Erichson 1934 Perognathus baileyi domensis West base of Castle Dome, Yuma Co., Ariz. Jan. 10, 1934. A male taken on mesa between two of isolated hills at base of dome; soil finer at this point than on much of mesa; taken under a creosote bush; a Dipodomys m. taken within five feet, and another within 25 ft.; giant cactus and goat nut other brush plants common in region.