48. CROTALUS 



tas, Agua Caliente, in the Cape Region j San Evaristo, Santa 

 Rosalia, Mulege, San Ignacio, Parral, and San Matias far- 

 ther north, and on Santa Margarita, Angel de la Guardia, 

 San Jose, Espiritu Santo, and Ceralbo islands. 



Habits. — This seems to be distinctively a desert species. 

 Like other rattlesnakes, it is viviparous. A specimen taken 

 at San Jose del Cabo, in September, contained three young 

 about 260 mm in length. Mocquard records the statement 

 that this species lives upon lizards. Camp mentions one 

 which contained a nocturnal canyon mouse {Peromyscus 

 crinitus ste-phens'i) . 



218. Crotalus cerastes Hallowell 



Horned Rattlesnake 

 Plates 104 and 116 



Crotalus cerastes Hallowell, Proc. Acad. Nat. Sci. PhiJa., 1854, p. 95 

 (type locality, Borders of the MohavcRiver and in the desert 

 of the Mohave) ; Hallowell, Rep. Pac. R. R. Surv., Vol. X, 

 1859, p. 17, pi. IV, fig. i; Kennicott, in Baird, U. S. Mex. Bound. 

 Surv., Vol. II, 1859, p. 14, pi. Ill; Baird, Rep. Pac. R. R. Surv., 

 Vol. X, 1859, p. 16, pi. 35, fig. 4; Cope, Proc. Acad. Nat. Sci. Phila., 

 1859, p. 337; Jan, Elenco Sist. degli Ofidi, 1863, p. 124; Cooper, 

 Proc. Cal. Acad. Sci., Vol. IV, 1870, p. 67; Jan, Iconogr. Gener. 

 Ophid., 46e livr., 1874, pi. Ill, fig. 5; Cope, Bull. U. S. Nat. Mus., 

 No. I, 1875, p. 33; Cope, in Yarrow, Surv. W. 100th Merid., Vol, 

 V, 1875, p. 534; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1875, 

 pp. 12, 73; Garman, Mem. Mus. Compr. Zool., Cambr., Vol. VIII; 

 No. 3, 1883, pp. 116, 175; Yarrow, Buck's Ref. Handb. Med. Sci., 

 Vol. VI, 1888, p. 166; Garman, Bull. Essex Inst., Vol. XVI, No. i, 

 1884, p. 35; Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 694, 

 Stejneger, N. Amer. Fauna, No. 7, 1893, p. 216; Merriam, N. 

 Amer. Fauna, No. 7, 1893, p. 217; Stejneger, Report U. S. Nat. 

 Mus. for 1893, 1895, p. 450, pi. 15; Boulenger, Cat. Snakes Brit. 

 Mus., Vol. Ill, 1896, p. 5 83; Van Denburch, Occas. Papers Cal. 

 Acad. Sci., V, 1897, p. 222; Cope, Report U. S. Nat. Mus. for 1898. 

 1900, p. 1196, fig. 347; Brown, Proc. Acad. Nat. Sci. Phila., 1901, 



