254 



REPORT OF NATIONAL MUSEUM, 1898. 



The Crotaphytus collaris ranges from southern Missouri throuj^h ceu- 

 tral Kansas to northern Nevada as its northern hmit; to Texas, as far as 

 the mouth of the Rio Grande; to the city of Chihuahua and to south- 

 eastern California, to the Sierra Nevada, beyond which it has not yet 

 been found. Stejneger,^ remarks as to its distribution in this direc- 

 tion: 



In spite of tbe fact that this species, in certain localities at least, ascends the 

 mountains as high as 5,600 feet, it does not occur anywhere within the interior valley 

 of California, nor does it pass heyond the San Bernardino range; in fjict, it does not 

 seem to reach the coast anywhere; it is evidently an inland desert form. 



CROTAPHYTUS RETICULATUS Baird. 



Crotaphytus reiiculatus Baihd, Proc. Acad. Nat. Sci. Phila., 1858, j). 253.- 

 GER, Cat. Liz. Brit. Mus., II, 1885, p. 203. 



-BOULKN- 



Fig. 20. 



Crotaphytus keticulatus Baird. 



X 2. 



Ringgold Barracks, Texas. 



Cat. No. 2692, U.S.N.M. 



External characters those of G. collaris as to width of head, large 

 size of plates, division of suborbitals into a series of or 8 nearly e(]|ual 

 plates. The scales on the chin and throat, however, are much smaller, 

 those on the gular fold scarcely imbricated, and considerably less than 

 those between the fore legs, instead of the same size, as in C. collaris 

 and icislizemi. Scales on the inferior surface of legs carinated; 

 mucronate rather smaller than in C. collaris. Scales of the head, and 

 especially those on the border of the auditory meatus, less tubercular 

 than in C. collaris; hence no serrate on border. 



General color in spirits, brownish gray; entire upj)er and outer sur- 

 faces of head, body, limbs, and tail covered by a network of light ash. 



North .American- Fauna, Xo. 7, 1893, p. 165. 



