134 STEJNEGER AND BARBOUR, 1933 



Crotalus conjluentus confluentus Cope 

 Ann. Rep. U. S. Nat. Mus., 1898 (1900), p. 1170, figs. 336-338. 



TYPE locality: "Valley of the Arkansa" near Bell's Springs, 



Colorado. 

 range: The Great Plains, from about the 96th Meridian to the 



Rocky Mountains and from southern Canada to Texas. 



Crotalus confluentus abyssus Klauber 

 Crotalus confluentus abyssus Klauber 



Trans. San Diego Soc. Nat. Hist., Vol. 6, No. 3, Feb. 28, 1930, p. 114, 

 pi. 11, fig. 1. 



TYPE locality: Tanner Trail 300 ft. below south rim of Grand 



Canyon, Coconino County, Arizona. 

 range: Grand Canyon of the Colorado River, Arizona. 



Crotalus confluentus concolor (Woodbury) 



YELLOW RATTLESNAKE 



Crotalus concolor Woodbury 



Bull. Univ. Utah, Vol. 20, No. 6, Dec. 1, 1929 [p. 3], figs. 1-2. 

 Crotalus confluentus decolor Klauber 



Trans. San Diego Soc. Nat. Hist., Vol. 6, No. 3, 1930, p. 111. 



type locality: King's Ranch, Garfield Co.^ near base of Henry 



Mountains, Utah. 

 range: The Henry Mountains region, Wayne and Garfield 



Counties, Utah. 



Crotalus confluentus lutosus Klauber ^ 

 Crotalus confluentus lutosus Klauber 



Trans. San Diego Soc. Nat. Hist., Vol. 6, No. 3, 1930, p. 100, pi. 10, 



fig. 1. 

 TYPE locality: 10 miles northwest of Abraham on the road to 



Joy, Millard County, Utah. 

 range: Plateau region from the Rockies to the Sierras, including 



Utah west of the 111th Meridian, northern and central Nevada, 



northern California east of the Sierras, southeastern Oregon 



and southern Idaho. 



Crotalus confluentus oreganus (Holbrook) 



Crotalus oreganus Holbrook 



N. Amer. Herp., Ed. l,Vol. 4, 1840, p. 115, pi. 29 [= 24]. 

 Crotalus confluentus oreganus Klauber 



' Dr. Amaral described this race as Crotalus confluentus kellyi (Bull. Antivenin Inst., Vol. 2, No. 4, 

 Feb. 1929, p. 91), but unfortunately his type specimen proves not to belong to this form. 



