28. COLUBER 661 
Bascanium constrictor Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1891 
(1892), p. 624 (part). 
Zamenis constrictor BOULENGER, Cat. Snakes Brit. Mus., Vol. I, 1893, 
p- 387 (part); Corr, Report U. S. Nat. Mus., 1898, 1900, p. 791 
(part). 
Zamenis constrictor flaviventris Dirmars, Reptile Book, 1907, p. 285 
pl. LXXXIX, fig. 2; Ruruiine, Copeia, No. 15, 1915. 
Coluber constrictor vetustus GRINNELL & Camp, Univ. Cal. Publ. Zool., 
Vol. 17, No. 10, 1917, p. 189; Cowes, Journ. Entomol. & Zool., 
Pomona College, Vol. XII, No. 3, 1920, p. 66; SrepHENs, Trans. 
San Diego Soc. Nat. Hist., Vol. III, No. 4, 1921, p. 64. 
Coluber constrictor flaviventris STEJNEGER & Barsour, Check List N. 
Amer. Amph. Rept., 1917, p. 79 (part); BLANcHARD, Copeia, 1921, 
No. go, p. 6. 
’ 
Coluber constrictor mormon Van DeENBuRGH & SLeEvin, Proc. Cal. Acad. 
Sci., Vol. XI, 1921, pp. 28, 36, 40, 44. 
Description.—Head rather long, with flattened top and 
and rounded snout. Rostral plate large, about as high as 
wide, hollowed below, and bounded behind by internasal, 
anterior nasal, and first labial plates. Plates on top of head, 
a pair of internasals, a pair of prefrontals, supraocular and 
part of upper preocular of each side, long frontal, and a 
pair of large parietals. Anterior and posterior nasals dis- 
tinct. Loreal well-developed. Preoculars normally two, 
but sometimes united. Postoculars two, upper a little larger 
than lower. Temporals normally two followed by two, 
but may be 2+3, 1+2, 2+1, or 1+1. Seven or eight su- 
perior and eight, nine, or seven inferior labials, next to last 
of upper and fifth (or fourth) of lower largest, third and 
fourth or fourth and fifth superior reaching eye, first pair 
of inferior meeting on median line. Genials in two pairs, 
equal or either pair a little larger. Scales on body smooth, 
in 17 rows. Anal plate divided. Gastrosteges varying in 
number from 162 to 181. Urosteges in two series of from 
AIvtoi 102: 
The color above in adults is green, olive, or yellowish 
