508 University of California Publications in Zoology [Vol. 12 



most cases are the habitat preferences of these easily observed animals. 

 An occasional species, like Uma notata and Xantusia vigilis, is re- 

 stricted entirely to one kind of habitat, and no species, even though 

 abundant, is known to range into every type of environment, although 

 there are no apparent physical reasons why it should not do so. Theo- 

 retically, therefore, it may be possible for isolation to occur in a very 

 limited region of well differentiated habitats and associations. This 

 suggests interesting problems concerned with habitat limitations (see 

 Grinnell, 1914, p. 102), and the separation of species and genera 

 within a faunal area. Of the eight genera of iguauine lizards here 

 represented only three range much beyond the limits of the arid 

 Southwest. All are closely related and belong to a single group within 

 the sub-family. Many of the differences between these genera seem to 

 be adaptive and to be correlated with the differences in the nature of 

 their habitats. 



CHECK-LIST OF THE SPECIES OF AMPHIBIANS AND 

 REPTILES OF THE TURTLE MOUNTAIN REGION 



Little uniformity prevails in the use of vernacular names for most 

 reptiles. Nearly all our species have several book names, and others 

 are burdened with appellations belonging to more than one species. 

 The matter might well be put into the hands of a committee appointed 

 to edit the names that have been used, and to decide upon suitable 

 ones, if vernaculars are not to be dropped from the literature alto- 

 gether. The common names employed in the following list have been 

 selected for descriptive appropriateness or because of long use. The 

 authorities here followed in the adoption of vernacular names are 

 Ditmars (1907), Grinnell (1908), Grinnell and Grinnell (1907), Meek 

 (1906), Merriam in Stejneger (1893), Stone (1911), Van Denburgh 

 (1897), and Yarrow (1882). Whenever a descriptive name could be 

 found it has been employed ; in a few cases vernaculars in the follow- 

 ing list have not been used before. 



1. Bufo punctatus Baird and Girard. Spotted Toad 



2. Testudo agassizii (Cooper). Desert Tortoise. 



3. Dipsosaurus dorsalis (Baird and Girard). Desert Iguana. 



4. Uma notata Baird. Ocellated Sand Lizard. 



5. Callisaurus ventralis ventralis (Hallowell). Gridiron-tailed Lizard. 



6. Crotaphytus eollaris baileyi (Stejneger). Bailey Collared Lizard. 



7. Crotaphytus wislizenii Baird and Girard. Leopard Lizard. 



