Reptiles 1 07 



only one such row. The Texas species has been found at Denver 

 and Trinidad, and appears to be wide spread but uncommon. 

 The Little Horned Lizard (P. modestum of Girard), without a 

 lateral abdominal fringe of elongate scales, and peculiar for hav- 

 ing the ear hidden under the skin, is doubtfully reported from 

 Custer County. As it is rather common in New Mexico, coming 

 at least as far north as San Ildefonso, it may be expected to occur 

 in Southern Colorado. 



Four genera with the more elongate form of the ordinary 

 lizards are Uta, Crotaphytus, Sceloporus and Holbroohia. In the 

 last the ear opening is covered, and the scales are small and 

 smooth. The Spotted Lizard (Holbroof^ia maculata of Girard) is 

 common east of the mountains, from Boulder to La Junta and 

 Trinidad, and east to Wray. It has two or three dark blue or 

 black patches on each side of the abdomen beneath. The Col- 

 lared Lizard (Crotaphytus collaris baileyi of Stejneger) is a com- 

 paratively large animal, with a double collar of two transverse 

 black bands, and many small light spots in the back. The tail is 

 profusely spotted. This handsome species is reported from Rifle 

 Gap, Grand Junction, Delta and Trinidad. 



The species of Sceloporus, or Swifts, are rather thickset lizards, 

 with comparatively large, keeled scales, the keel often produced 

 to a sharp point. Our common form is the Yellow-banded Swift 

 (S. thayerii of Baird and Girard*), found across the country from 

 Wray to Grand Junction, but of course not in the high mountains. 

 The Sage-brush Swift (S. graciosus of Baird and Girard) occurs 

 in the western part of the State. It is longitudinally striped dark 

 and light, the margins of the stripes conspicuously wavy. The 

 supraorbital plates are in five rows, while there are only four rows 

 in S. thayerii. The members of the genus Uta, also called Swifts, 

 are more slender as a rule, with the tail very long. There is a 

 gular fold, absent in Sceloporus. We have two species in Western 

 Colorado, the Ornate Swift (U. ornata of Baird and Girard) and 

 Stansbury's Swift (JJ. stansburiana of Baird and Girard). 



U. ornata, belonging to the subgenus Urosaurus, lacks the 

 small blue blotch behind the base of the anterior leg, this being 



♦Recorded a* S. consobrinus Baird and Girard, but J. P. Jones (1926) shows that 5. 

 thayerii is the earlier name for the same animal. 



