Couch's Spade Foot (Scaphiopus couchi: Yarrow, Henry C. 1882. Check list of North American Reptilia and Batrachia with catalogue of specimens in U. S. National Museum. Bulletin of the United States National Museum (24):1-249); Sonora Spade Foot (Scaphiopus varius rectifrenis: Yarrow, Henry C. 1882. Check list of North American Reptilia and Batrachia with catalogue of specimens in U. S. National Museum. Bulletin of the United States National Museum (24):1-249); Cape St. Lucas Spade Foot (Scaphiopus varius varius: Yarrow, Henry C. 1882. Check list of North American Reptilia and Batrachia with catalogue of specimens in U. S. National Museum. Bulletin of the United States National Museum (24):1-249); Couch's Spadefoot (Scaphiopus couchii: Strecker, John K. 1922. An annotated catalogue of the amphibians and reptiles of Bexar County, Texas. Bulletin Scientific Society of San Antonio (4):1-31); Southern Spadefoot (Scaphiopus couchii: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Sonoran Spadefoot (Scaphiopus couchii rectifrenis: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Sonora Spadefoot (Scaphiopus couchii rectifrenis: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Cape St. Lucas Spadefoot (Scaphiopus couchii varius: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Great Plains Spadefoot (Scaphiopus couchii: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.);