NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 615 



tinctly fused with costa and sacculus, comprising somewhat less than 

 apical half of harpe, approximate apical two-thirds cm-ving consider- 

 ably ventrad, rather weakly constricted near base, approximate apical 

 third markedly expanded ventrad, dorsal margin and apical third 

 sparsely punctate and setose; apex with broad and shallow emargi- 

 nation, with dorsal extremity nearly squared to rather nan'owly 

 rounded, ventral extremity broadly rounded. 



Transtilla with arm short, slender, glabrous, basal portion divergent 

 from and apical portion parallel with dorsal margin of costa, apex 

 acute, failing to reach basal extremity of harpe by approximately its 

 own length. 



Uncus simple. Dorsal aspect: base small, sparsely setose near 

 lateral margins to entirely glabrous, completely and distinctly set off 

 from tegumen by areas of reduced sclerotization, cephalic margin 

 broadly and deeply emarginate mesad, lateral margins sinuate and 

 converging distad into base of uncal process; uncal process elongate, 

 slender, tubular, with lateral margins heavily sclerotized and sparsely 

 setose, basal third cm-ving somewhat ventrad, apical two-thirds linear, 

 apex acute. 



Gnathos fused into flattened flap directed ventrocaudad, elongate, 

 of medium width, lateral margins heavily sclerotized and glabrous, 

 mesal area weakly sclerotized and minutely pitted toward apex, apex 

 broadly rounded. 



Anellus large, membranous, unarmed, juxta absent. 

 I Aedeagus elongate, slender, asymmetrical, cylindrical, glabrous, 

 linear in dorsal and ventral aspects, approximate apical fourth cm-ving 

 considerably ventrad in lateral aspect, base irregularly expanded, 

 apex weakly expanded and irregularly opening. 



Vesica rather small, bulbous, membranous, armed at apex with 

 prominent cornutus directed distad. Cornutus with basal portion 

 large, moderately sclerotized, tapering distad; apical portion heavily 

 sclerotized, tapering to acute apex. 



Type. — Type & (type no. 61452) in the U.S. National Museum. 

 I Type locality. — Pyramid Lake, Nev. 



Distribution. — Western United States. Nevada, Cahfornia, and 

 Arizona southward into Mexico. 



Sources of material. — American Museum of Natural History 

 (5cf cf); California Academy of Sciences (2c?'cf); Cornell University 

 . (23 &&). 

 I Specimens examined. — 30 (all cTcf), from 6 localities: 



Arizona: San Carlos, 21 cf cf (May 12-13, 1918, J. Ch. Bradley). Cali- 

 fornia: Palm Springs, Riverside Co., c?" (April 2G, 1944, Fred H. Rindge collec- 

 tion); Rancho La Sierra, Riverside Co., 3 cT c? (May 17 and 21, 1941, Fred H. 

 Rindge collection), cf (May 16. 1947, Rindge collection); Victorville, 2 d' cf 

 (April 30, 1918, J. Ch. Bradley) ; White Mountains, Inyo Co., cf (Silver Canyon, 

 L 676-573—^4 9 



