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Show 490 MR. G. A. BOULENGER ON THE [May 18, xxii. 1885, p. 395; Bouleng. Cat. Liz. ii. p. 226 (1885); Duges, La Naturaleza, (2) i. 1889, p. 205. Tropidolepls spinosus, Gray, Griff. A. K . ix. Syn. p. 43 (1831); Dum. & Bibr. Erp. Gen. iv. p. 304 (1837) ; Gray, Cat. Liz. p. 209 (1845). Sceloporus horrldus, Wiegm. Herp. Mex. p. 50; Bocourt, 1. c. p. 178, pl. xviii. fig. 8; Cope, 1. c. p. 394. Tropidolepls horrldus, Dum. & Bibr. t. c. p. 306; Gray, Cat. p. 209. Sceloporus clarkll, Baird & Gir. Proc. Ac. Philad. 1852, p. 127, and U.S. Mex. Bound. Surv., Eept. p. 5 ; Yarrow, Wheeler's Eep. Explor. W . 100th Mer. v.p.575,pl. xxiii. fig. 1 (1875); Stejneger, N. Amer. Eaun. no. 3, 1890, p. 110, and no. 7, 1893, p. 178, pl.i fig. 1. Sceloporus magister, Hallow. Proc. Ac. Philad. 1854, p. 93, and Eep. U.S. Explor. Surv. E. E . x. pt. iv. p. 5 (1859); Stejneger, N. A m . Eaun. no. 7, 1893, p. 178, pl. i. fig. 2. Sceloporus fioridanus, Baird, Proc. Ac. Philad. 1858, p. 254; Stejneger, 1. c. p. 181, pl. i. fig. 6. Sceloporus ollgoporus, Cope, Proc. Ac. Philad. 1864, p. 177. Sceloporus thayerli (non B. & G.), Bocourt, 1. c. p. 175, pl. xviii. fig. 5. J Sceloporus spinosus, part., Giinth. Biol. C.-Am., Eept. p. 63 (1890). Sceloporus boulengeri, Stejneger, 1. c. p. 180, pl. i. fig. 5. Head-shields smooth; frontal transversely divided (exceptionally single), usually in contact with the interparietal, sometimes separated from it by the frontoparietals or by a small azygous shield ; interparietal as long as broad, a little longer than broad, or a little broader than long, nearly as broad as or broader than the parietals; a series of three to five large, transverse supraoculars, which are rarely broken up into two series as in S. torquatus v. poinsetti2; a complete or incomplete series of scales on the inner side of the enlarged supraoculars, the last or last two of which are sometimes in contact with the frontoparietals or frontoparietals and parietals; one or two series of small scales between the large supraoculars and the supraciliaries ; two canthal scales (exceptionally one); three to six pointed scales on the anterior border of the ear, in some specimens not larger than those in front of them, in others larger and sometimes much longer than broad. Dorsal scales much larger than ventrals, as long as broad, strongly keeled, mucronate, and usually denticulate, the keels forming parallel series or, rarely, slightly converging towards the median line ; 25 to 32 scales between the interparietal shield and the base of the tail; 5 to 7 scales, 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, directed obliquely upwards and backwards. Ventral scales small, smooth, bi- or tricuspid. 34 to 40 scales round the middle of the body. 1 This is particularly marked in a specimen from Puebla. |