876 13. COLUBRIDA 
rows. The anal plate is divided, and the urosteges are in 
two series. The eye is small, with round pupil. 
KrY 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'.—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 Densurcu, 
Occas. Papers Cal. Acad. Sci., V, 1897, p. 177; Brown, Proc. Acad. 
Nat. Sci. Phila., 1901, p. 93; Dirmars, Reptile Book, 1907, p. 3913 
Van DensurcH & Sievin, Proc. Cal. Acad. Sci., Ser. 4, Vol. III, 
1913, p. 424; RutHiinc, Copeia, No. 15, 1915; GRINNELL & Camp, 
Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 194; STEJNEGER 
& Barsour, Check List N. Amer. Rept., 1917, p. 105; STEPHENS, 
Copeia, No. 54, 1918, p. 34; STEPHENS, Trans. San Diego Soc. 
Nat. Hist., Vol. III, No. 4, 1921, p. 65; Van DenspurcH & SLEvin, 
Proc, Cal. Acad. Sci., Ser. 4, Vol. XU, 1921, p. $2: 
