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Show 1897.] LIZARDS OF THE GENUS SCELOPORUS. 509 merging into dorsals and ventrals. Ventral scales smooth, mostly entire. 46-50 scales round the middle of the body. The adpressed hind limb reaches the ear; tibia as long as the shielded part of the head; the distance between the base of the fifth toe and the extremity of the fourth slightly exceeds the distance between the end of the snout and the posterior border of the ear. 13-16 femoral pores on each side. Caudal scales much larger than dorsals, strongly keeled. Males with enlarged postanal scales. Olive above, with transverse black spots; a narrow black scapular collar, interrupted in the middle. Male with a blue, black-edged patch on each side of tbe belly. A small species, the largest specimen on record measuring 66 millim. from snout to vent. I have examined only two half-grown specimens from Guatemala. Hah. The few specimens known come from Mexico (Oaxaca, Mirador, Tehuantepec) and Guatemala. 20. SCELOPORUS MICROLEPIDOTUS. Sceloporus grammicus, var. a, Wiegm. Isis, 1828, p. 370. Sceloporus microlepidotus, Wiegm. Herp. Mex. p. 51 (1834); Bocourt, Miss. Sc Mex., Eept. p. 194, pl. xviii. bis, fig. 13 (1874); Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 395; Bouleng. Cat. Liz. ii. p. 232 (1885); Duges, Naturaleza, (2) i. 1888, p. 112, pl. xi. fig. 5 ; Giinth. Biol. C.-Am., Eept. p. 72 (1890). Tropidolepls microlepidotus, Dum. & Bibr. Erp. Gen. iv. p. 308 (1837); Gray, Cat. Liz. p. 209 (1845). Sceloporus dispar, Baird & Gir. Proc. Ac. Philad. 1852, p. 127. Sceloporus rubriventris, Giinth. 1. c. pl. xxxii. fig. C.1 Head-shields smooth or slightly rugose; frontal transversely divided, in contact with the interparietal or separated from it by a small azygous shield ; interparietal as long as broad or a little broader than long; parietals small or broken up into scales ; one or two series of transversely enlarged supraoculars, bordered inwards by one series of scales and separated from the supraciliaries by two to four series ; two canthal scales; anterior border of ear with a denticulation of slightly enlarged pointed scales. Dorsal scales not or but slightly larger than ventrals, strongly keeled, not or but slightly mucronate, forming oblique longitudinal series converging towards the median line; 60-83 scales between the interparietal shield and the base of the tail, 12-20 corresponding to the length of the shielded part of the head. Lateral scales keeled, directed upwards and backwards. Ventral scales smooth, entire or bicuspid. 62-78 scales round the middle of the body. The adpressed hind limb reaches the shoulder or the ear; tibia 1 Founded partly on the erroneous assumption that both sexes are coloured alike. The two specimens described are females. The number of scales in a series along the middle of tbe back Taries much more than between 62 and 68 in the specimens referred by Giinther to S. microlepidotus. PROC. ZOOL. Soc-1897, No. XXXIV. 34 |
