118 3. IGUANIDM 



Van Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 



1921, pp. 28, 31, 40, 42, 51 ; Nelson, Mem. Nat. Acad. Sci., Vol. 



XVI, 1921, p. 114. 

 Crotafhytus Gambelii Baird & Girard, Proc. Acad. Nat. Sci. Phila., 



Vol. VI, 1852, p. 126 (type locality, California) ; Baird & Girard, 



Marcy's Explor. Red River, 1854, p. 205. 

 CrotafAyttii fasciatus Hallowell, Proc. Acad. Nat. Sci. Phila., 1852, 



p. 206 (type locality, Jornado del Muerte, New Mexico) ; 



Hallowell, Sitgreaves' Exped. Zuiii &: Colorado Rivers, 1853, 



p. 115, pi. V; Heermann, Rept. Pac. R. R. Surv., Vol. X, 1859, 



p. 24. 

 Leiosaurus hallowelli Dumeril, Arch. Mus. Hist. Nat., Vol. VII, p. 5 3 3, 

 Crotaphyttis cofeii Yarrow, Proc. U. S. Nat. Mus., 1882, p. 441 (type 



locality. La Paz, Lower California); Yarrow, Bull. U. S. Nat. 



Mus., No. 24, 1883; p. 53; Stejneger, N. Amer. Fauna, No. 3, 



1890, p. 105; Van Denburgh, Proc, Cal. Acad. Sci., Ser. 2, Vol. 5, 



1895, p. 93; Dickerson, Copeia, 1917, No. 50, p. 96; Nelson, 



Mem. Nat. Acad. Sci., Vol. XVI, 1921, pp. 114, 115. 

 Crotaf/iytus cofii Garman, Bull. Essex Inst., Vol. XVI, No. 1, 1884, 



p. 16. 

 Crotafhytus cofei Cope, Bull. U. S. Nat. Mus., No. 32, 1887, p. 45; 



Belding, West Amer. Scientist, Vol. Ill, No. 24, p. 97. 

 Crotaphytui silus McLain, Critical Notes, 1889, p. 2 (part). 

 Crotaphytus fasciatus Mocquard, Nouv. Arch, du Mus. d'Hist. Nat. 



P.aris, Ser. 4, Vol. I, 1899, p. 303, pi. XIII, fig. 1 (type locality, 



Las Palmas, Lower California). 

 Crotaphytus fasciolatus Mocquard, Bull. Mus. Hist. Nat. Paris, 1903, 



p. 209 (new name for C fasciatus). 



Description. — Head large, depressed, not so distinct 

 from neck as in C. c. baileyi. Its plates all small, but largest 

 and somewhat convex on snout. Three to five longitudinal 

 rows of shields separating supraocular regions. Nostril 

 large and opening laterally in a round plate much nearer to 

 end of snout than to orbit. Superciliaries small but im- 

 bricate. Rostral plate wide but very low. Supralabials of 

 nearly equal size. A long subocular plate. Ear-opening 

 large, oblique, with very slight anterior denticulation. Supra- 



