618 Bulletin American Museum of Natural History [Vol. XLVI 



Lower California, and Clemmys marmorata is a wide ranging Pacific form 

 which may be expected in the San Diegan area in Lower California. 

 Uta mearnsi is included in this list, but it seems probable that it is in 

 fact a relict Sonoran form with a unique distribution; it is recorded 

 chiefly from the desert side of the Coast range, and the record from " 75 

 miles southeast of San Diego" is somewhat indefinite. 



The Colorado Desert fauna is a highly peculiar one, with two 

 distinctive groups of habitat associations, the desert and the riparian 

 (Grinnell, 1914). In southeastern California, the following amphibians 

 and reptiles are represented. 



Amphibians 



Bufo cognatus cognatus Bufo woodhousii 



Bufo punctatus Rana pipiens 

 Bufo alvarius 



Reptiles 



Phyllodactylus tuberculatus Kinosternon sonoriense 



Coleonyx variegatus Siagonodon humilis 



Dipso-saurus dorsalis dorsalis Thamnophis marcianus 



Uma notata Chilomeniscus ephippicus 



Callisaurus ventralis gabbii Sonora occipitalis 



Crotaphytus wislizenii Sonora episcopa 



Crotaphytus collaris baileyi Lampropeltis getulus yumensis 



Sauromalus obesus Lampropeltis getulus boylii 



Uta mearnsi Phyllorhynchus decurtatus 



Uta stansburiana stejnegeri Salvadora hexalepis 



Uta ornata symmetrica Coluber flagellum piceus 



Uta graciosa Arizona elegans ? 



Sceloporus magister Pituophis catenifer deserticola 



Phrynoso?na platyrhinos Crotalus mitchellii 



Phrynosoma m'callii Crotalus atrox atrox 



Xantusia vigilis Crotalus cerastes 



Cnemidophorus tessellatus tessellatus Testudo agassizii 



Pituophis catenifer rutilus, Thamnophis megalops, and Chilomeniscus 

 cinctus may be added to this list from Arizonan records, making forty- 

 two species in the Colorado Desert fauna. 



Twenty-two of these species have been recorded from northeastern 

 Lower California as follows : Coleonyx variegatus, Dipso-saurus dorsalis 

 dorsalis, Crotaphytus collaris baileyi, Uma notata, Callisaurus ventralis 

 gabbii, Uta mearnsi, Uta stansburiana stejnegeri, Uta graciosa, Uta ornata 

 symmetrica, Sceloporus magister, Phrynosoma platyrhinos, Xantusia vigilis, 

 Cnemidophorus tessellatus tessellatus, Coluber flagellum piceus, Lampro- 

 peltis getulus yumensis, Pituophis catenifer rutilus, Phyllorhijnchus decur- 



