+8. C ROT ALUS 



A specimen (C. A. S. No. 13586) from South Coronado 

 Island had eaten a lizard, Plestiodon skiltonianus. 



215. Crotalus enyo Cope 



Lower California Rattlesnake 



Plate 103 



Caudisona enyo Cope, Proc. Acad. Nat. Sci. Phila., i86i, p. 29J (type 

 locality, Cape St. Lucas, Lower California); Cope, Proc. Acad. 

 Nat. Sci. Phila., 1866, p. 309. 

 Crotalus enyo Cope, Bull. U. S. Nat. Mus., No. i, 1875, P- 2.3'- Cope in 

 Yarrow, Surv. W. looth Merid., Vol. V, 1875, p. 534; Yarrow, 

 Bull. U. S. Nat. Mus., No. 24, 1883, pp. 12, 74; Cope, Bull. U. S. 

 Nat. Mus., No. 32, 1887, p. 90; Belding, West American Scientist, 

 Vol. Ill, No. 24, 1887, p. 98; Cope, Proc. U. S. Nat. Mus., Vol. 

 XIV, 1892, p. 693; Van Denburgh, Proc. Cal. Acad. Sci., Ser. 2, 

 Vol. 5, 1895, p. IS7; Me Lain, Contributions to Neotropical Her- 

 petology, 1899, p. 5; Cope, Report U. S. Nat. Mus. for 1898, 1900, 

 p. 1189, fig. 343; MocQUARD, Miss. Sci. au Mexique, Pt. Ill, Rept., 

 1909, p. 967, pi. 77, figs. 4, 4a; Stejneger & Barbour, Check List 

 N. Amer. Amph. Rept., 1917, p. 109; Van Denburgh & Slevin, 

 Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 5.I, 7'; Nelson, 

 Mem. Nat. Acad. Sci., Vol. XVI, 1921, pp. 114, 115; Terron, 

 Mem. y Rev. Soc. Cient. Antonio .'\lzate. Vol. 39, 1911, p. 164. 

 Crotalus oregonus var. enyo Garman, Mem. Mus. Compr. Zool., Cambr., 

 Vol. VIII, No. 3, 1883, p. 174; Garman, Bull. Essex Inst., Vol. 

 XVI, No. I, 1884, p. 35. 

 Crotalus tigris Boulenger, Cat. Snakes Brit. Mus., Vol. Ill, 1896, 

 p. 580 (part); Mocquard, Nouv. Arch. Mus. Hist. Nat., Paris, 

 Ser. 4, Vol. I, 1899, p. 333; Terron, Mem. y Rev. Soc. Cient. 

 Antonio Alzate, Vol. 39, 1921, p. 188. 



Description. — S i z e moderate. Head broad, flat- 

 topped. Rostral as high as, or higher than, wide, in con- 

 tact with anterior nasal. Two nasals. Two preoculars. 

 Three postoculars. A large scale just in front of supra- 

 ocular. Supraocular large but not raised into a horn-like pro- 

 cess} separated from its fellow by from three to five irregu- 

 lar rows of scales. Thirteen to 15 superior and 13 to 15 

 inferior labials, first pair of latter in contact on median line 



