The color above in alcoholic specimens is yellowish brown (cinnamon to mummy brown) paler on the head and limbs and often becoming fawn-color on the tail. The upper lip and all the lower surfaces are white or dull yellow. Young specimens are much darker than adults, and the lower surfaces often are minutely dotted with brown. Length to anus 25 36 49 52 52 56 Length of tail 20 31 64 56 63 59 Width of head 3½ 5 7 6½ 7 8 Snout to orbit 2 2 3 3 3 3 Snout to gular fold 6 7½ 10 10 10 10½ Snout to fore limb 7 10 13 13 14 14 Between limbs 15 22 31 36 33 38 Fore limb 5 7 9 9 8½ 9 Hind limb 5½ 7½ 9½ 9½ 9½ 10 =2. Sceloporus becki= sp. nov. PLATE IV. The _Sceloporus_ of the mainland at Santa Barbara is the ordinary _S. occidentalis_; that is to say, it is the smaller form with a complete series of scales between the large supraoculars and the median head plates, with from thirty-five to forty-six dorsal scales between the interparietal plate and the back of the thighs, with keeled scales on the back of the thigh, and with two blue patches on the throat. Five specimens from San Miguel Island resemble this species closely in size, but are more nearly like _S. biseriatus_ in coloration, and differ from both in the possession of certain characters most unusual in a member of the _S. undulatus_ group. I take pleasure in naming this island form in honor of Mr. R. H. Beck, who collected the specimens. _Diagnosis._--Frontal and parietal plates separated from enlarged supraoculars by a series of small scales or granules; frontoparietal plate in contact with enlarged supraoculars; scales on back of thigh smaller than those in front of anus; 43-48 dorsals between interparietal and back of thighs; scales on back of thigh keeled; whole throat and chin blue crossed by diagonal black lines which unite posteriorly with a large black patch extending across throat from shoulder to shoulder. _Type._--Adult male, Cal. Acad. Sci. No. 4537, San Miguel Island, California, R. H. Beck, March 26, 1903.