608 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



curving gradually and evenly dorsad to apex, basal third narrow and 

 with margins subparallel, central portion evenly and broadly expanded 

 ventrad to about twice width of basal third, apical portion narrowing 

 considerably ventrad to apex; apex evenly and rather narrowly 

 rounded, directed dorsocaudad and also curving mesad. 



Transtilla with arm well sclerotized, glabrous, quite short, only 

 about one-sixth as long as harpe, terminating acutely far above base of 

 harpe, basal two-thirds diverging from costal margin of harpe, apical 

 third converging toward costal margin. 



Uncus bifid. Dorsal aspect: base separated from tegumen by 

 irregular and roughened area of reduced sclerotization, cephalic margin 

 deeply emarginate mesad, mesal area glabrous; lateral areas heavily 

 sclerotized, sparsely punctate and setose, gradually converging distad 

 and smoothly fusing into bases of furcae ; angle of bifurcation very narrow, 

 obscure; furcae approximate, superficially appearing as single process 

 (especially in dried or untreated specimens), rather elongate and 

 narrow, heavily sclerotized, directed caudad and slightly ventrad, 

 lateral margins sparsely punctate and setose, apices acute and slightly 

 divergent. 



Gnathos fused, rather elongate, directed caudad and slightly ven- 

 trad, mesal portion wealdy sclerotized, apical portion heavily scobinate; 

 lateral margins heavily sclerotized, gradually and evenly converging 

 to rounded and minutely emarginate apex. 



Anellus large, membranous, unarmed, juxta absent. 



Aedeagus very slender, elongate, approximately as long as harpe, 

 extending back into abdomen, cylindrical, asymmetrical, glabrous, 

 sublinear in dorsal and ventral aspects, approximate apical third to 

 fourth sinuate and curving ventrad in lateral aspect; base expanded 

 laterad and ventrad, emarginate ventrad, opening dorsad; apical 

 fifth opening broadly and consisting simply of well sclerotized, narrow, 

 dextral area terminating distad in short, acute, heavily sclerotized, 

 spinelike process directed caudad. 



Vesica membranous, apparently unarmed. 



Type. — Type cf in the British Museum (Natural History). 



Type locality.- — "Arizona." 



Distribution.- — Southwestern United States. Arizona. 



Sources of material.- — American Museum of Natural History 

 (1 cf , 1 9) ; California Academy of Sciences (2 cf cf ) ; University of 

 Kansas (1 cf ). 



Specimens examined.- — 5 (4 cf cf , 1 9), from 5 localities: 



Arizona: Baboquivari Mountains, cf (no date, F. H. Sno-w); Dome, cf 

 (July 21, 1924, E. P. Van Duzee); Maricopa Co., "10 miles north of Gila Bend," 

 cf (July 22, 1924, with mites on abdomen, E. P. Van Duzee); Superior, Pinal 

 Co., cf (Boyce Thompson Arboretum, Aug. 1, 1937, A. B. Klots); Tucson, 

 Pima Co., ? (July 30, 1937, A. B. Klots). 



