516 8. TEIIDJE 



alternate strokes, it would rest one foot while making a 

 number of backward strokes with the other. After a short 

 time it reverted to the way of digging first described. 



"When the burrow was well under way and the exca- 

 vated sand began piling up, the lizard turned around in the 

 depression 5 began slowly crawling outward, and, instead of 

 scooping aside the sand, pushed it back with the face of its 

 hands. Then re-entering the burrow, it resumed its digging, 

 using the method already described. 



"It continued burrowing until its movements were again 

 interfered with by the accumulating sand, which it would 

 once more push out. This process of digging was continued 

 until the burrow was finished. The lizard then, with its 

 head facing outward, assumed a resting position at the end 

 of the excavation." 



108. Cnemidophorus tessellatus mundus (Camp) 

 California Whiptail Lizard 



Cnemidophorus undulatus Hallowell, Proc. Acad. Nat. Sci. Phila., 

 VII, 1854; p. 94 (type locality, "Fort Yuma, San Joaquin Val- 

 ley") = [Fort Miller, Fresno County, California]; Hallowell, 

 Kept. U. S. Pac. R. R. Surv., Vol. X, Pt. IV, 1859, p. 8, pi. IX, 

 fig. 2. 



Cnemidophorus tesselJatus tigris Yarrow, Bull. U. S. Nat. Mus., No. 24, 

 1883, p. 4S (part). 



Cnemidophorus tigris undulatus Stejneger, N. Amer. Fauna, No. 7, 

 1893, p. 200; Van Denburgh, Occas. Papers Cal. Acad Sci., V 

 1897, p. 137; McLain, Critical Notes, 1899, p. 9. 



Cnemidophorus tessellatus tessellatus Cope, Report U. S. Nat. Mus. for 

 1898 (1900), p. 575 (part). 



Cnemidophorus tigris mundus Camp, Univ. Cal. Publ. Zool., Vol. 17, 

 No. 7, 1 91 6, p. 71 (substitute name for C. undulatus Hallowell 

 preoccupied); Grinnell & Camp, Univ. Cal. Publ. Zool., Vol. 17, 

 No. 10, 1917, p. 173. 



Cnemidophorus tessellatus mundus Stejneger & Barbour, Check List 

 N. Amer. Amph. Rept., 1917, p. 68. 



