666 13. COLUBRIDZ 
Zamenis lateralis fuliginosus Core, Amer. Naturalist, Vol. XXIX, 1895, 
p- 679 (type locality, Santa Margarita Island, Lower Calif- 
ornia, Mexico); Core, Report U. S. Nat. Mus., for 1898, 1900, 
p- 809. 
Bascanion piceum Van DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 
1896, p. 1006; Van Densurcu, Proc. Cal. Acad. Sci., Ser. 2, Vol. 
6, 1896, p. 347; Rutuven, Bull. Amer. Mus. Nat. Hist., Vol. XXIII, 
1907, p- 574; Van DensBurcH & Stevin, Proc. Cal. Acad. Sci., 
Ser. 4, Vol. 3, 1913, p. 416. 
Zamenis flagellum Mocquarp, Nouv. Arch. Mus. Hist. Nat., Paris, Ser. 
4, Vol. I, 1899, p. 323. 
Zamenis flagellum flagellum Core, Report U. S. Nat. Mus., for 1898, 
1900, p. 799 (part); TeRron, Mem. y Rev. Soc. Cient., Antonio 
Alzate, Vol. 39, 1921, pp. 165, 170. 
Zamenis flagellum frenatus Brown, Proc. Acad. Nat. Sci. Phila., rgor, 
p- 60. 
Bascanium flagellum MEEK, Field Columbian Mus., Zool. Ser., Vol. VII, 
No. 1, 1906, p. I5. 
Zamenis flagelliformis frenatus Dirmars, Reptile Book, 1907, p. 288. 
Zamenis flagelliformis piceus Dirmars, Reptile Book, 1907, p. 288. 
Bascanion flagellum Stone, Proc. Acad. Nat. Sci. Phila., 1911, p. 231. 
Bascanion laterale fuliginosum Van DensBurcH & Stevin, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. 4, 1914, pp. 133, 145. 
Zamenis flagelliformus frenatus Rutuuinc, Copeia, No. 15, 1915. 
Coluber flagellum frenatus GRINNELL & Camp, Univ. Cal. Publ. Zool., 
Vol. 17, No. 10, 1917, p- 190; Cowxes, Journ. Entomol. & Zool., 
Pomona College, Vol. XII, No. 3, 1920, pp. 65, 66; STEPHENS, 
Trans. San Diego Soc. Nat. Hist., Vol. III, No. 4, 1921, p. 64. 
Coluber flagellum piceus STEJNEGER & Barsour, Check List N. Amer. 
Amph. Rept., 1917, p. 79; VAN DenBurcH & S tevin, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 28, 36, 52, 64. 
Description.—Head rather long, with flattened top, and 
narrow rounded snout. Rostral plate large, high, hollowed 
below, and bounded behind by internasal, anterior nasal, and 
first labial plates. Plates on top of head are a pair of inter- 
nasals, a pair of prefrontals, supraocular and part of upper 
preocular of each side, a long frontal, and a pair of large 
parietals. Anterior and posterior nasals distinct. Loreal 
well developed. Preoculars normally two, but sometimes 
