CROCODILTANS, LIZARDS, AND SNAKES, 325 



surfaces of tlio tliighs and the posterior surfaces of the arms are finely granular. 

 The other portions of the limbs are covered with scales, which are smooth on the ven- 

 tral surfaces of the thighs, legs, arms, and forearms, but keeled elsewhere. Scales 

 on ventral parts of body smooth. Scales on back of tail much larger than those 

 below, both strongly keeled. Femoral pores, fourteen on the left side, thirteen on 

 the right. Enlarged postanal plates present. 



Color sooty black, slightly paler below. Back with a few irregularly scattered 

 light spots, and with nine pairs of faintly marked vertebral bars of a deeper black. 

 Chest and belly indigo; chin and throat azure; pre- and post-anal regions' tinged 

 with azure. 



Length of head aud body, 45 mm ; of tail, 84 mm. ; of hind leg, 31 mm. ; of 

 fore leg, 21 mm. ; of hind foot, 13 ram. ; of shielded part of head, 10 mm. ; of head to 

 posterior border of ear, 11 mm. Depth of head, 6 mm. ; its greatest width, 8 mm. 



Adult male (Type, No. 1221, Leland Stanford Junior University Museum, collected 

 by J. M. Stowell, in the San Pedro Martir Mountains, Lower California, June 20 or 21, 

 1893). 



Adult female (No. 1222, Leland Stanford Junior University Museum, collected by 

 J. M. Stowell in the San Pedro Martir Mountains, Lower California, June 20 or 21, 

 1893). Differs from male in having thirty-two instead of thirty-four dorsal scales 

 equal to the shielded part of head, and in having fifteen femoral pores. The general 

 color is slaty gray, almost white below. Back with dark markings, as in male. A 

 gular patch of lemon yellow. 



This species approximates Section C of the genus in the increased 

 number and smaller size of the dorsal scales. The larger dorsal scales 

 are, however, far less numerous than in U. stanshuriana and U.palmerii, 

 there being only eight to fourteen rows, as compared with twice as 

 many in the latter. The blue colors also ally it to Section D. 



The name applied to this species by Mr. Van Denburgh being a 

 hybrid, I am compelled to modify it so as to express what the discov- 

 erer and namer of the species intended to express. 



UTA GRACIOSA Hallowell. 



Utagraciosa Baird, U. S. Mex. Bound. Surv., Reptiles, 1859, p, 7; Proo. Acad. 



Nat. Sci. Phila., 1854, p. 92.— Boulenger, Cat. Liz. Brit. Mus., 2d ed., II, 



1885, p. 213. 

 Urosaurus gractosus Hallowell, Proc. Acad. Nat. Sci. Phila., VII, June, 1854, 



p. 92; Rept. U. S. Expl. Siirv. Pacific R. R., X, Pt. 4, 1859, p. 4, pi. vii, fig. 1. 



About one-third the body and head very slender; excessively elon- 

 gated tail. Head depressed, rather broader than deep; additional 

 plates on the rostrum. Large dorsal scales in about six quite regular 

 and equal series, not embracing much smaller ones. 



Color above light ashy gray, Avith sometimes a reddish tinge. On 

 each side a series of narrow, transverse, dusky bars, sometimes widen- 

 ing above; a more distinct band on each side the neck. Beneatli white, 

 veined with short, mottled, grayish lines. Male with the sides of belly 

 blue, spotted with whitisli. 



The body of this species is very slender, the tail much elongated and 

 greatly attenuated, being about ten and a half times the head and body. 

 This is cylindrical at base, but soon becomes decidedly compressed, 

 the section being vertically elliptical to near the tip, where it is more 

 rounded again. 



