390 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



(.'xternal border feebly arcuate: apical border briefly truncate and 

 internally angulate with the internal border, which is briefly and 

 obliquely truncate, thence more or less sinuous to base. Apex short 

 and somewhat deflexed. narrowly rounded at tip, finely setose, with 

 few longer hairs. 



Superior longitudinal memhrane longitudinally rugulose, reaching 

 about to the apex of the dorsal plate. 



Basal prominences scarcely evident. 



Ventrolatei^al surfaces. — Body triangular, flattened, surface lines 

 straight when viewed longitudinally and convex laterally; surface 

 glabrous, rather coarsely and sparsely punctate. Submarginal groove 

 strongly developed beneath the explanate external border of the 

 dorsal plate, narrow at base, thence widening broadly, so as to in- 

 volve the whole side before the fossa, at which it terminates. Ap- 

 pendage showing distinctly beneath the apical border of the dorsal 

 plate, apex finely setose. ^largin of the valves contiguous in basal 

 four-fifths, fissure in apical fifth and narrow. Inferioi- membrane 

 not visible. 



Hahitat. — Nevada (Verdi, Blaisdell) ; California (Bodie, eleva- 

 tion, 8,475 feet, July 1-7, Wickham). 



Number of specimens studied, 2. 



Sexitypes: Male in Wickham's, female in my collection. 



Type-localities. — Verdi, Nevada, and Bodie, California. 



Diagnostic characters. — Caseyi, by its pubescence, will naturally 

 be associated with Tricheleodes, and by being Amphidora-like in 

 facies it will most likely be referred to hirsuta. In color and pubes- 

 cence it reminds one of StenotridtuK. 



It is aberrant, and, for the present at least, will have to remain as 

 representative of a group in the present subgenus, analogous in this 

 respect to tibialis. Unfortunately the types are all the examples I 

 have seen, and this fact accounts for the obscurity of the relationships. 



The grooved apicale of the edeagophore in the male and the pubes- 

 cence in both sexes indicates an ajiparent aiijiroach at least toward 

 Tricheleodes; on the other hand, the dorsal [)late is more like that 

 observed in Bla[)ylis; the pudendal membrane is also unusiuilly long. 

 A larger series must be studied before any definite conclusion can be 

 arrived at. The two first joints of the })rotai'si lunc pubescent tufts 

 such as are observed in Blapvlis, but not in TricJuleodes. 



General ohser rations.- — The mentum is rather small and subtri- 

 angulo-trapezoidal in outline; the surface is moi'e or less foveate lat- 

 erally and densely j^unctured. 



In both ty]>es the piosternuui is but feebly prominent vent rally 

 with the coxa?, slightly con\ex autero-i)osteri()rly betweeu the coxiie, 

 and wnth a subacute, small but distiuct nnicro behind, dorsad to which 

 the posterior edge is vertically truncate. 



