Natrix rigida sinicola Huheey, 1959 The Gulf crayfish snake (Liodytes rigida sinicola) is a subspecies of nonvenomous snake endemic to the southeastern United States.

It averages 20 inches (51 cm) when fully grown, with a record of 31.5 inches (80 cm).

Its color is best described as chocolate brown.

This subspecies feeds almost entirely on crayfish.

Close relatives of the Gulf crayfish snake are the glossy crayfish snake (Liodytes rigida rigida) and the Delta crayfish snake (Liodytes rigida deltae).