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Show 1897.] LIZARDS OF THE GENUS SCELOPORUS. 487 U.S. Geol. Surv. Montana, p. 468 (1.872); Yarrow, in Wheeler's Eep. Explor. W . 100th Mer. v. p. 574 (1875); Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 395; Bouleng. Cat. Liz. ii. p. 229 (1885); Giinth. Biol. C.-Am., Eept. p. 69(1890); VauDenburgh, Proc. Cal. Ac. (2) v. 1895, p. 113. Sceloporus tristlchus, Cope, in Wheeler's Eep. Explor. W . 100th Mer. v. p. 571. Sceloporus garmanl, Bouleng. Proc. Zool. Soc. 1882, p. 761, pl. lvi. Head-shields smooth; 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 longer than broad, larger than the parietals ; a series of four or five transversely enlarged supraoculars, the widest not measuring more than half the width of the supraocular region, bordered inwards by one series of scales and separated from the supraciliaries by two or three; two canthal scales ; three to five pointed scales, longer than those in front of them, form a denticulation on the anterior border of the ear. Dorsal scales much larger than ventrals, as long as broad, strongly keeled, slightly mucronate, tricuspid, the keels forming-parallel lines ; 38-47 scales between the interparietal shield and the base of the tail; 7 to 10 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, keeled, pointing upwards and backwards. Ventral scales smooth, bi- or tricuspid. 42-46 scales round the middle of the body. The adpressed hind limb reaches the axilla or the cervical fold ; tibia slightly 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 posterior border of the ear. 12-18 femoral pores on each side. Caudal scales as large as or a little larger than dorsals, strongly keeled and shortly mucronate. Males wdth enlarged postanal scales. d-Dakota. Garman 5 1. 57 64 64 2. 12 12 12 3. 13 13 13 4. 11 11 11 5. 14 13-5 13 6. 42 43 41 7. 9 9 9 8. J 9. 42 46 44 13-12 15-14 12-12 Eeddish brown above, with a greyish vertebral band and one or two yellowish lateral bands on each side; dark brown spots between the longitudinal bands; a blackish streak at base of humerus. Lower parts yellowish white, uniform in the female ; male with a small blue spot on each side of the throat, and an elongate black-margined blue blotch on each side of the belly, the white interspace between them measuring twice their width. Hab. This species was originally described from the Eed Eiver |