17. XANTUSIA 487 



for 1898, 1900, p. 550, fig. 99; VAN DENBURGH, Proc. Cal. Acad. 

 Sci., Scr. 3, Zool., IV, No. I, 1905, pp. 15, 16, 17, pi. V; DITMARS, 

 Reptile Book, 1907, p. 183; VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. 4, 1914, pp. 133, 137, 139; GRINNELL & 

 CAMP, Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 172; STEJ- 

 NEGER & BARBOUR, Check List N. Amer. Amph. Kept., 1917, p. 

 64; VAN DENBURGH, Copeia, No. 75, 1919, p. 91. 



Description. Limbs very short and body somewhat de- 

 pressed. Upper surface of head very flat. Nostril pierced 

 in a small scute at junction of rostral, internasal, postnasal, 

 and first labial plates. Rostral broad and rather low, 

 bounded by first labial, nasal, and internasal plates. Two 

 internasals followed by a large hexagonal frontonasal. Be- 

 hind this two prefrontals, bordered posteriorly by broad 

 frontal and first superciliary and first supraocular plates. 

 Each of two frontoparietal plates in contact with frontal, 

 second, third and fourth supraoculars, parietal, interparietal, 

 and its fellow of opposite side. Interparietal bordered be- 

 hind by two large occipitals. Latter separated from the 

 parietals by two small scutes. A row of large supratempo- 

 rals along outer edge of occipital and parietal plates. Two 

 loreals in contact below with supralabials, and above with 

 frontonasal and prefrontal plates. Eye surrounded by a 

 series of small plates, upper five of which are superciliaries. 

 Between this ring and posterior loreal, two or three small 

 plates. A series of four supraoculars separating supercil- 

 iaries from frontal and frontoparietal plates. Five superior 

 and four or five inferior labials to a point below pupil. 

 Eye large, without lids, and with vertical pupil. Ear 

 with a weak anterior denticulation. Inferior labials in con- 

 tact with large sublabials. First pair of latter in contact on 

 median line. Back, sides, upper and posterior surfaces of 

 Jimbs, and gular regions, covered with flattened granules. 

 A series of large plates along edge of last gular fold. Quad- 



