SONORA LOWER CALIFORNIA REPTILES 33^ 



46. Crotalus atrox 



47. Kinosternon sonoriense 



48. Gopherus agassizii 



49. Dermochelys schlegelii 



Lower California seems to comprise four chief areas of 

 reptile distribution. These are: First, the Cape Region, 

 north to about La Paz, in which there is practically an in- 

 sular fauna which includes representatives of tropical, 

 Lower Sonoran, and Upper Sonoran zones 5 second, the cen- 

 tral portion of the peninsula, chiefly Lower Sonoran j third, 

 the northwestern portion of the peninsula, a part of the San 

 Diegan Fauna of the Upper Sonoran Zone 5 fourth, the 

 northeastern portion of the peninsula, which is a southward 

 extension of the Colorado Desert and is Lower Sonoran. 



The reptiles of Lower California, not including the 

 islands of the west coast and of the Gulf of California, are: 



1. Phyllodactylus tuberculosus 



2. Phyllodactylus unctus 



3. Coleonyx variegatus 



4. Ctenosaura hemilopha 



5. Dipsosaurus dorsalis dorsalis 



6. Dipsosaurus dorsalis lucasensis 



7. Sauromalus ater 



8. Sauromalus interbrachialis 



9. Crotaphytus collaris baileyi 



1 0. Crotaphytus wislizenii 



1 1 . Uma notata 



12. Callisaurus crinitus 



13. Callisaurus draconoides draconoides 



14. Callisaurus draconoides carmenensis 



1 5. Callisaurus ventralis ventralis 



16. Holbrookia maculata approximans ? 



17. Uta thalassina 



