580 VIPERIDE. 
e. d (Sc. 23; V. 167; N. America. College of Surgeons.. 
ig (Se. 25; V.173; N. America. 
g. 8 
N, America. 
6. Crotalus tigris. 
Crotalus tigris, Kennicott, Rep. U.S. Mex. Bound. Surv. ii., 
Rept. 
14, pl. iv. ay. (1859) Garm. N. Am. Rept. p. 117 (1883); Cope, 
ay pu Nat. Mus. xiv. 1892, pee Sterneger, IN. Am. Faun. 
no. 7, p. 214 (1893), and Rep. U.S. Nat. Mus. f. 1893, p. 449 
(1895). 
Caudisona enyo, Cope, Proc. Ac. Philad. 1861, p. 293, and 1866, 
309. 
soe tigris, Cope, Proc. Ac. Philad. 1866, p. 309. 
Crotalus enyo, Cope, Check-list N. Am. Rept. p. 38 Siege 
Proc. U.S. Nat. Mus. xiv. 1892, p. 689. 
—— oregonus, var. enyo, Garm. U. ¢. p- 174. 
Snout with distinct canthus. Rostral broader than deep, in 
contact with the anterior nasal and a pair of internasals; a ara 
shield on each side between the internasal and the supraocular; 
middle of snout covered with small smooth or obtusely keeled scales ; 
supraoculars narrower than the space between them, which is 
occupied by six longitudinal rows of keeled scales; three series of 
scales between the eye and the labials; 13 to 15 upper labials. 
Scales in 23 or 25 rows, dorsals strongly keeled. Ventrals 166— 
181; anal entire; subcaudals 26-46. Yellowish or pale brown 
above, with a dorsal series of brown, dark-edged spots, widening to 
cross-bands posteriorly ; sides with smaller dark spots; head with 
small dark spots and a dark streak from the eye to the angle of the 
mouth ; yellowish beneath, scantily spotted with brown. 
Total length 380 millim.; tail 50. 
Southern California, Lower California, Nevada, Colorado, Arizona, 
Northern Mexico. 
a. pL oh ee 25; V. 181; Ventanas, Durango. Hr. A. Forrer [C.]. 
. 46). 
7. Crotalus mitchelli. 
Caudisona mitchellii, Cope, Proc. Ac. Philad, 1861, p. 293, and 1866, 
. 810. 
: yrrha, Cope, Proc, Ac. Philad. 1866, rP. 808. 
ae lag mitchellii, Cope, Wheeler’s Rep. Surv. W. 100th Mer. v. ° 
535 (1875), and Proc. U.S. Nat. Mus. xiv. 1892, p. 689; Van 
iat rgh, Proc, Cal, Acad, (2) iv. 1894, p. 450; Stejneger, Rep. 
US. Vat. Mus. f. 1893, rp. 454, pl. xvii. (1895). 
pyrrhus, Cope, Wheeler's Rep. p . 585, pl. ar and Proc, U.S. 
Nat. Mus. xiv. 1892, p. 689; Biefeigen W. Amer. Scient. vii. 
1891, p. 165, 
— confluentus, var. pyrrhus, Garm. N. Am, Rept. p. 178 (1883). 
—— oregonensis, yar. mitchellii, Garm, 1. ¢, 
