Flat-headed Tantilla (Tantilla planiceps: 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); California Tantilla (Tantilla eiseni: Van Denburgh, John. 1897. The reptiles of the Pacific Coast and Great Basin: An account of the species known to inhabit California, and Oregon, Washington, Idaho, and Nevada. Occasional Papers of the California Academy of Sciences 5():9-236); Blainville's Tantilla (Tantilla planiceps: 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); Lower California Tantilla (Tantilla planiceps: Van Denburgh, John. 1922. The Reptiles of Western North America: An Account of the Species Known to Inhabit California and Oregon, Washinton, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora, and Lower California. Volume I. Lizards. California Academy of Sciences, San Francisco. 556pp.); California Black-headed Snake (Tantilla eiseni: Schmidt, Karl Peterson and D. D. Davis. 1941. Field Book of Snakes of the United States and Canada. C.P. Putnam and Sons, New York. 365pp.); Flatheaded Tantilla (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Lower California Black-headed Snake (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Tantilla (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Plain Headed Little Snake (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Plain Headed Tantilla (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Plain-headed Little Snake (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); Flat Headed Tantilla (Tantilla planiceps: Wright, Albert Hazen. 1950. Common names of the snakes of the United States. Herpetologica 6(6):141-186); California Black-headed Snake (Tantilla eiseni: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); California Black-headed Snake (Tantilla eiseni eiseni: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); Desert Black-headed Snake (Tantilla eiseni tranmontana: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.);