134 CALIFORNIA ACADEMY OF SCIENCES. 



b. — Spots ou throat few and small; central gular and collar scales 

 smaller C. tigris undulatus. — p. 137. 



b''. — Spots on throat numerous and large, often forming irregular trans- 

 verse bands; central gular and collar scales larger. 



C. stejneg-eri. — p. 139. 



38. — Cnemidophorus tigris Baird & Girard. Desert 

 Whiptail. 



.? Ameiva tessellaia, Say, Long's Exped. Rocky Mts., 1823, II 

 (Philadelphia) p. 50 (London) p. 351, note 33 (type locality 

 Arkansas River near Castle Rock Creek*). 



Cnemidophorus tigris, Baird & Girard, Proc. Ac. Nat. Sci. Phila., 

 VI, 1852, p, 69 (type locality Valley of Great Salt Lake, 

 Utah); Baird & Girard, Stansbury's Report Gt. Salt Lake, 

 p. 338, pi. II; Baird, U. S. Mex. Bound. Surv., 1859, II, p. 10, 

 pi. XXXIII; Stejneger, N. A. Fauna, No. 7, 1893, p. 198. 



Cnemidophorus gracilis, Baird & Girard, Proc. Ac. Nat, Sci. Phila., 

 VI, 1852, p. 128 (type locality Desert of Colorado, Cal.); 

 Baird, U. S. Mex. Bound. Surv., 18,59, H, p. 10, pi. XXXIV, 

 figs. 7-14. 



Cnemidophorus tesselatus, Baird, Pac. RR. Surv., X, pt. IV, p. 18. 



Cnemidophorus lessellaius iesseUaius, Cope, Trans. Am. Philos. Soc. 

 (2), XVII, pt. 1, 1892, p. 34, pi. VII. 



Description. — Snout long, with nearly vertical sides. 

 Nostrils opening in large anterior nasal plates; latter in 

 contact on top of snout. Posterior nasal forming 

 sutures with anterior nasal, first, second and third 

 labials, loreal, prefrontal, and frontonasal plates. 

 Loreal in contact with third and fourth labials, first 

 subocular, preocular, first superciliary, prefrontal, 

 posterior nasal, and sometimes first supraocular plates. 

 Four supraoculars, first and fourth smaller than others. 

 Second, third, and fourth supraoculars separated from 

 superciliaries by small convex granules. Similar gran- 

 ules intrude between third and fourth supraoculars 

 and frontoparietal and parietal. Occcipitals represented 

 by from two to four transverse series of small plates 



* Colorado. 



