698 13. COLUBRID 
Elaphe Firzincer in Wagler, Descr. Icon. Amphib., Pt. 3, 1833, text to 
plate 27 (type, E. parreysii=quatuorlineata); STEJNEGER, Bull. 
U.S. Nat. Mus., No. 58, 1907, p. 307. 
Scotophis Barrp & Girarp, Cat. N. Amer. Rept., Pt. I, Serpents, 1853, 
p- 73 (type, Coluber alleghaniensis). 
The body is rather long and moderately slender, sub- 
cylindric, with tail elongate and tapering. The head is 
distinct from the neck, large, long, with flattened top and 
rounded snout. Its plates are normal. The nasal plates 
are not united. Usually one or two preoculars, two post- 
oculars, and a loreal. Scales on body keeled or smooth, 
usually with two apical pits. The anal plate is divided. 
Urosteges are in two series. The eye is moderately large, 
with round pupil. Maxillary teeth about equal in size. 
A large number of species have been described from 
Europe, Asia and America. They usually have been referred 
to under the generic name Coluber. Two species have been 
found within the geographic limits of the present work. 
They may be distinguished by the following 
Synopsis OF SPECIES 
a.—Gastrosteges more than 265; urosteges fewer than 95; 
supralabials 10 or 11. 
E. rosaliz.—p. 698. 
a’.—Gastrosteges fewer than 265; urosteges more than 95; 
supralabials eight or nine. 
E. chlorosoma.—p. 700. 
155. Elaphe rosaliz (Mocquard) 
YELLOW SNAKE 
Coluber rosalie Mocquarp, Nouv. Arch. Mus. Hist. Nat., Paris, Ser. 4, 
Vol. I, 1899, p. 321, pl. 12, figs. 1, 1a-b (type locality, Santa Rosalia, 
Lower California, Mexico). 
