. 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. enburgh & Slevin, Proc. Sci., Ser. 4, Vol. 4, 1914, pp. 133, 145, 147; Camp, Univ. Zool., Vol. 12, No. 17, 1916, p. 533; Grinnell & Camp,Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 197; Vorhies,Univ. Ariz. Agric. Exper. Station Bull. No. 83, 1917, p. 359; Stej-neger & Barbour, Check List N. Amer. Amph. Rept., 1917,p. 110; CowLEs, Journ. Entomol. & Zool., Pomona College,
. 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. enburgh & Slevin, Proc. Sci., Ser. 4, Vol. 4, 1914, pp. 133, 145, 147; Camp, Univ. Zool., Vol. 12, No. 17, 1916, p. 533; Grinnell & Camp,Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 197; Vorhies,Univ. Ariz. Agric. Exper. Station Bull. No. 83, 1917, p. 359; Stej-neger & Barbour, Check List N. Amer. Amph. Rept., 1917,p. 110; CowLEs, Journ. Entomol. & Zool., Pomona College, , No. 3, 1920, p. 66; Stephens, Trans. San Diego Soc. , Vol. Ill, No. 4, 1921, p. 65; Van Denburgh & Slevin,Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 53, 72; Nelson,Mem. Nat. Acad. Sci., Vol. XVI, 1921, pp. 115, 159. Crotalus pyrrhus Cope, Bull. U. S. Nat. Mus., No. i, 1875, p. 3y, Cope,in Yarrow, Surv. W. looth Merid., Vol. V, 1875, P- 535. pl- XXII;Streets, Bull. U. S. Nat. Mus., No. 7, 1877, p. 39; Yarrow &Henshaw, Ann. Rep. Chief of Engineers for 1878, Surv. W. looth Oc. , Cal. Acai). Sci., \i) X [ \ AN i;l I , 11 +. *.«? 48. CROTALUS 951 Merid., Appendix NN, 1878, p. 210; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, pp. 12, 73; TowNSEND, Proc. U. S. Nat. Mus., Vol. XIII, 1890, p. 144; Stejneger, West Amer. Scientist, Vol. VII, 1891, p. 165; Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. confluentiis var. pyrrhiis Garman, Mem. Mus. Conipr. Zool., Cambr., Vol. VIII, No. 3, 1883, p. oregonus var. mitchelli Garman, Mem. Mus. Compr. Zool., Cambr., Vol. VIII, No. 3, 1883, p. 173; Garman, Bull. Essex Inst., Vol. XVI, No. I, 1884, p. Mitchellii pyrrhus Stejneger, Report U. S. Nat. Mus. for 1893, 1895, p. 456. Description.—Moderately large. Head rather small,with flattened top, varying in outline according to positionof fangs, etc. Rostral either higher than wide or widerthan high, separated fro
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