Girard, C. F. 1861. Annals of the Lyceum of Natural History of New York. 7 (art. 30): 313.
Girard, C. F. 1856. Proceedings of the Academy of Natural Sciences of Philadelphia. 8: 218.
Type Status:
Holotype
Place:
Fort Dalles Oregon (the Dalles, Oregon), Columbia River. Suckley's Locality - Girard mistakenly reported the locality as St. Mary's Mission, Flathead Valley, Oregon, in original description, Wasco County, Oregon, United States, North America
Olson, Storrs L. 1978. "A paleontological perspective of West Indian birds and mammals." In Zoogeography in the Caribbean. The 1975 Leidy Medal Symposium. Gill, Frank B., editor. 99–117. In Academy of Natural Sciences of Philadelphia Special Publication, 13.
Descriptions of New Species of Reptiles, Collected by the US Exploring Expedition under the Command of Capt. Charles Wilkes, USN: First Part: Including the Species from the Western Coast of America
Baird, Spencer Fullerton. 1849. "Descriptions of four new species of North American salamanders and one new species of skink." Journal of the Academy of Natural Sciences of Philadelphia, 4.