18. CNEMIDOPHORUS 497 



was described as a new species, C. arlzonce, and its dis- 

 tinguishing characters were tabulated as follows : 



C. labialis C. anzoncs 



Two large preanals Three large preanals. 



Frontal very narrow behind. Frontal not unusually narrow 



behind. 



Gular and collar scales Gular and collar scales 



smaller. larger. 

 Postantebrachials not en- Postantebrachials slightly en- 

 larged, larged. 

 Limbs longitudinally striped. Limbs unicolor. 

 Tail with distinct color bands. Tail without distinct color 



bands. 



A wider indefinite median A narrow w e 1 1-def ined 



dorsal line. median dorsal line. 



I recently secured from El Paso, Texas, two specimens 

 of Cnemidophorits -perplexus. One of these specimens has 

 the anterior nasal in contact with the second labial. As both 

 specimens seem to agree with C. arizome in all other respects, 

 this name may now be regarded as a synonym of C. -per- 

 plexus. 



103. Cnemidophorus disparilis Dickerson 

 TiBURON Island Whiptail Lizard 



Cnemidophorus disparilis Dickerson, Bull. Amer. Mus. Nat. Hist., 

 Vol. 41, 1919, p. 473 (part) (type locality, Tiburon Island, Gulf 

 of California, Mexico); Nelson, Mem. Nat. Acad. Sci., Vol. 

 XVI, 1921, p. 171. 



The following is the original description of this lizard, 

 omitting the coloration of the young which represent another 

 species. 



"Diagnosis. — Of medium size; with fine and uniform 

 dorsal scutellation, abdominal ventrals in eight longitudinal 



