SANTA MARGARITA ISLAND. Five reptiles are known from this island. I have not seen specimens of the _Bascanion_ and cannot judge of its distinctness. =1. Callisaurus ventralis= (_Hallowell_). _Callisaurus ventralis_ VAN DENBURGH, Proc. Cal. Acad. Sci. 2d ser. v. 5, 1895, p. 98. A female of this species, taken on Santa Margarita by Mr. Bryant, March 5, 1889, is in the collection of the Academy. =2. Sceloporus zosteromus= _Cope_. _Sceloporus zosteromus_ VAN DENBURGH, Proc. Cal. Acad. Sci. 2d ser. v. 5, 1895, p. 110; BOULENGER, Proc. Zool. Soc. Lond. 1897, p. 499; MOCQUARD, Nouv. Arch. Mus. sér. 4, 1899, p. 314; COPE, Report, U. S. Nat. Mus. 1898 (1900), p. 358. Two examples were secured by Mr. Bryant on Santa Margarita, March 1, 1889. =3. Cnemidophorus rubidus= _Cope_. _Cnemidophorus tessellatus rubidus_ COPE, Trans. Am. Philos. Soc. 1892, p. 36, pl. XII, fig. F; COPE, Report, U. S. Nat. Mus. 1898 (1900), p. 584, fig. 110. _Cnemidophorus rubidus_ VAN DENBURGH, Proc. Cal. Acad. Sci. 2d ser. v. 5, 1895, p. 127. Santa Margarita Island is the type locality of this species, which was described from seven specimens brought back by the _Albatross_. =4. Bascanion laterale fuliginosum= (_Cope_). _Bascanion laterale_ COPE, Proc. U. S. Nat. Mus. v. 12, 1889, p. 147. _Zamenis lateralis fuliginosus_ COPE, Am. Nat. v. 29, 1895, p. 679; COPE, Report, U. S. Nat. Mus. 1898 (1900), p. 809, fig. 178. This snake was described from two specimens taken by the naturalists of the _Albatross_. I have seen none. =5. Crotalus mitchellii= _Cope_. _Crotalus mitchellii_ VAN DENBURGH, Proc. Cal. Acad. Sci. 2d ser. v. 5, 1895, p. 160; COPE, Report, U. S. Nat. Mus. 1898 (1900), p. 1196. A single rattlesnake of this species, taken by Mr. W. E. Bryant in February, 1889, is the only record for this island. SOCORRO ISLAND. The following lizard is the only reptile known from this island. =1. Uta auriculata= _Cope_. _Uta auriculata_ COPE, Proc. Bost. Soc. Nat. Hist. v. 14, 1871, p. 303; BOULENGER, Cat. Liz. Brit. Mus. v. 2, 1885, p. 214; COPE, Bull. U. S. Nat. Mus. no. 32, 1887, p. 35; TOWNSEND, Proc. U. S. Nat. Mus. v. 13, 1890, p. 143; COPE, Report, U. S. Nat. Mus. 1898 (1900), p. 300. This _Uta_ was first described by Cope in 1871 from material collected by Grayson. Townsend secured nine specimens which are now in the National Museum. The California Academy of Sciences has seventeen, taken by its expedition to the Revilla Gigedo Islands in 1903. CLARION ISLAND. Although smaller than Socorro and farther from the mainland, Clarion Island is better supplied with reptiles than its larger neighbor, since it possesses a snake as well as a _Uta_, while Socorro has only a _Uta_.