107. Scales of back equal or blending in size 108. 

 With lengthwise rows of raised or enlarged scales dorsally or with dor' 



solateral folds 109. 



108. Scales of back small, smooth; back with light spots and dark cross bands 



which tend to extend on to the belly; S. Cal. 



Streptosaurus mearnsi (Stejneger) Banded Swift 

 (Uta mearnsi Stejneger) 

 Scales of back keeled, larger than lateral scales; back with light spots 

 and often with faint, light, lengthwise stripes; Wash, to Cal. and 

 Texas 



Uta stanshiiYTana B. & G. Ground Swift 

 (and subspecies) 



109. Frontal plate entire; scales along center of back all small (between a 



raised dorsolateral line on each side) ; Cal. 



Urosaurus microscutatus (Van Dcnburgh) Small-scaled Swift 



Frontal plate divided; scales of back (between dorsolateral ridges) in 



large and small lengthwise series (U. ornatus — six of the eight sub' 



species are given here) 110. 



110. Tail very long, twice as long as head and body; with several nearly 



equal rows of enlarged scales down middle of back; Nevada, Ariz, and 

 Cal. 



Urosaurus ornatus graciosus Hallowell Long-tailed Swift 

 (Uta graciosa (Hallowell) ) 

 Tail shorter; with a mid-dorsal series of very small scales, bordered on 

 each side by two to four lengthwise rows of larger scales 111. 



111. Dorsolateral folds absent or almost so; large dorsal scales scarcely keeled; 



N.M. 



Urosaurus ornatus levis (Stejneger) Olive Swift 

 With distinct dorsolateral folds or with some large dorsal scales well 

 keeled, or both 112. 



112. With two fairly regular rows of large dorsal scales on each side of the 



small mid-dorsal series; scales of sides in parallel, diagonal rows 113. 



Large dorsal scales more irregularly arranged or in more rows; scales of 



sides not in regular, diagonal series 114. 



113. Mid-dorsal series of small scales wider than any individual large, dorsal 



scale; Cal. and Ariz. 



Urosaurus ornatus symmetricus (Baird) Symmetrical Swift 

 Mid-dorsal series of small scales narrower; Ariz, and N. M. 

 Urosaurus ornatus linearis (Baird) Lined Swift 



114. Usually with one to two irregular rows of large scales on each side of 



the small mid-dorsal series; usually with a fold of skin along each side 

 below the dorsolateral fold; Texas 



Urosaurus ornatus ornatus (B. ^ G.) Common Ornate Swift 

 Usually with two to three irregular rows of large scales on each side of 

 the small mid-dorsal series; sides fairly smooth below the dorsolateral 

 folds; Utah, Colo., Ariz, and N. M. 



Urosaurus ornatus u'righti (Schmidt) Wright's Ornate Swift 

 {Uta wrighti Schmidt) 



379 



