878 13. COLUBRID 
the western slope of the Cuyamaca Mountains at an altitude 
of 2,800 feet and in the Upper Sonoran Zone. 
Remarks.—Tantilla eiseni has more gastrosteges than 
any other of our species of Tantilla. It differs from 7. 
planiceps and T. wilcoxi in the position of the white collar. 
FHlabits—Al|most nothing is known regarding the habits 
of this snake. One was found by Mr. Frank Stephens in 
the fireplace of his home at Witch Creek. He says it prob- 
ably had worked its way up along the brick foundation of 
the fireplace during the night. 
201. Tantilla nigriceps Kennicott 
SONORAN TANTILLA 
Tantilla nigriceps KeNNicott, Proc. Acad. Nat. Sci. Phila., 1860, p. 328 
(type locality, Fort Bliss, New Mexico, and Indianola to 
Nueces, Texas); Core, Bull. U. S. Nat. Mus., No. 1, 1875, p. 35; 
Yarrow, Bull. U. S. Nat. Mus. No. 24, 1883, p. 85 (part); Gar- 
MAN, Mem. Mus. Compr. Zool., Vol. VIII, No. 3, 1883, p. 88; 
Corr, Proc. U. 8. Nat. Mus., Vol. XIV, 1892, p. 598; CockeRELL, 
American Naturalist, Vol. XXX, April, 1896, p. 326; Mc Lain, 
Critical Notes, 1899, p. 11; Cope, Report U. S. Nat. Mus. for 
1898, 1900, p. 1113 (part); Brown, Proc. Acad. Nat. Sci. Phila., 
1901, p. 93; Brown, Proc. Acad. Nat. Sci. Phila., 1903, p. 5513 
Branson, Kansas Univ. Sci. Bull., Vol. II, No. 13, 1904, p. 414, 
fig. 33; Cracin, Trans, Kansas Acad. Sci., Vol. VII, reprint, 1906, 
p- 118; Drrmars, Reptile Book, 1907, p. 391; Evtis & HENDERSON, 
Univ. Colorado Studies, Vol. X, No. 2, 1913, p. 106, pl. VII, fig. 
34; Van Densurcu & Stevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 
3, 1913, p- 423; Exits & Henperson, Univ. Colorado Bull., 
Vol. XV, No. 6, 1915, p. 263. 
Scolecophis fumiceps Corr, Proc. Acad. Nat. Sci. Phila., 1860, p. 371. 
Homalocranion planiceps BouLenGeER, Cat. Snakes Brit. Mus., Vol. III, 
1896, p. 226 (part). 
Tantilla planiceps StEJNEGER & Barpour, Check List N. Amer. Amph. 
Rept., 1917, p. 105 (part). 
Description.—Head rounded in outline, very flat above, 
