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Show 1897.] LIZARDS OF T H E GENUS SCELOPORUS. 489 with the interparietal or separated from it by the frontoparietals; interparietal as long as broad, a little longer than broad, or a little broader than long, broader than the parietals, which are divided into two ; a series of four large transverse supraoculars, bordered inwards by an incomplete series of scales, the last two shields being in contact with the frontoparietals and parietals, and separated from the supraciliaries by one or two series of scales; two canthal scales ; three to six long pointed scales on the anterior border of the ear. Dorsal scales much larger than ventrals, as long as broad or broader than long, feebly keeled, not or but very shortly mucronate, strongly denticulate, the keels forming parallel series or very slightly converging towards the median line ; 30 ' to 35 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. Lateral scales nearly as large as dorsals and more strongly keeled, directed obliquely upwards and backwards. Ventral scales small, smooth, bi- or tricuspid. 36 to 38 scales round the middle of the body. The adpressed hind limb reaches the shoulder or the ear; tibia 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 ear. 11 to 15 femoral pores on each side. Caudal scales as large as dorsals, strongly mucronate. Males with enlarged postanal scales. d. Coahuilla Valley, S. Diego Co. Gilbert. d. S. Jacintho, S. Diego Co. Gilbert. U > >> v II ••• d. Arizona. Wright 1. 98 95 95 92 72 2. 19 18 19 18 15 3. 21 20 20 20 16 4. 22 20 20 22 17 5. 25 25 23 24 19 6. 30 35 32 31 32 7. 6 7 7 7 7 8. 36 36 37 38 36 9. 11-12 14-15 14-15 14-14 14-13 Dark bronzy brown above, uniform or the scales pale olive in the centre, or pale brown with dark brown cross-bands, the dark bands broader than the pale interspaces. Lower parts leaden grey in females, pale blue in young males, blackish blue in adult males. Hab. San Diego Co., California. The British Museum has also received a specimen among a collection of Eeptiles from Arizona, presented by Dr. W . G. Wright. 10. SCELOPORUS SPINOSUS. Sceloporus spinosus, Wiegm. Isis, 1828, p. 370, and Herp. Mex. p. 50, pl. vii. fig. 3 (1834); Baird, U.S. Mex. Bound. Surv., Eept. p. 5, pl. xxix. figs. 4-6 (1859); Bocourt, Miss. Sc. Mex., Eept. p. 174, pl. xviii. fig. 2 (1874); Cope, Proc. Amer. Phdos. Soc. |