Great Plains Ground Snake vs. Ground Snake
Split by DNA in 2018 (Cox et al.); the two meet in western Texas and eastern New Mexico (records share 6 one-degree squares). A: Oval saddles in the Great Plains Ground Snake; squarer, rectangular crossbands in the Western Ground Snake. Plain and striped animals cannot be told apart by sight: PLACE DECIDES. East of the Pecos and in Colorado, Kansas, Oklahoma and Missouri it is the Great Plains Ground Snake; in the deserts of far west Texas, western New Mexico and the West it is the Western Ground Snake.
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