144 MTLLETTN 03, UNITED STATES NATIONAL MUSEUM. 



Basale oblong, rather clee])ly impressed along the middle in apical 

 half; sides feebly and evelily arcuate. 



Apicale rather elongately triangular; dorsal surface evenly and not 

 strongly convex. Aaguely and narrowly impressed at the middle; 

 sides very feebly sinuate; apex gradually produced and acute; base 

 broadly lobed at middle and feebly sinuate laterally. 



Stemite slightly transversely oblong. Each lobe rather narrow 

 and somewhat long; external border quite straight in basal half, 

 thence evenly arcuate to the apex, the latter rounded : internal border 

 sinuate and more or less membranous; surface feebly convex, shining, 

 sparsely punctate and setose, setse rather long and dense at apex. 

 Sinus rather broad, membrane not setose. 



Female. — Genital segment subequilaterally triangular, with the 

 dorsal surface strongly concave, well chitinized and setose, seta^ short, 

 subequal, and sparsely distributed over the apex, appendage, and 

 apical moiety of the dorsal plate. 



Valvula (Plate 4, fig. 14) reflexed externally. Dorsal plate ob- 

 long-oval; surface evenly concave, glabrous, finely and sparsely 

 punctate; external border not well defined from the lateral surface 

 towards base, arcuate apically; internal border arcuate and slightly 

 reflexed in apical half; apical border continuously arcuate with the 

 external and not defined from the apex, angle and external lobe not 

 evident; apex short and triangular. 



Appendar/e short and mannnilliform, fully visible from above, 

 directed upwards and backwards; fossa not well defined. 



Superior pudendal mcnihrane reaching to the middle of the dorsal 

 plate, finely and longitudinally rugulose. 



Basal promrnenres feeble. 



Yentrolatertd surfaces smooth and glabrous, very sparsely, evenly 

 punctate and setose, setse short; surface somcAvhat semicircularly 

 convex from side to side, narrowly and rather deeply impressed later- 

 ally before the inferior border of the fossa ; internal margins of the 

 valves contiguous in basal third. (lenital fissure fusifoi-m oval, with 

 the inferior j)uden(lal meml^rane more or less visible in the basal 

 moiety. Submarginal groove fine, not very distinct beneath the 

 apical half of the external border of the dorsal plate. 



Habitat. — Forma typica. — Calif oi-nia (Lassen County, Charles 

 Fuchs; Owens Valley, Dr. George Horn; Bodie, elevation 8,475 feet, 

 in July, and at Amedee, elevation 4,l200 feet, II. F. Wickham) ; Ne- 

 vada (western, by Mr. (labb; Carson, Reno, in July, Humboldt Lake 

 in June, II. F. Wickham) : Oregon (U. S. National Museum Collec- 

 tion, C. V. Eiley) ; New Mexico (Coolidge, U. S. National Museum 

 collection, M. L. Linell). 



If Ijinell's record is correct, pilosa may be looked for in northern 

 Arizona, Utah, and southwestern Colorado. 



