Check-list of North American Batrachia and Reptilia: with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U. S. National MuseumNo. 11–104
Cope, Edward D. 1875. "Check-list of North American Batrachia and Reptilia: with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U. S. National Museum." Bulletin of the United States National Museum, (1) 1–104.