. 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. 15, 1915. Coluber flagellum frenatus Grinnell & Camp, Univ. Cal. Publ. Zool.,Vol. 17, No. 10, 1917, p. 190; Cowles, Journ. Entomol. & Zool.,Pomona College, Vol. XII, No. 3, 1920, pp. 65, 66; Stephens,Trans. San Diego Soc. Nat. Hist., Vol. Ill, No. 4, 1921, p. 64. Coluber flagellum piceus Stejneger & Barbour, Check List N. Rept., 1917, p. 79; Van Denburgh & Slevin, Proc. Sci., Ser.
. 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. 15, 1915. Coluber flagellum frenatus Grinnell & Camp, Univ. Cal. Publ. Zool.,Vol. 17, No. 10, 1917, p. 190; Cowles, Journ. Entomol. & Zool.,Pomona College, Vol. XII, No. 3, 1920, pp. 65, 66; Stephens,Trans. San Diego Soc. Nat. Hist., Vol. Ill, No. 4, 1921, p. 64. Coluber flagellum piceus Stejneger & Barbour, Check List N. Rept., 1917, p. 79; Van Denburgh & Slevin, Proc. Sci., Ser. 4, Vol. XI, 1921, pp. 28, 36, 52, 64. Descripion.—Head rather long, with flattened top, andnarrow rounded snout. Rostral plate large, high, hollowedbelow, and bounded behind by internasal, anterior nasal, andfirst labial plates. Plates on top of head are a pair of inter-nasals, a pair of prefrontals, supraocular and part of upperpreocular of each side, a long frontal, and a pair of largeparietals. Anterior and posterior nasals distinct. Lorealwell developed. Preoculars normally two, but sometimes Oc. Paim Rs Acad. Sci., \( X I \ A\ 1^1 N K(.H I 64.
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