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Show 488 MR. G. A. BOULENGER ON THE [May 18, of Louisiana. It has since been recorded from Montana, Nebraska, Utah, Nevada, Arizona, and N e w Mexico. In addition to the three specimens from Dakota, tabulated above, the British Museum possesses one from Putla, Mexico. 8. SCELOPORUS SERRIFER. Sceloporus serrifer, Cope, Proc. Ac. Philad. 1866, p. 124, and Proc. A m . Philos. Soc. xxii. 1885, p. 395. The following is the original description of the species:-"A stout species, near the S. spinosus, but differing in its fewer and larger scales, wdth more serrate margins, and in its coloration. It belongs therefore to the section with large lateral scales and only one row of large supraorbitals. In this species the latter are bounded by a complete series of inner and outer marginals. Scales from nape to rump in 23 cross series, each with a long mucro, and two and three lesser ones on each side of it. Interparietal broader than long; frontal narrow, only transversely divided, posterior portion very small. Internasal longer than broad, elevated, sometimes sharply keeled. Lores deeply grooved. Claws of extended hind limb nearly to ear ; femoral pores 9-10. Auricular marginal scales thin, not so large as those just preceding. Median abdominal scales once, gulars twice or thrice emarginate. Tail rather short. Length of end of muzzle to vent, 4 in. 1 1. Colour above greyish or brighter green, with a complete pea-green bordered black collar, which is narrower on the gular region. Throat and sides of male blue, the latter broadly black-bordered behind and medially. A yellow bar across praefrontals, one between orbits and one across occiput, all separated by brown or blackish, the posterior green-bordered behind. Younger specimens have the back brown, cross-banded." Yucatan. To this description Cope has added a few notes in 1885 :- " Of four adult specimens, three have tbe collar interrupted, and oue has it continuous over the nape. In three young specimens the collar is uninterrupted. In none of the adults are there more than ten femoral pores." A single female specimen, from Mexico, which I have referred to S. serrifer, perhaps belongs to a distinct species, as suspected by Giinther. It has 35 scales between the interparietal shield and the base of tbe tail, 10 corresponding to the length of the shielded part of the head. Tibia as long as the shielded part of the head ; the distance between the base of the fifth toe aud the extremity of the fourth equals the distance between the nostril and the arm. 10-11 femoral pores. Olive above, brown-spotted ; a dark brown nuchal collar, interrupted in the middle. Erom snout to vent 72 millim. 9. SCELOPORUS ORCUTTI. Sceloporus orcutti, Stejneger, N . Amer. Eaun. no. 7,1893, p. 181, pl. i. fig. 4. Head-shields smooth; frontal transversely divided, in contact |