CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 475 



United States: Arizona: Same data as types, 3 males, 8 females (MCZ, RCF) ; 

 same locality as types. Mar. 7, "2 males labeled Pangaeus bilinealus Uhl. det. 

 O. H.[eidemann]" (USNM). Dry Canyon Sands Ranch, southeast end of 

 Whetstone Mts., Cochise Co., Aug. 10, 1952, H. B. Leech and J. W. Green, 1 

 male (CalAc). Mt. Lemon Road, 6,000 feet, Santa Catalina Mts., Dec. 27, 1937, 

 E. C. Van Dyke, 2 males, 1 female (CalAc). Benson, June 7, 1930, G. Linsley, 

 1 male (CalAc). Santa Rita Mts., 5,000 to 8,000 feet, July, F. H. Snow, 1 male 

 (KU). Catalina Springs, Apr. 27, 1 female (USNM). Baboquivari Mts., 

 July 24, 1941, R. H. Beamer, 1 female (KU); Nov. 8, 1936, E. D. Ball, 1 female 

 (USNM). Paradise, July 22, 1914, 1 male (USNM). Douglas, W. W. Jones, 



1 female (USNM). Texas: Presidio Co., July 16, 1927, R. H. Beamer, 2 males, 



2 females (KU). El Paso, July 18, 1932, 1 male (RLU). Chisos Mts., Brewster 

 Co., July 16, 1921, C. D. Duncan, 1 female (CalAc). Big Bend Park, Chisos 

 Mts., July 5, 1942, H. A. Scullen, 1 male (USNM). Marathon, C. M. Hamilton, 

 1 male (USNM). Davis Mts., June 26, 1946, E. C. VanDyke, 1 female (CalAc). 

 Valentine, July 13, 1927, P. A. Readio, 2 females (KU). Guadalupe Pass, 

 Hudspeth Co., July 28, 1950, R. F. Smith, 1 female (AmM). Basin, Big Bend 

 National Park, Brewster Co., July 14, 1950, R. F. Smith, 1 female (AmM). 



Mexico: Chihuahua: Canon de Prieto, near Primavera, July 2, 1947, 6,500 

 to 6,800 feet, D. Rockefeller Exp., Michener. San Luis Potosi: El Salto, June 19, 

 1953, Univ. Kansas Mexican Expedition, 1 male (KU). 



Discussion. — This species and the next comprise a pair of forms 

 well-separated from the other species of the subgenus by several 

 characters: (1) the coarse crenulations on the posterior margin of the 

 mesopleuron; (2) the very deeply concave side margin of the meta- 

 pleural evaporatorium which permits the lateral area to reach almost 

 or quite to the apex of the peritreme; (3) the convex ventral surface 

 of the posterior femur with the numerous small tubercles on the distal 

 half; and (4) the peculiar shape of the hind tibia of the male (fig. 153), 

 the posteroventral margin of which shows a finely crenulate emargina- 

 tion basally and a strong angulation just beyond. The two forms are 

 very close and when more material from northern Mexico is studied 

 it may be found that they represent two forms of a single species. At 

 present, however, they appear separable on the basis of the key 

 character pertaining to the vestiture of the head and the generally 

 separate ranges. 



How these two, strongly marked species could remain so long 

 without being described is difficult to explain. This condition reflects 

 the uncertainty that has existed pertaining to the limits of speciec 

 within the group and leading to many misidentifications. 



Pangaeus {Homaloporus) tuberculipes, new species 



Plate figures 153, 154, 223 



Diagnosis. — The presence of numerous small tubercles on the 

 ventral face of the posterior femur (fig. 154) coupled with the lack of 

 a submarginal row of short stout submarginal pegs on the anterior 



