43. TANTILLA 881 



No. 32, 1887, p. 84; COPE, Proc. U. S. Nat. Mus., Vol. XIV, 1892, 

 p. 598; VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 1895, 

 p. 140; VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 1896, 

 p. 1008; COPE, Report U. S. Nat. Mus. for 1898, 1900, p. 1113; 

 VAN DENBURGH & SLEVIN, Proc. Cal. Acad. Sci., Ser. 4, Vol. 3, 

 1913, p. 424; STEJNEGER & HARBOUR, Check List N. Amer. Amph. 

 Kept., 1917, p. 105 (part); VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. XI, 1921, p. 52; NELSON, 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 1 5 rows. Anal divided. Gastrosteges varying in 

 number from 138 to 141. Urosteges in two series of from 

 49 to 61. 



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, 



