666 13. COLUBRIDX 



Zamenis lateral! s fuliginosus COPE, Amer. Naturalist, Vol. XXIX, 1895, 

 p. 679 (type locality, Santa Margarita Island, Lower Calif- 

 ornia, Mexico); COPE, 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 DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. 

 6, 1896, p. 347; RUTHVEN, Bull. Amer. Mus. Nat. Hist., Vol. XXIII, 

 1907, p. 574; VAN DENBURGH & SLEVIN, Proc. Cal. Acad. Sci., 

 Ser. 4, Vol. 3, 1913, p. 416. 



Zamenis flagellum MOCO.UARD, Nouv. Arch. Mus. Hist. Nat., Paris, Ser. 

 4, Vol. I, 1899, p. 323. 



Zamenis flagellum flagellum COPE, 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., 1901, 

 p. 60. 



Bascanium flagellum MEEK, Field Columbian Mus., Zool. Ser., Vol. VII, 

 No. i, 1906, p. 15. 



Zamenis flagclliformis frenatus DITMARS, Reptile Book, 1907, p. 288. 



Zamenis flagelliformii piceus DITMARS, Reptile Book, 1907, p. 288. 



Bascanion flagellum STONE, Proc. Acad. Nat. Sci. Phila., 1911, p. 231. 



Bascanion lateralc Juliginosum VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. 4, 1914, pp. 133, 145. 



Zamenis flagelliformus frenatus RUTHLING, Copeia, No. 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. Amer. 

 Amph. Rept., 1917, p. 79; VAN DENBURGH & SLEVIN, 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 



