196 University of California Publications in Zoology [Vou.17 
Rance—Throughout the state chiefly west and north of the Colo- 
rado and Mohave deserts. Extends to an altitude of 8600 feet on the 
central Sierra Nevada. Has been found on the southeast to Charlotte 
Creek, 8500 feet altitude, Fresno County (Mus. Vert. Zool.) ; to Walker 
Pass (Mus. Vert. Zool.) and Mohave (Meek, Field Columb. Mus., zool. 
ser., 7, 1905 [1906], p. 17), in Kern County; to Pine Flats, 5500 feet 
altitude, San Gabriel Mountains, Los Angeles County (Grinnell and 
Grinnell, Throop Inst. Bull., 35, 1907, p. 53); to Doble, 7000 feet 
altitude, San Bernardino Mountains, San Bernardino County (Grin- 
nell, Univ. Calif. Publ. Zool., 5, 1908, p. 53); to Banning, Tahquitz 
Valley, 8000 feet altitude, and Santa Rosa Peak, in Riverside County 
(Atsatt, Univ. Calif. Publ. Zool., 12, 1913, p. 45) ; and to summit of 
Coast Range, near Mexican boundary, in San Diego County (Cope, 
Ann. Rep. U.S. Nat. Mus., 1898 [1900], p. 1179). Also found on the 
Providence Mountains, eastern San Bernardino County (U. 8. Nat. 
Mus.), and on Santa Catalina Island (Yarrow, U. S. Nat. Mus. Bull., 
24, 1882, p. 76). Oceupies all life-zones from Lower Sonoran to 
Canadian. Inhabits almost all types of environment, though ap- 
parently commonest on chaparral slopes and in open country where 
eround-squirrel burrows abound. (See fig. 14.) 
Crotalus atrox Baird and Girard 
Texas Rattlesnake 
OrieginaL Descrietion.—Crotalus atrox Baird and Girard, Cat. 
N. A. Reptiles in Smiths. Inst., pt. 1, 1853, pp. 5-6. 
Type Locauiry.—Indianola or San Pedro, Texas. 
Synonyms.—Crotalus adamanteus atrox, part; Crotalus lecontet, 
part. 
Common Names.—Western Diamond Rattlesnake, part; Fierce 
Rattlesnake; Arizona Diamond Rattlesnake, part. 
Ranee.—Colorado Desert near Mexican boundary. Recorded from 
Fort Yuma (Yarrow, U.S. Nat. Mus. Bull., 24, 1882, pp. 12, 75) and 
Laguna Station, New River (Cope, Ann. Rep. U. 8. Nat. Mus., 1898 
[1900], p. 1167) ; both stations in Imperial County. Life-zone, Lower 
Sonoran. (See fig. 14.) 
Crotalus exsul Garman 
Red Rattlesnake 
OrigInaL Description —Crotalus exsul Garman, Mem. Mus. Comp. 
Zool., 8, no. 3, June, 1883, pp. 114-115, 174. [Dr. Thomas Barbour 
