104 3. IGUANID.^ 



Genus 6. Crotaphytus 



Crotafkytus Holbrook, N. Amer. Herpetology, Ed. 2, Vol. II, 1842, 

 p. 79 (type, coUaris). 



The head and body are somewhat depressed, and much 

 shorter than the tapering tail. All of the head plates are 

 small. The labials not imbricate. The ear -opening is 

 large, without strong denticulation. The dorsal scales are 

 small and nearly uniform. Long series of femoral pores 

 and one or more transverse gular folds are present. There 

 are no spinose tubercles on the neck, and no dorsal crest. 

 The superciliaries are imbricate. Males have enlarged 

 postanal plates. 



Synopsis of Species 

 2 . — One or two black bars across the shoulders, 

 b. — Collar of two barsj snout shorter, 



C. collaris baileyi. — p. 104. 



b'. — Collar a single bar; snout longer. 



C. insularis. — p. 1 1 4. 



a'. — No black bars across the shoulders, 

 bb. — Greatest width of head less than distance between 

 the nostril and ear-opening. 



C. wislizenii.- — p. 116. 



bb'. — Greatest width of head equal to or greater than 

 distance between the nostril and ear-opening. 

 C. silus. — p. 128. 



16. Crotaphytus collaris baileyi (Stejneger) 

 Western Collared Lizard 



Plate 7 



Crotafhytus collaris Baird, U. S. Mex. Bound. Surv., Vol. II, 1859, 

 Rept., p. 6; Baird, Rep. P.ic. R. R. Surv., Vol. X, 1859, p. 17; 

 Baird, Rep. Pac. R. R. Surv., Vol. X, Ft. VI, No. 4, 1859, p. 37; 

 Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 302; Cope, Bull. 

 U. S. Nat. Mus., No. 1, 1875, p. 47 (part); Yarrow, Surv. W, 



