Western Ribbon Snake

T. proximus is a slender snake with a very long tail, approximately one-third of the total length of the body. Dorsally, T. proximus is blackish, brown, or olive with three light-colored stripes. Ventrally, it is greenish-white or yellowish-white. The upper labials are whitish and unmarked, contrasting with the dark top and sides of the head. The specific name, proximus, describes the species' similarity to T. saurita. Adults measure 17–50 in (43–127 cm) in total length (including the tail).

T. proximus is a semiaquatic snake that occurs in a wide range of habitats, usually not far from water. It can be found from sea level to nearly 2,500 m (8,200 ft). It feeds on a range of invertebrates (earthworms, crayfish) and small vertebrates (lizards, fishes, and frogs, including tadpoles). They serve as prey for birds (hawks, owls, egrets, herons) and mammals (coyotes, foxes, raccoons, minks).