830 13. COLUBRID 
Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 180 (part); STEJNEGER 
& Barsour, Check List N. Amer. Amph. Rept., 1917, p. 102 (part); 
Biancuarb, Copeia, 1921, No. go, p. 6. 
Thamnophis elegans CocKERELL, Univ. Colorado Studies, Vol. VII, No. 
2, 1910, p. 131; Exzis & Henperson, Univ. Colorado Studies, 
Vol. X, No. 2, 1913, p. 88; Extis & Henperson, Univ. Colorado 
Bull., Vol. XV, No. 6, 1915, p. 261; Dice, Univ. Cal. Publs. Zool., 
Vol. 16, No. 17, 1916, pp. 303, 304, 310, 319, 321. 
Thamnophis ordinoides vagrans VAN DenBURGH & SLEviN, Proc. Cal. 
Acad. Sci., Ser. 4, Vol. VIII, No. 6, 1918, p. 240, pl. 10; Van Den- 
BURGH & Srevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 
29, 37, 40, 46, 52. 
Description—Head distinct from neck, flat-topped, 
with narrow rounded snout. Temporal regions sometimes 
swollen in old specimens. Eye moderate. Rostral plate 
large, bounded behind by internasal, anterior nasal, and first 
labial plates. Plates on top of head: A pair of internasals, 
a pair of prefrontals, a frontal, supraocular of each side, 
and a pair of parietals. Anterior and posterior nasals dis- 
tinct. One loreal. One preocular, rarely two or three. 
Postoculars normally three, rarely two or four. Temporals 
normally one followed by two, sometimes 1+3. Eight, 
or rarely seven, superior and eight to eleven, normally ten, 
inferior labials, usually the fifth, sixth or seventh superior, 
and fifth, sixth or seventh inferior largest, the fourth and 
fifth or third and fourth superior reaching eye, the first 
pair of inferior meeting on the median line. Two pairs of 
genials, the posterior equal to or shorter than anterior. 
Scales in 21 or very rarely 19 rows, all keeled except some- 
times, the first row on each side. Anal plate not divided. 
Gastrosteges varying in number from 148 to 182, males 
having 159 to 182, females from 148 to 177. Urosteges 
in two series of from 67 to 95, males having from 79 to 95, 
females from 67 to 83. 
