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Show 1897.] LIZARDS OF THE GENUS SCELOPORUS. 519 Caudal scales as large as or a little larger than dorsals, strongly keeled, shortly mucronate. Males with enlarged postanal scales. O 2. S. Domingo de Guzman, Oaxaca. Buller d Teapa Tabasco. Smith (1) 0 ,, ,, O ,. ., o ¥• " 1. 65 56 58 74 66 61 62 61 57 2. 14 12 13 15 14 13 13 13 12 3. 15 13 14 17 16 14 14 14 13 4. 15 13 14 17 16 15 15 14 13 5. 20 16 17 20 20 20 19 18 18 6. 39 43 40 40 39 39 40 40 42 7. 9 9 9 9 9 9 8 9 9 8. 46 42 42 40 46 44 42 44 46 9. 14-13 14-13 11-12 9-11 10-10 12-13 10-11 10-11 13-12 (1) Types of 8. teapensis. This table shows such approximation to S. variabilis in the number of scales as to render it probable that a larger series would completely bridge over the gap now believed to exist between the two species, in which case they would have to be united. Coloration exactly as in S. variabilis, the ground-colour of the upper parts varying from pale golden to dark bronzy olive, wdth more or less distinct lighter lateral bands ; a black spot wdth an oblique white streak above the shoulder. Hah. This species, which has been erroneously referred to the synonymy of S. chrysostictus by Cope, is only known from tbe States of Oaxaca, whence the type specimens w7ere obtainedl, and Tabasco. 28. SCELOPORUS SINIPERUS. Sceloporus slnlferus, Cope, Proc. A m . Philos. Soc. xi. 1869, p. 157 ; Bocourt, Journ. de Zool. v. 1876, p. 342 ; Cope, Proc A m . Philos. Soc xxii. 1885, p. 394 ; Bouleng. Cat. Liz. ii. p. 237 (1885); Giinth. Biol. C.-Am., Eept. p. 76 (1890). Sceloporus humeralls, Bocourt, Miss. Sc. Mex., Eept. p. 206, pl. xviii. bis, fig. 3 (1874). Head-shields keeled or striated, rarely nearly smooth ; frontal transversely divided, the anterior or both the anterior and posterior portions longitudinally bisected, separated from the interparietal by a pair of frontoparietals; interparietal broader than long, usually followed by a band-like shield ; parietals small or broken up into scales ; four or five large transverse supraoculars, bordered inwards by a complete or incomplete series of scales and separated 1 The agreement between our female specimens from Oaxaca and the female, -which was likewise obtained together with S. siniferus, is so close that I cannot entertain tbe least doubt as to the correctness of my identification. But it must be mentioned that Bocourt describes the male as without sexual markings, whilst our specimens have the belly coloured as in 8. variabilis. have, however, examined a male of the latter species (from H. del Bobo) in which the ventral markings are very indistinct. |