[6] The western worm snake has a dark, black or purplish dorsal coloration, with a lighter, pink or reddish underside.

[8] The western worm snake is found in the United States in southern Iowa, southeastern Nebraska, eastern Kansas, western Illinois, Missouri, Louisiana, eastern Oklahoma, and northeastern Texas with isolated records from southwestern Wisconsin, southeastern Arkansas and middle Tennessee.

[4] C. vermis is fossorial, and spends the vast majority of time buried in loose, rocky soil, or under damp forest leaf litter.

[9] Little is known about the mating habits of the western worm snake, but breeding likely occurs in the early spring.

The western worm snake's diet consists almost entirely of earthworms,[9] but it will also consume soft-bodied insects.