178 BULLETIN 187, UNITED STATES NATIONAL MUSEUM 



1909, pp. 935-936, pi. 27 (head in color; the plate appeared in livr. 8, 1882).— 

 DiTMAES, Snakes of the world, 1931, pi. 54 (lower fig.). 

 Aglcistrodon HUneattis Stejnexjee, North Amer. Fauna, No. 14, 1899, p. 71. — 

 Tayix)r, Univ. Kansas Sei. Bull., vol. 26, 1939 (1940), p. 486.— Gloyd and 

 CONANT, Bull. Chicago Acad. Sci., vol. 7, No. 2, 1943, p. 163, figs. 4, 11, 12, map 

 2. — Schmidt and Owens, Publ. Field Mus. Nat. Hist., zool. ser., vol. 29', 1944, 

 p. 113. 



Type. — Brit. Mus. Nat. Hist. 



Type locality. — Pacific coast of Guatemala. 



Range. — Coastal areas from central eastern Nuevo Leon southward 

 into Nicaragua, including the Yucatan Peninsula; from southern 

 Sonora southward on the Pacific coast into Guatemala ; Maria Madre 

 Island, Tres Marias Islands (known from various localities in the 

 states of Chiapas, Colima, Guerrero, Jalisco, Michoacan, Nayarit, 

 Nuevo Leon, Oaxaca, Sinaloa, Sonora, and Yucatan, as well as the 

 Tres Marias Islands). 



♦AGKISTRODON MOKESON PICTIGASTER Gloyd and Conant «> 



Agkistrodon mokeson pictigaster Gloyd and Conant, Bull. Chicago Acad. Sci., 

 vol. 7, No. 2, 1943, pp. 156-162, fig. 10, map. 1. 



Type. — Chicago Acad. Sci. No. 4857. 

 ' Type locality. — Maple Canyon, Chisos Mountains, 5,200 feet, 

 Brewster County, Tex. 



Range. — Trans-Pecos region of Texas, including southern Jeff Davis 

 County and the Chisos Mountains of Brewster County. 



♦AGKISTRODON PISCIVORUS LEUCOSTOMUS (Troost) !» 



Acontias leucosloma Tkoost, Ann. Lye. Nat. Hist. New York, vol. 3, 1836, p. 176, 



pi. 5, figs. 1-4. 

 Agkistrodon pUcivorus leucostonia Gloyd and Conant, Bull. Chicago Acad. Sci., 



vol. 7, No. 2, 1943, pp. 164-165, figs. 5, 13, 15, map 2. 



Type. — Not known. Neotype, Chicago Acad. Sci. No. 5604. 



Type locality. — Western Tennessee, restricted to 10 miles northeast 

 of Bolivar, Hardeman County, Tenn. 



Range. — "The valley of the Rio Grande . . . and the Gulf Coastal 

 Plain of Texas, Louisiana, and Mississippi, eastward at least to the 

 vicinity of Mobile, Alabama ; north in the Mississippi Valley through 

 western Tennessee to southern Illinois, and west as far as Miller 

 county, Missouri, and eastern Oklahoma." 



*" Known from the trans-Pecos region, including the Chisos Mountains, of Texas, and 

 therefore to be expected in adjacent regions of Coahuila. 



"1 Not definitely recorded from Mexico. It is to be expected since it is known from the 

 Rio Grande on the United States side. 



