8. CALLISAURUS 145 



the sandy areas back of the beaches. In the interior, it was 

 found in the hot sandy bottoms of the canyons and adjacent 

 arroyos. North of the Cape Region it is replaced by C. d. 

 carmenensis. 



23. Callisaurus draconoides carmenensis (Dickerson) 

 LOWER CALIFORNIA GRIDIRON-TAILED LIZARD 



? Callisaurus dracontoidcs gabbii COPE, Bull. U. S. Nat. Mus., No. 1, 

 1875, p. 47; YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, pp. 9, 

 189; COPE, Report U. S. Nat. Mus. or 1898, 1900, p. 272 (type 

 locality, northern Lower California, Mexico). 



? Callisaurus dracontoides LOCKINGTON, Amer. Naturalist, Vol. XIV, 

 1880, p. 295 ; COPE, Proc. U. S. Nat. Mus., Vol. XII, 1889, p. 147; 

 TOWNSEND, Proc. U. S. Nat. Mus., Vol. 13, 1890, p. 144 (part). 



Callisaurus vcntralis VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. V, 

 1895, p. 97 (part). 



Callisaurus draconoides MOCQUARD, Nouv. Arch. Mus. Hist. Nat., Paris, 

 Ser. 4, Vol. I, 1899, p. 305. 



Callisaurus carmenensis DICKERSON, Bull. Amer. Mus. Nat. Hist., Vol. 

 XLL, 1919, p. 465 (type locality, Carmen Island, Gulf of 

 California, Mexico) ; NELSON, Mem. Nat. Acad. Sci., Vol. XVI, 

 1921, pp. 114, 115, 171. 



Callisaurus plasticus DICKERSON, Bull. Amer. Mus. Nat. Hist., Vol. XLI, 

 1919, p. 466 (type locality, Agua Verde Bay, Lower Cali- 

 fornia, Mexico); NELSON, Mem. Nat. Acad. Sci., Vol. XVI, 

 1921, pp. 114, 115, 171. 



Callisaurus ventralis vcntralis VAN DENBURGH & SLEVIN, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. XI, 1921, p. 57. 



Description. Head rather short and low, with well 

 developed canthus rostralis. Nostrils large, opening on 

 upper surface of snout. Supraocular regions covered with 

 small plates and separated from each other by one or two 

 rows of slightly larger plates. Upper head plates (except 

 interparietal) small and irregular, largest on frontal and 

 pref rontal regions, everywhere smooth and rather flat. Sev- 



