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Show 498 MR. G. A. BOULENGER ON THE [May 18, enlarged supraoculars, bordered inwards by one series of very small scales and separated from the supraciliaries by two series of small scales; two canthal scales ; three or four pointed scales smaller than those in front of them, form a denticulation on the anterior border of the ear. Dorsal scales much larger than ventrals, as long as broad, strongly keeled and mucronate, scarcely denticulate, the keels converging more or less distinctly towards the median line; 28 to 32 scales between the interparietal shield and the base of the tail: 7 scales, taken in the middle of the back, correspond to the length of the shielded part of the head. Lateral scales keeled, graduating into the dorsals and ventrals, directed obliquely upwards and backwards. Ventral scales small, smooth, bicuspid. 38 to 44 scales round the middle of the body. The adpressed hind limb reaches the ear ; tibia nearly as long as the shielded part of the head ; the distance between the base of the fifth toe and the extremity of the fourth equals the distance between the end of the snout and the collar-fold. 17 to 21 femoral pores on each side. Caudal scales as large as dorsals, very strongly keeled and mucronate, the keels forming continuous longitudinal ridges. Males with enlarged postanal scales. 1. 85 85 70 72 69 2. 18 19 15 15 14 3. 21 22 16 17 15 4. 18 IS 14 14 14 5. 24 24 20 21 20 6. 30 30 28 32 30 7. 7 7 7 7 7 8. 42 40 38 42 44 9. 21-19 18-19 17-17 17-17 18-18 Males olive or green above, uniform blue-green beneath; no collar, but a rather indistinct blackish blotch in front of the shoulder. Females brown above, with ill-defined darker spots or chevron-shaped cross-bars; whitish beneath, uniform or throat bluish. Hab. A few specimens, of which the measurements and other particulars are recorded above, were obtained by Dr. A. C. Buller at La Cunibre de los Arrastrados, State of Jalisco, at an altitude of 8500 feet. 13. SCELOPORUS ZOSTEROMUS. Sceloporus zosteromus, Cope, Proc. Ac. Philad. 1863, p. 105, and Proc. Amer. Philos. Soc. xxii. 1885, p. 395 ; Bouleng. Cat. Liz. ii. p. 225 (1885); Stejneger, N . Amer. Faun. no. 7, 1893, p. 181, pl. i. fig. 3; Van Denburgh, Proc. Calif. Acad. (2) v. 1895, p. 108. Sceloporus clarkil zosteromus, Cope, Check-List N. A m . Eept. p. 49 (1875). d1. La Cumbre de los Arrastrados. Buller. d • >i n n 4- • II )i n + • n n n + • ii n n |