48. CROTALUS 953 
tas, Agua Caliente, in the Cape Region; 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 sm in length. Mocquard records the statement 
that this species lives upon lizards. Camp mentions one 
which contained a nocturnal canyon mouse (Peromyscus 
crinitus stephensi). 
218. Crotalus cerastes Hallowell 
Hornepb RatrLEsNAKE 
Plates 104 and 116 
Crotalus cerastes HaLLOWELL, Proc. Acad. Nat. Sci. Phila., 1854, p. 95 
(type locality, Borders of the Mohave River and in the desert 
of the Mohave); Harrowe tt, Rep. Pac. R. R. Sury., Vol. X, 
1859, p. 17, pl. 1V, fig. 1; Kennicorrt, in Baird, U. S. Mex. Bound. 
Surv., Vol. II, 1859, p. 14, pl. III; Barrp, Rep. Pac. R. R. Surv., 
Vol. X, 1859, p. 16, pl. 35, fig. 4; Copr, 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. Génér. 
Ophid., 46e livr., 1874, pl. III, fig. 5; Cope, Bull. U. S. Nat. Mus., 
No. 1, 1875, p. 33; Cops, 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. 1, 
1884, p. 35; Corr, Proc. U.S. Nat. Mus., Vol. XIV, 1892, p. 694, 
SreyneceER, N. Amer. Fauna, No. 7, 1893, p. 216; Merriam, N. 
Amer. Fauna, No. 7, 1893, p. 217; SreyneEGER, Report U. S. Nat. 
Mus. for 1893, 1895, p. 450, pl. 15; BouLeNnceEr, Cat. Snakes Brit. 
Mus., Vol. HI, 1896, p. 583; Van Denspurcu, Occas. Papers Cal. 
Acad. Sci., V, 1897, p. 222; Copr, Report U. S. Nat. Mus. for 1898. 
1900, p. 1196, fig. 347; Brown, Proc. Acad. Nat. Sci. Phila., 1901, 
