Baird, S. F.; Girard, C. F. (1852). Descriptions of new species of reptiles, collected by the U.S. Exploring Expedition under the command of Capt. Charles Wilkes, U.S.N., First Part—including the species from the western part of America. Proceedings of the Academy of Natural Sciences of Philadelphia. 6: 174–177.
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Baird, S. F.; Girard, C. F.
1852
Descriptions of new species of reptiles, collected by the U.S. Exploring Expedition under the command of Capt. Charles Wilkes, U.S.N., First Part—including the species from the western part of America
Proceedings of the Academy of Natural Sciences of Philadelphia