CROCODILIANS, LIZARDS, AND SNAKES. 



255 



the meshes quite regularly hexagonal, covering eight to twelve scales 

 in width, and here and there abruptly dark brown, instead of the pale 

 ground color. The chin with somewhat similar reticulati(ms in one 

 specimen, in another the web coarser. The rest of the under parts 

 throughout are yellowish. In a female specimen with inconspicuous 

 femoral pores there is no trace of a collar on the neck as in collaris. 

 In a male with the pores very large and black there is a dull blackish 

 collar on the throat passing around the sides of the neck, but inter- 

 rnpted above the middle of throat is bluish. There are no indications 

 whatever of white spots, as in collaris. 



This species is quite similar in form to the C. collaris, but differs in 

 the smaller gular and less prominent auricular scales. Its coloration 

 is entirely different, lacking the double interrupted collar on the neck 

 and the white spots. Any approach to the reticulation described is 

 never seen iu collaris, except in very young specimens, and then much 

 more irregular and combined with transverse light bands not found in 

 reticulatus. 



This handsome species continues rare, the four specimens below 

 mentioned being the only ones that have come under my observation. 



CrotaphytuH reticulatus Baird, 



CROTAPHYTUS WISLIZENII Baird and Girard. 



Crotaphytus wislizenii Baird and Girard, Proc. Acad. Nat. Sci. Phila., VI, April, 

 1852, p. 69 (New Mexico); Stansbury Kept. G. Salt Lake, 1852, p. 340, 

 pi. Ill, and in Mex. Bound. Surv. Eept., 1859, p. 7, pi. xxxi. — Bocourt, 

 Miss. Sc. Mex. Rept., 1874, p. 155, pi. xvii bis., fig. 4. — Boulenger, Cat. Liz. 

 Brit. Mus., II, 1885, p. 204. 



Crotaphytus gambelU Baird and Girard, Proc. Acad. Nat. Sci. Phila., VI, August, 

 1852, p. 126. 



Crotaphytus fasciatus Hallowell, Proc. Acad. Nat. Sci. Phila., VI, December, 

 1852, p. 206; Sitgreaves Rept. Znfii, 1853, p. 115, pi. v (same description as 

 preceding). 



Leiosaurns lialJowelHi Aug. Dum^ril, Arch. Mus., VIII, 1856, p. 533, note 1. 



Crotaphytus copci Yarrow, Proc. U. S. Nat. Mus., V, 1882, p. 441. 



Crotaphytus silus Ste.ineger, North American Fauna, No. 3, 1890, p. 105; No. 7, 

 Pt. 2, 1895, p. 170. 



Head narrow; its width scarcely two-thirds the distance from snout 

 to ear. Supraorbital x)lates only moderately smaller than those in the 

 middle and front of head. Of these plates there are three or four series 

 between the middle of the orbit and eleven or twelve between their 

 anterior extremities. Infraorbital chain composed of one long i)late, 

 and one or two short ones at either end, about eight between the nos- 



