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Show *yD MR. G. A. BOULENGER ON THE [May 18 2. Forma typlca. Eemoral pores 7-10 ; auricular scales usually not or but slightly longer than broad. 3. Var. clarkli, B. & G . Femoral pores 11-13; auricular scales not longer than broad. 4. Var. magister, Hallow. Eemoral pores 11-17; auricular scales usually much longer than broad. Hah. Mexico west of the Isthmus of Tehuantepec; northwards to Nevada, Utah, Colorado, Texas, and Western Elorida. 11. SCELOPORUS ACANTHINUS. Sceloporus acanthinus, Bocourt, Miss. Sc. Mex., Eept. p. 180 pl. xviii. fig. 10, & pl. xix. fig. 4 (1874); Cope, Proc. Amer. Philos! Soc. xxii. 1885, p. 396; Bouleng. Cat. Liz. ii. p. 221 (1885)- Gunth. Biol. C.-Am., Eept. p. 65 (1890). Sceloporus spinosus, part., Giinth. 1. c. p. 63. Sceloporus vlvlparus (non Cope), Giinth. 1. c. p. 64. _ Head-shields smooth ; frontal transversely divided, rarely single, in contact with the interparietal; latter as long as broad or a little longer than broad, broader than the parietals; a series of four or five large transverse supraoculars, bordered inwards by a complete or incomplete series of scales, the last two plates rarely in contact with the frontoparietals and parietals; one or two series of scales between the large supraoculars and the supraciliaries; two canthal scales; four or five pointed scales, not or but little larger than those before them, form a denticulation in front of the ear. Dorsal scales much larger than ventrals, as long as broad or longer than broad, strongly keeled and mucronate, denticulate, the keels forming parallel or slightly oblique series; 26-32 scales between the interparietal shield and the base of the tail; 6 or 7 scales, taken in the middle of the back, correspond to the length of the shielded part of the head (8 in some young, owing to the proportionally larger head). Lateral scales graduating into dorsals and ventrals, strongly keeled, directed obliquely upwards and backwards. Ventral scales small, smooth, bi- or tricuspid; 35-40 scales round the middle of the body. The adpressed hind limb reaches 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 the fifth toe and the extremity of the fourth exceeds the distance between the end of the snout and the posterior border of the ear. 14-16 (exceptionally 13 or 17) femoral pores on each side. Caudal scales as large as or a little smaller than dorsals, strongly keeled, mucronate, and denticulate like the dorsals. Males with enlarged postanal scales. I have examined a good number of specimens, which show the following variations in the proportions, the lepidosis, and the number of femoral pores :- |