13. CEOIALTJS. 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, 

 <Jorsals strongly keeled. Ventrals 178-198 ; anal entire ; sub- 

 oaudals 247-26. 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 



Prod?: pi. E (1859). 

 intermedius, Trosch. in Mull. Meise Mexico, iii. p. 613 (1865) ; 



Fischer, Abh. Nat. Ver. Bremen, vii. 1882, p. 230, pi. xiv. 



figs. 1-4. 

 Caudisona triseriata. Cope, Proc. Ac. Philad. 1866, p. 309. 



lugubris, Dugis, Naturaleza, iv. 1876, p. 26. 



triseriatus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 179, 



and Proc. U.S. Nat. Mm. xiv. 1892, p. 689. 

 omiltemanus, Criinth. Biol. C.-Am., Rept. p. 192, pi. Iviii. fig 



(1895). 

 paUidus, Griinth. I. c. p. 193, pi. 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, e pale brown above, with mere traces 

 of darker markings, yellowish beneath. 



Total length 530 millim, ; tail 55. 



Mexico. 



«. 2 , head and neck and La Cumbre de loa Arras- Dr. A. C. Buller [C.]. 



tail (Sc. 25 ; 0. 25). trades, JaUsco, 8500 ft. 



b. Yg. (Sc. 23 ; V. 149 ; La Laguna, Juanacatlan, Dr. A. 0. BuUer [0.]. 



C. 24). Jalisco. 



e. (J (Sc. 25; V. 149; City of Mexico. Mr. Doorman [C.]. 



C. 29). (Type of C. pallidus.) 



