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Show 514 MR. G. A. BOULENGER ON THE [May 18, 24. SCELOPORUS JENEUS. Sceloporus ceneus, Wiegm. Isis, 1828, p. 370, and Herp. Mex. p. 52 (1834); Bocourt, Miss. Sc. Mex., Eept. p. 205, pl. xviii. bis, fig. 4 (1874); Cope, Proc. A m . Philos. Soc xxii. 1885, p. 394; Bouleng. Cat. Liz. ii. p. 233 (1885); Gunth. Biol. C.-Am., Eept. p. 74 (1890). Tropidolepls ceneus, Gray, Griff. A. K . ix. Syn. p. 44 (1831); D u m . & Bibr. Erp. Gen. iv. p. 309 (1837). Head-shields keeled or striated ; frontal transversely divided, in contact with the interparietal, or separated from it by a small azygous shield; 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; one or two canthal scales ; anterior border of ear very slightly denticulated. Dorsal scales larger than ventrals, strongly keeled, sharply pointed or tricuspid, forming parallel longitudinal lines; 39-44 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 as large as or little smaller than dorsals, more or less distinctly keeled, forming straight or very slightly oblique longitudinal series. Ventral scales smooth, mostly bicuspid. 36-48 scales round the middle of the body. The adpressed hind limb reaches hardly the axilla or the shoulder; tibia shorter 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 anterior or the posterior border of the ear. 14-19 femoral pores on each side, meeting or narrowly separated on the praeanal region. Caudal scales as large as or a little larger than dorsals, strongly keeled, sharply pointed. Males with enlarged postanal scales. 4. 11 9 9 9 9 9 9 9 8 9 9 8 5. 13 13 12 13 12 12 12 13 11 12 11 10 6. 41 40 40 42 42 44 39 41 41 40 40 41 7. 8 9 6 8 8 10 8 9 8 8 8 8 8. 40 40 40 48 42 42 36 42 44 40 44 42 9. 17-17 19-19 17-18 16-16 15-15 18-16 18-17 16-15 14-14 15-15 17-16 15-15 d- Puebla. Boucard d-s 2 2 . Orizaba tf Jalisco, N. of R. de Santiago Smith 2 d 2 2 2 2 La Cumbre de los Arrastrados Jalisco. Buller , n n n H. Sta. Gertrudis, Jalisco Buller Mexico, Boucard 1. 60 50 56 54 53 46 47 49 43 50 49 47 2. 12 11 10 10 11 10 10 10 9 10 10 9 3. 13 12 11 11 12 11 11 11 10 11 10 10 Olive, bronzy brown, or reddish brown above, uniform, or with |