Baird & Girard, 1853 : Catalogue of North American Reptiles in the Museum of the Smithsonian Institution. Part 1.-Serpents. Smithsonian Institution, Washington, p. 1-172 (texte intégral).
Cope, 1895 : On some North American Snakes. The American Naturalist, vol. 29, p. 676-680 (texte intégral).
Kennicott, 1860 : Descriptions of new species of North American serpents in the museum of the Smithsonian Institution, Washington. Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 12, p. 328-338 (texte intégral).