17. XANTUSIA 477 



c'. — A pair of frontals, eye small. 



X. gilberti. — p. 482. 

 b'. — Ventral plates in 14 longitudinal series. 



X. henshawi. — p. 484. 

 a.' — Two series of small plates (superciliaries and supra- 

 oculars) over eye. Ventral plates in 16 longitudinal 

 series. 



X. riversiana. — p. 486. 



98. Xantusia vigilis Baird 



Desert Night Lizard 



Plate 49 



Xantusia vigilis Baird, Proc. Acad. Nat. Sci. Phila., 1858, p. 255 (type 

 locality, Fort Tejon, California); Cooper, Proc. Cal. .Acad. Sci., 

 Vol. IV, 1870, p. 71; Cope, Bull, U. S. Nat. Mus., No. i, 1875, p. 45; 

 Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 42; Boulenger, 

 Cat. Lizards Brit. Mus., Vol. II, 1885, p. 327; Stejneger, N. Amer. 

 Fauna, No. 7, 1893, p. 198, pi. Ill, figs. la-lc; Van Denburgh, 

 Proc. Cal. Acad. Sci., Ser. 2, Vol. V, 1895, p. 523; Van Denburgh, 

 Occas. Papers Cal. Acad. Sci., V, 1897, P- 123; Cope, Report U. S. 

 Nat. Mus. for 1898, 1900, p. 545, fig. 97; Meek, Field Columb. Mus., 

 Zool. Ser., Vol. VII, No. i, 1906, p. 13; Grinnell & Grinnell, 

 Throop Inst. Bull., No. XXXV, 1907, p. 57, fig. 23; Ditmars, 

 Reptile Book, 1907, p. 179; Camp, Univ. Cal. Publ. Zool., Vol. 12, 

 No. 17, 1916, p. 528; HuBBS, Copeia, No. 32, 1916, p. 52; Grinnell 

 & Camp, Univ. Cal. Publ. Zool., Vol. 17, No. 10, 1917, p. 171 ; Stej- 

 neger & Barbour, Check List N. Amer. Amph. Rept., 1917, p. 64; 

 Cowles, Journ. Entomol. & Zool., Pomona College, Vol. XII, No. 3, 

 1920, p. 65; Stephens, Trans. San Diego Soc. Nat. Hist., Vol. Ill, 

 No. 4, 1921, p. 62; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., 

 Ser. 4, Vol. XI, 1921, pp. 28, 51. 



Description. — Body nearly cylindrical, with very short 

 limbs. Upper surface of head flattened, curving towards 

 snout. Three folds on throat, anterior connecting ears and 

 encircling head. Nostril opening at junction of rostral, in- 

 ternasal, postnasal, and first labial plates. Rostral in con- 

 tact with first labial and internasal plates. Two internasals 



