbeqiiilaterally triangular, moderately depressed, broadly 

 impressed and membranous at middle; sides feebly arcuate and con- 

 verging to apex, the latter not in the least attenuate and narrowly 

 rounded: base subobtuselv lobed at middle and feebly sinuate later- 

 ally. 



Sternite rather short and slightly transverse, somewhat parabolic 

 in outline. Each lobe short and triangular; external border straight 

 or feebly sinuate in basal two-thirds, thence to apex feebly arcuate to 

 subtruncate, apex obtuse ; internal border oblique and feebly sinuate ; 

 surface very feebly convex, coarsely and sparsely punctate in apical 

 two-thirds, at apex rather densely so, sparsely setose, settp longer and 

 denser on apex. Membrane not setose across the bottom of the sinus, 

 the latter triangular and rather broad. 



Female. — Genital segment triangular, dorsal surface (juite i)lane 

 and feebly setose. 



Valvvla (Plate 5, fig. 12). — Dorsal plate elongate oblong; surface 

 plane or feebly concave, smooth and shining, with Aery few short 

 setse scattered over the apical half; external border nearly straight, 

 slightly converging apically and more or less explanate; apical mar- 

 gin more or less defined from the apex and rounded with the angle; 

 internal border quite straight or feebly sinuous. Apex membrano- 

 chitinous, feebly everted, slightly prolonged, tip rounded, convex 

 above and feebly concave beneath, with two or three long set?? near 

 tip, valvular membrane within finely setose; fossa at base of the 

 external surface. 



Basal promuumees not evident. 

 • Appendage short manmiilliform. smooth, with a tuft of some three 

 or four quite long setse. 



S((perior pudendal memhra/te longitudinally I'ugulose, attaining 

 the apical sixth of the dorsal plate. 



Ventrolateral surfaces. — Body triangular, ventral surface lines 

 straight when viewed longitudinally, laterally very feebly convex 

 in basal moiety, thence very slightly concave to apex; surface smooth 

 and impunctate. Surface of apex finely setose, submarginal groove 

 broad and shalloAv beneath the explanate external border of the dorsal 

 plate. Internal margins of the valves contiguous in basal four-fifths, 

 fissure in apical fifth and closed. Valves anteriorly produced in 

 median line beneath. 



Habitat. — Arizona (Fort Grant, July, Santa Rita Mountains, 

 Chiricaliua Mountains, Oracle, TTubbard and Schwarz; Williams. 

 Barber and Schwarz, all in the U. S. National Museum collection. 



