70 CALIFORNIA ACADEMY OF SCIENCES. 



of limbs provided with keeled scales. Femoral pores 

 about ten to twelve in number on each thigh. Tail 

 more than twice as long as head and body. 



The general color above is grayish, becoming darker 

 on the sides and slightly tinged with yellow on the snout. 

 On the back are rather indistinct, wide, blackish cross- 

 bars, which are often interrupted on the vertebral line 

 and sometimes alternate. The tail is grayish with faint 

 narrow rings of brown or slate. The limbs are cross- 

 barred with dusky above. The lower surfaces are 

 silvery white more or less flecked with black or slate. 

 Males have a yellow patch on the throat and a long blue 

 area on each side of the belly. 



Length to anus 33 



Length of tail 75 



Snout to orbit 3 



Snout to ear 8 



"Width of head 6 



Fore limb 12 



Hind limb 22 



Base of fifth to end of fourth toe 9 



Distribution. — This lizard has been found only along 

 the Colorado River. At Fort Yuma and The Needles, 

 California, it is very rare and lives on or near the 

 willows and mesquites, never on the open desert. In 

 Nevada, it has been taken at Bunkerville, and at Call- 

 ville, Lincoln County. 



17. — Uta symmetrica Baird. Tree Uta. 



Uta symmetrica, Baird, Proc. Acad. Nat. Sci. Phila., 1858, p. 253 



(type locality Fort Yuma, Cal. ). 

 ? Uta schottii, Baird, 1. c, p. 253 (type locality Sta. Madelina, 



CaL). 



Description. — Head and body considerably depressed. 

 Snout rounded but rather narrow, with well developed 

 canthi above which the nostrils open much nearer to 



