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Show 1897.] LIZARDS OF THE GENUS SCELOPORUS. 501 Hab. Lower California. Numerous specimens were obtained at San Jose del Cabo, Miraflores, and in the Sierra San Lazaro and Sierra El Taste. 15. SCELOPORUS FORMOSUS. Sceloporus formosus, Wiegm. Herp. Mex. p. 50, pl. vii. fig. 2 (1834); Bocourt, Miss. Sc. Mex., Eept. p. 182, pl. xviii. fig. 3 (1874); Bouleng. Cat. Liz. ii. p. 222 (1885). Tropidolepls formosus, Dum. & Bibr. Erp. Gen. iv. p. 303 (1837). Sceloporus malachlticus, Cope, Proc. Ac. Philad. 1864, p. 178, and Proc. Amer. Philos. Soc. xxii. 1885, p. 394. Sceloporus luncel, Bocourt, 1. c. p. 184, pl. viii. bis, fig. 5; Cope, 1. c. p. 395; Gunth. Biol. C.-Am., Eept. p. 67 (1890). Sceloporus smaragdlnus, Bocourt, 1. c. p. 186, pl. xviii. fig. 6 and pl. xix. fig. 1 ; Giinth. 1. c. p. 68. Sceloporus vlvlparus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 398. Sceloporus tcenlocnemls, Cope, 1. c. p. 399. Sceloporus torquatus formosus, Cope, I. c. p. 402. Sceloporus Irazuensls, Giinth. 1. c. p. 67. Sceloporus salvlnl, Giinth. 1. c. p. 68. Head-shields smooth; frontal transversely divided, usually iii contact with the interparietal; latter as long as broad or a little broader than long, much larger than the parietals, which may be divided ; a series of three to five more or less enlarged, transverse supraoculars, bordered inwards by a complete or incomplete series of scales; one, two, or three series of scales between the large supraoculars and the supraciliaries; one or two canthal scales; three or four pointed scales, not or but a little larger than those before them, form a denticulation on the anterior border of the ear. Dorsal scales much larger than ventrals, as long as broad or a little broader than long, strongly keeled, moderately or shortly mucronate, entire or tri- or quinque-cuspid, the keels forming parallel lines or obliquely converging towards the middle line on the posterior part of the back; 35-45 scales between the interparietal shield and the base of the tail; 8 or 9 scales (exceptionally 10), taken in the middle of the back, correspond to the length of the shielded part of the head. Lateral scales graduating into dorsals and ventrals, strongly keeled, pointing upwards and backwards. Ventral scales small, smooth, bi- or tricuspid. 38-52 scales round the middle of the body. The adpressed hind limb reaches the shoulder, the collar-fold, or the ear; tibia as long as or slightly longer than the shielded part of the head ; the distance between the base of tbe fifth toe and the extremity of the fourth equals or slightly exceeds the distance between the end of the snout and the collar-fold. 11-16 femoral pores on each side. Caudal scales as large a§ or a little larger than dorsals, strongly keeled and mucronate. Males with enlarged postanal scales. As Bocourt, Cope, and Giinther all agree to consider the |