10. VTA 211 



Remarks. Ufa levis was originally described from two 

 specimens collected at Tierra Amarilla, Rio Arriba County, 

 New Mexico. Tree Utas from Colorado and Utah seem 

 to differ from those from Arizona in having the tubercles 

 on the dorsolateral line much reduced, the large dorsals 

 usually less strongly keeled and beginning usually behind 

 a line joining the insertions of the forelimbs, and the absence 

 of elongate tubercles on the sides of the neck. In a good 

 series of specimens from Thompson, Utah, great individual 

 variation is shown. The large dorsals may be strongly 

 keeled, weakly keeled or nearly smooth. The enlarged 

 scales on the dorsolateral line may be quite evident, or may 

 be absent anteriorly and almost lacking posteriorly. Similar 

 variation occurs in the caudal scales. I, therefore, regard 

 Ufa levis and Ufa wrighti as synonyms. Colorado speci- 

 mens apparently belong to the same form. 



Distribution. The Rocky Mountain Tree Uta, if the 

 views stated above are correct, i.s known from northern New 

 Mexico, Colorado, and eastern Utah. 



In Utah, it has been collected at Thompson, Grand 

 County, and at Grand Gulch, San Juan County, at an alti- 

 tude of 4,000 to 5,000 feet. Yarrow recorded a "Uta or- 

 nata" as collected in "Central Utah." 



