Among those you listed, the only detached from the hybrid zone is the rat snake. The others connect with other subspecies. The Yuma is just a dark (melanistic) cal king, and might actually represent an intergrade morph between the Black king and the Cal King. The coastal Plain milksnake is either a hybrid between the Eastern King and Scarlet King (different species) or a remnant population of Red Milks that became separated during the last ice age. Or, it could just be a red form of the Eastern milk that has been altered by habitat.

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