The Sonoran Desert Conservation Plan has identified amphibians and reptiles that are, or were, native to Southern Arizona. The list can be found at Pima County Amphibian & Reptile Listing.
The information includes genus and species and whether the animal is extinct or has been exterminated.
The Arizona-Sonoran Desert Museum provides a list at Reptile & Amphibian Accounts.
Find the information you need by calling the library's Infoline at 520.791.4010 or by sending your question to Askalibrarian.