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Show 1 9 0 5 .] NEW MEXICAN REPTILES. 2 4 7 green ; limbs with rather indistinct dark bars; throat and belly dark blue; a narrow whitish median ventral streak. Total length....... 147 millim. Fore limb....... 32 millim. Head................... 15 ,, Hind limb ... 45 ,, Width of head... 11 „ Tail ............... 80 „ Body................... 52 „ Two male specimens from a ravine near Mesquititlan, north of Chilpancingo, Guerrero. This very remarkable species, which I take the liberty of naming after Mrs. Gadow, agrees with S . pyrrliocephalus Cope, in its distinctly compressed tail, but differs from it in having much smaller scales and more numerous femoral pores. No species of Sceloporus was hitherto known to have more than 25 femoral pores on each side. L e p tod ir a g u il l e n i . (Plate VII. fig. 2.) Rostral twice and a half as broad as deep, scarcely visible from above; internasals a little longer than broad, little shorter than the prsefrontals; frontal once and two-thirds as long as broad, a little longer than its distance from the end of the snout, a little shorter than the parietals; loreal as long as deep ; one prseocular, well separated from the frontal; two postoculars; a subocular below the prseocular and another below the postoculars ; temporals 1 + 2 ; eight upper labials, fourth and fifth entering the eye; five lower labials in contact with the anterior chin-shields, which are much shorter than the posterior. Scales in 23 rows. Ventrals 189; anal divided; subcaudals 71. Above with eleven dark brown areas separated by narrow greyish-white bands; snout,, interocular region, and temples brown, back of head and nape bright red with a dark brown median line; a light, dark-edged streak along the upper lip; lower parts white, the ventrals with a brown spot on each side ; subcaudals brown, edged with whitish. Total length 530 millim.; tail 110. A single female specimen from the Rio Balsas, Guerrero. This species which, on the whole, is intermediate between L . nigrofascicita Gthr. and L . personata Cope, is named after Senor Don Manuel Guillen, Governer of the State of Guerrero, in recognition of valuable assistance rendered to Dr. Gadow. EXPLANATION OP THE PLATES. P l a t e V I. Fig. 1. Anolis gadovii, sp. n., p. 245. la. „ „ Upper view of head, X2. 2. „ liogaster, sp. n., p. 245. 2 a. „ „ Upper view o f head, X2J. P l a t e VII. Fig. 1. Sceloporus gadovice, sp. n., p. 246. Upper and lower views. 1 a. „ ' „ Upper view o f head, X 2.y. 1 J. „ „ Side view o f head, X 2£. 2. Leptodira guilleni, sp. n., p. 247. Upper and side views o f head and anterior part o f body. |