The Great Plains Rat Snake (Pantherophis emoryi) is a species of non-venomous rat snake native to the eastern two thirds of the United States, from New Jersey to Nebraska, to Colorado, south to Texas, and into northern Mexico. It is sometimes considered a subspecies of the corn snake, which is commonly kept as a pet. The two are sometimes interbred to produce varying pattern and color morphs. The epithet emoryi is in honor of Brigadier General William Hemsley Emory, who was chief surveyor of the U.S. Boundary Survey team of 1852 and collected specimens for the Smithsonian Institution. As such, it is sometimes referred to as Emory's Rat Snake.