Occasional Papers of the Museum of Zoology 21 



From the local distribution just described, it is evident that 

 one cannot from our material conclude with Taylor* that S. 

 biscn'atiis is less typically a mountain-dwelling species than S. 

 graciosus. According to Taylor's observations it does not in 

 Humboldt County, Nevada, range much higher than 5,000 feet, 

 but in our region it not only occurs principally in the moun- 

 tains but at least to an elevation of 7,754 feet. We believe 

 that it may be said that ►S'. hiseriatus is in this region almost 

 exclusively found in the mountains because it is a saxicolous 

 form and suitable habitats are almost entirely confined to the 

 hills. 



On warm days the lizards, after they appear in the morn- 

 ing, are quite common everywhere over the rocks until the 

 hottest part of the day, when they retire to the shaded side. 

 The food in the stomachs examined consists entirely of in- 

 sects. Large females taken on and before July 12 contain 

 large eggs apparently about ready to be laid, while those col- 

 lected on July 22 had deposited their eggs. The first young 

 were observed on August 14. On the latter date several young 

 ones which could have been but a few days old were found 

 among the rocks in Moleen Canyon. The one obtained meas- 

 ures 55 mm. in total length and 25.5 mm. exclusive of the tail. 

 They ran about over the ground and small rocks at the base of 

 the cliff and were very agile and shy, quickly seeking conceal- 

 ment under loose stones when alarmed. 



Sccloporus graciosus Baird and Girard. 

 (piv. V, FIG. I.) 

 Eighty specimens collected in the basin and on the slopes 

 of the Cortez and Pinyon Ranges. 



The specimens need little description. In nearly all of the 

 old females the lower light band from the eye to the shoulder, 



^Univ. of Cal., Pub. in Zool., Vol VII, 349. 



