10. UTA 20£ 



ish, sometimes paler on the head and the base of the tail, 

 crossed by from six to eight bars of black or brown. These 

 cross-bars may be very indistinct, usually are interrupted on 

 the middle of the back, and sometimes alternating with 

 those on the opposite side. The light edgings of the dorsal 

 bars may be present, either blue or yellowish. The tail is 

 blackish or bluish sometimes indistinctly ringed with dusky 

 or tinged with ochraceous. The lower surfaces are white 

 or blue, more or less dotted or suffused with dark brown 

 or black. Males usually have an intense blue patch on 

 each side of the belly and an area of lemon yellow, which 

 sometimes acquires a tinge of orange, on the center of the 

 throat. 



Length to anus +3 



Length of tail 78 



Gular fold to anus 29 



Snout to ear 9 



Width of head 7 



Fore limb 15 



Hind limb 28 



Base of fifth to end of fourth toe -12 



Distribution. — This lizard originally was described from 

 specimens from Las Tres Marias Islands and Presidio, 

 Sinaloa, Mexico, and probably was later described by 

 Cragin from specimens collected at Guaymas, Sonora. 

 Specimens are now at hand from Tiburon Island, in the 

 Gulf of California. 



Remarks. — Some of these specimens have two rows of 

 enlarged scales anteriorly, although those of the outer row 

 are of much smaller size than those of the inner enlarged 

 row. A few specimens from Arizona are so similar in the 

 size and arrangement of their large dorsals that it seems 

 necessary to consider the Mexican form a subspecies of 

 U. ornata. 



