24 



BULLETIN 154, UNITED STATES NATIONAL MUSEUM 



17. Dorsal stripes often iiulistiiict, usually wavy, and of lesser intensity than 



the lateral stripes; j-ellowish mitldorsal streak often present 18. 



Dorsal stripes distinct, straight, and of same intensity as lateral stripes; 

 yellowiS'h niiddorsal streak absent. 



C. sexlineatus perplexus (Baird and Girard), p. 122. 

 (Utah and Colorado, south through Arizona, New Mexico, and western 

 Texas into northern Mexico.) 



Fkujue 4. — Cnemidophorus tessella- 

 tus kubidus. gular region a, an- 

 terior mental ; b, posterior mental 

 (postnasal) ; c, sublabial ; d, 

 patch of enlarged central scales ; 

 e, anterior gulars ; f, posterior 

 gulars ; g, region of anterior 

 gular fold ; //, mesnptychium (re- 

 gion between anterior and pos- 

 terior gular folds) ; i, region of 

 posterior gular fold with post- 

 mesopti'chial granules extending 

 over edge ; j, large ventral scutes 



Figure 5. — Cnemidophorus sex- 

 lineatus GULARIS. MESOPTYCHIAL 

 REGION SHOWING LARGE SCALES ON 

 THE EDGE OF THE POSTERIOR GULAR 



FOLD. Note differences from C. 



TESSELLATUS RUBIDUS (FIG. 4). .4^ 

 PLATES AT EDGE OF LARGE POS- 

 TERIOR MESOPTYCHIAL (GULAR) 

 FOLD ; B. POSTMESOPTYCHIAL GRAN- 

 ULES ; V, LARGE VENTRAL SCUTES 



IS. \'«'ntral surfaces |ti-c(l(iniinaiitly light in cohn' (unh'ss stained). 



C. sexlineatus sexlineatus (Linnaeus), p. 76. 

 (Eastern coastal plain from New Jerse.\ to Flm'ida ; also, the Mississippi 

 Valley northward to Wisconsin and west to llio Rocky Mountains.) 

 Vcnti'al surfaces suffu.sed with nuuh dark bluish, particularily in the 

 Ihoi-acie and abdominal regions. 



C. sexlineatus gularis (Baird and Girard), p. 97. 

 (Okbxhonia, Texas, central Chihuahua and Sinaloa, south to Guatemala.) 



