43. TANTILLA 881 
No. 32, 1887, p. 84; Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892, 
p- 598; Van Densurcu, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 1895, 
p. 140; Van Densurcu, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 1896, 
p- 1008; Corr, Report U. S. Nat. Mus. for 1898, 1900, p. 1113; 
Van DensurcH & Srevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 3, 
1913, p- 424; SrEJNEGER & Barzour, Check List N. Amer. Amph. 
Rept., 1917, p. 105 (part); Van DenspurcH & Stevin, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. XI, 1921, p. 52; Netson, Mem. Nat. Acad. 
Sci., Vol. XVI, 1921, pp. 114, 115; TERRon, Mem. y Rev. Soc. 
Cient. Antonio Alzate, Vol. 39, 1921, p. 164. 
Description —Head rounded in outline, very flat above 
and rather broad across temporal regions, but little distinct 
from neck. Eye small. Snout prolonged beyond the lower 
jaw. Rostral rather large and somewhat recurved on top 
of snout, bounded behind by internasal, anterior nasal, and 
first labial plates. Plates on top of head are a pair of small 
internasals, a pair of prefrontals, a frontal, the supraocular 
of each side, and a pair of parietals. Posterior nasal united 
with anterior above nostril, usually in contact with preocular. 
No loreal. One preocular. Two or rarely one, postoculars. 
Temporals elongate, 1+1. Supralabials seven, the last 
largest, the third and fourth reaching eye. Infralabials six, 
or seven, the first pair in contact on the midline. Scales 
smooth, in 15 rows. Anal divided. Gastrosteges varying in 
number from 138 to 141. Urosteges in two series of from 
49 to 6l. 
The top of the head, the temporal regions, and the first 
five transverse rows of scales on the neck are brown, chang- 
ing gradually from hair brown on the snout to deep clove 
brown posteriorly. On the sixth and seventh rows of scales 
of the neck is a transverse whitish collar about as wide as 
the length of one scale. The rest of the upper surface is 
light broccoli brown, slightly vinaceous on the tail. The 
posterior three-fourths of the ventral surface are coral red, 
