. The reptiles of western North America, an account of the species known to inhabit California and Oregon, Washington, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora and Lower California. Amer. Fauna, No. 35, 1905, p. 49;DiTMARs, The World Today, Oct. 1896, p. 1049; Ditmars, ReptileBook, 1907, p. 4S2, pis. CXXIX, fig. 1, CXXX, fig. I, CXXXII;RuTHVEN, Bull. Amer. Mus. Nat. Hist., Vol. XXIII, 1907, p. 591;Strecker, Proc. Biol. Soc. Washington, Vol. XXI, 1908, p. 78;Ellis & Henderson, Univ. Colorado Studies, Vol. X, No. 1, 1913,p. 108; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4,


. The reptiles of western North America, an account of the species known to inhabit California and Oregon, Washington, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora and Lower California. Amer. Fauna, No. 35, 1905, p. 49;DiTMARs, The World Today, Oct. 1896, p. 1049; Ditmars, ReptileBook, 1907, p. 4S2, pis. CXXIX, fig. 1, CXXX, fig. I, CXXXII;RuTHVEN, Bull. Amer. Mus. Nat. Hist., Vol. XXIII, 1907, p. 591;Strecker, Proc. Biol. Soc. Washington, Vol. XXI, 1908, p. 78;Ellis & Henderson, Univ. Colorado Studies, Vol. X, No. 1, 1913,p. 108; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4,Vol. 3, X913, p. 426; Strecker, Baylor Bulletin, Vol. XVIII, , 1915, p. 44; Grinnell & Camp, Univ. Cal. Publ. Zool., , No. 10, 1917, p. 196; VoRHiES, Univ. Ariz. Agric. Exper. StationBull. No. 83, 1917, p. 359; Stejneger & Barbour, Check ListN. Amer. Amph. Rept., 1917, p. 108; Cowles, Journ. Zool., Pomona College, Vol. XII, No. 3, 1920, p. 66. Crotalus adamanteus atrox Jan, Rev. Mag. Zoo!., 1859, p. 153; Jan,Elenco Sist. degli Ofidi, 1863, p. 123; Cope, Bull. U. S. Nat. Mus., Oc. PaPI R-, AtAI). Scl., \ X I \ \\ I)l Mil I Plate 107. 3 ;3 48. CROTALUS 915 No. I, 1875, p. 33; Cope, Bull. U. S. Nat. Mus., No. 17, 1880, ; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, pp. 12, 75; Gar-man, Mem. Mus. Compr. Zool. Cambr., Vol. VIII, No. 3, 1883,pp. iij, 172; Cope, Proc. Am. Philos. Soc, 1885, p. 287; Cope,Bull. U. S. Nat. Mus., No. 32, 1887, p. 90; Cope, Proc. U. S. , Vol. XI, 1888, p. 398; Cope, Proc. U. S. Nat. Mus., , 1889, p. 147; Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892,p. 690; Cope, Proc. Acad. Nat. Sci. Phila., 1892, p. 366; Cope,Amer. Naturalist, Vol. XXX, 1896, p. 1013; Cope, Report U. Mus. for 1898, 1900, p. 1164, fig. 334 (part); & Rehn,Proc. Acad. Nat. Sci. Phila., 1903, p. 33. Caudisona atrox Cope, in Mitchells Research. Venom Rattlesn., 1861,p. 121; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 309. Cau


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