13. CROTALUS. 581 
Snout without canthus. Rostral broader than deep, separated 
from the anterior nasal by scales ; upper head-scales small, striated ; 
supraoculars striated ; three series of scales between the eye and 
the labials; 14 to 16 upper labials. Scales in 25 rows, striated, - 
dorsals strongly keeled. Ventrals 178-198; anal entire; sub- 
caudals 24-26. Greyish yellow to salmon-red above, finely 
punctulated with brown, with a dorsal series of transverse darker 
spots ; yellowish beneath. 
Total length 1020 millim.; tail 90. | 
Desert Regions of Southern California, Lower California, and 
Arizona. 
8. Crotalus triseriatus. 
Uropsophus triseriatus, Wagl. Syst. Amph. p. 176 (1830). 
Crotalus lugubris, part., Jan, Rev. § Mag. Zool. 1859, p. 156, and 
Prodr, pl. E (1859). 
intermedius, T’rosch. in Miill. Reise Mexico, iii. p. 613 (1865) ; 
Fischer, Abh, Nat. Ver. Bremen, vii. 1882, p. 230, pl. xiv. 
figs. 1-4. 
Candids triseriata, Cope, Proc. Ac. Philad. 1866, p. 309. 
lugubris, Dugés, Naturaleza, iv. 1876, p. 25. 
triseriatus, Cope, Proc. Amer. Philos. Soc, xxii. 1885, p. 179, 
and Proce. U.S. Nat. Mus. xiv. 1892, p. 689. 
—— omiltemanus, Giinth. Biol. C-Am., Rept. p. 192, pl. lviii. fig C 
(1895). 
—— pallidus, Giinth. 1. ¢. p. 193, pl. lix. fig. B. 
Canthus rostralis distinct. Rostral as deep as broad, well visible 
from above, in contact with the anterior nasals and a pair of inter- 
nasals ; internasal separated from the supraocular by a large shield ; 
one to five small smooth shields on the middle of the snout; supra- 
oculars as broad as the space between them, which is occupied by 
three to five longitudinal series of scales ; one or two series of scales 
between the eye and the labials; 9 to 13 upper labials. Scales in 
21 to 25 rows, dorsals strongly keeled. Ventrals 142-184; anal 
entire ; subcaudals 22-30. Olive or brown above, with a vertebral 
series of rather small dark brown spots with a fine black-and-light 
edge ; sides with two or three series of smaller spots ; upper surface 
of head with or without small dark spots; a dark, light-edged band 
from the eye to the angle of the mouth or beyond; yellowish 
beneath, spotted or speckled with dark brown, or dark grey-brown _ 
powdered with whitish. Spec. ¢ pale brown above, with mere traces 
of darker markings, yellowish beneath. 
Total length 530 millim.; tail 55. 
Mexico. 
a. 2, head andneckand La Cumbre delos Arras- Dr. A. C. Buller[C.], 
tail (Sc. 25 ; C. 25). trados, Jalisco, 8500 ft. 
b. Yg. (Sc. 28; V.149; La Laguna, Juanacatlan, Dr. A. C. Buller[C.]. 
©, 24). Jalisco. . 
ec 3 (Se. 25; V. 149; City of Mexico. Mr. Doorman Sneek 
C. 29). (Type of C. pallidus.) 
