13. COLUBR/D.¥ 



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 1 60. 

 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'. — Nuchal light collar involving the parietal plates; 

 gastrosteges 1+8 to 157. 



T. wilcoxi.— p. 882. 



200. Tantilla eiseni Stejneger 



California Tantilla 



Plate 97 



Tantilla ttigiiceps Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 85 

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



Tanti/la eiseni Stejneger, Proc. U. S. Nat. Mus., Vol. XVIII, 1896, 

 p. 117 (type locality, Fresno, California); Van Denburch, 

 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 Denburgh & 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. 



