876 13. COLUBRID& 



rows. The anal plate is divided, and the urosteges are in 

 two series. The eye is small, with round pupil. 



KEY TO THE SPECIES OF TANTILLA 



a. Gastrosteges more than 165. 



T. eiseni. p. 876. 



a*. Gastrosteges fewer than 160. 

 b. Nuchal light collar crossing behind the parietal plates; 



gastrosteges 135 to 148. 



c. Nuchal collar one to three rows of scales behind the 

 parietal plates. 



T. nigriceps. p. 878. 



c. Nuchal collar on sixth and seventh rows of scales 

 behind the parietals. 



T. planiceps. p. 880. 



b 1 . Nuchal light collar involving the parietal plates ; 

 gastrosteges 148 to 157. 



T. wilcoxi. p. 882. 



200. Tantilla eiseni Stejneger 



CALIFORNIA TANTILLA 



Plate 97 



Tantilla nigriceps YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, p. 85 

 (part); COPE, Report U. S. Nat. Mus. for 1898, 1900, p. 1113 (part); 



Tantilla eiseni STEJNEGER, Proc. U. S. Nat. Mus., Vol. XVIII, 1896, 

 p. 117 (type locality, Fresno, California); VAN DENBURGH, 

 Occas. Papers Cal. Acad. Sci., V, 1897, p. 177; BROWN, Proc. Acad. 

 Nat. Sci. Phila., 1901, p. 93; DITMARS, Reptile Book, 1907, p. 391; 

 VAN DENBURCH & SLEVIN, Proc. Cal. Acad. Sci., Ser. 4, Vol. Ill, 

 1913, p. 424; RUTHLING, Copeia, No. 15, 1915; GRINNELL & CAMP, 

 Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 194; STEJNEGER 

 & BARBOUR, Check List N. Amer. Rept., 1917, p. 105; STEPHENS, 

 Copeia, No. 54, 1918, p. 34; STEPHENS, Trans. San Diego Soc. 

 Nat. Hist., Vol. Ill, No. 4, 1921, p. 65; VAN DENBURGH & SLEVIN, 

 Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, p. 52. 



