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Show 1897.] LIZARDS OF THE GENUS SCELOPORUS. 515 light streaks aud symmetrical dark markings, exactly as in S. scalarls. Lower parts, in the male, much spotted with black in addition to the blue ventral patches, the throat and belly sometimes nearly entirely blackish blue. Hab. Mexico. Becorded from the States of Vera Cruz, Puebla, and Jalisco. 25. SCELOPORUS SCALARIS. Sceloporus scalaris, Wiegm. Isis, 1828, p. 370, and Herp. Mex. p. 50, pl. viii. fig. 2 (1834); Bocourt, Miss. Sc. Mex., Eept. p. 202, pl. xviii. bis, fig. 9 (1874) ; Cope, Proc. A m . Philos. Soc xxii. 1885, p. 394; Bouleng. Cat. Liz. ii. p. 234 (1885); Duges, Naturaieza, (2) i. 1887, p. Ill; Giinth. Biol. C.-Am., Eept. p. 73 (1890). Tropidolepls scalaris, Gray, Griff. A. K . ix. Syn. p. 44 (1831), and Zool. Beechey's V o w p. 95, pl. xxx. fig. 3 (1839); D u m . & Bibr. Erp. Gen. iv. p. 310 (1837); Gray, Cat. Liz. p. 210 (1845). Head-shields keeled or striated; frontal transversely divided, in contact with the interparietal, which is as long as broad or longer than broad ; parietals very small, or broken up into scales; a more or less regular series of feebly enlarged transverse supraoculars, bordered inwards by one series of scales and separated from the supraciliaries by two or three series ; two canthal scales ; anterior border of ear very slightly denticulated. Dorsal scales larger than ventrals, strongly keeled, sharply pointed, forming parallel longitudinal lines; 33-48 scales between the interparietal shield and the base of the tail, 6-10 corresponding to. the length of the shielded part of the head. Lateral scales nearly as large as dorsals, more or less distinctly keeled, forming straight or very slightly oblique longitudinal series. Ventral scales smooth, mostly bicuspid. 34-46 scales round the middle of the body. The adpressed hind limb reaches the axilla, the shoulder, or between the shoulder and 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 equals the distance between the end of the snout and the ear or the collar-fold. 13-20 femoral pores on each side, meeting or narrowly separated on the praeanal region. Caudal scales as large as or larger than dorsals, strongly keeled. Males with enlarged postanal scales. Yellowish brown, reddish, or olive above, with four regular series of large crescentic brown spots, the series separated by more or less well-defined light longitudinal lines or stripes; head with symmetrical dark brown markings; a black or deep blue spot, often with a light blue centre, in front of the arm. Male yellowish white beneath, the throat spotted with blackish or with oblique blackish lines converging posteriorly; an elongate deep blue patch on each side of the belly. Eemale uniform yellowish |