570 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



Anellus large, membranous but slightly thickened, glabrous, juxta 

 absent. 



Aedeagus rather short and stout, asymmetrical, glabrous, slightly 

 sinuate, base expanded circularly, basal two-fifths cylindrical; apical 

 three-fifths consisting simply of narrow, well sclerotized, sinistral 

 projection gently curving ventrad and narrowing to acute apex; base 

 of this projection marked by prominent, nodelike expansion of left 

 wall of aedeagus as seen in dorsal and ventral aspects. 



Vesica large, membranous, extending slightly beyond sinistral pro- 

 jection of aedeagus, dextral surface armed with single large cornutus. 

 Cornutus arising from mesal portion of vesica, extending caudad 

 almost to apex of vesica, elongate, slender, heavily sclerotized, base 

 slightly expanded, apex acute. 



Type. — Holotype d" and allotype 9 (type no. 61436) in the U.S. 

 National Museum. 



Paratypes (74 cfc^, 11 99). — American Museum of Natural 

 History (24 cf cf, 3 99); California Academy of Sciences (37 cfcf, 

 6 99); Cornell University (4 c^'cf, 2 99); U.S. National Museum 

 (3 cf cf); University of Arizona (Agr. Exp. Sta.) (2 cfcf); University 

 of Kansas (4 c^ &). 



Type locality. — Tucson, Pima Co., Ai-iz. (July 20, E. A. Schwarz). 



Distribution. — Southwestern United States. Arizona and (?) 

 New Mexico. 



Specimens examined. — 87 (75 cfcf, 12 99), from 8 localities: 



Arizona: " Babaquivera" Mts., Pima Co., cf (Aug., collector unknown); Babo- 

 quivari Mts., Pima Co., 2 cf cf (July 15-30, 1924, O. C. Poling); Badger, Santa 

 Cruz Co., 13 cTcf (July 31, 1924, E. P. Van Duzee and J. O. Martin); Douglas, 

 Cochise Co., 2 cf cf (Aug., F. H. Snow); Patagonia, Santa Cruz Co., 14 cf (f, 

 2 99 (Aug. 1-2, 1924, 2 d^ cT with mites on abdomen, E. P. Van Duzee) ; Santa 

 Catalina Mts., & (Sabino Canyon, Aug. 12, 1924, E. P. Van Duzee); Santa 

 Cruz Co., & (Aug. 4, 1927, R. H. Beamer) ; Tucson, cf, 9 (July 20, E.A. 

 Schwarz), cf" (July 22, 1917, coll. unknown), 9 cf d", 4 99 (St. Xavier Monument, 

 July 29, 1924, E. P. Van Duzee), & (July 25, 1925, at light, 2400 feet, R. B. 

 Streets), d^ (Aug. 1, 1925, at light, 2400 feet, A. A. Nichol), 8 d' d' (July 30, 

 1937, one specimen with mite on antenna, A. B. Klots), 3 d^d^, 2 99 (Oct. 

 8-10, 1939, Crandall), 16 d^d^, 3 99 (July 19 to Aug. 3, 1943, Coll. Fred H. 

 Rindge). New Mexico: Santa Cruz, Santa Fe Co., d" (Aug. 20, 1927, R. H. 

 Beamer) (this locality record may possibly be in error). 



Remarks. — The locality records show that this species has been 

 recorded almost exclusively from southern Arizona, where it is quite 

 abundant in the vicinity of Tucson and other parts of Pima County 

 and ranges southward into Mexico. It is one of the larger and more 

 robust acrolophids. A. klotsi has not been previously described, 

 probably because of its marked but superficial resemblance to po- 

 peanellus which also occurs in Tucson and other sections of Arizona. 



