16-60 inches. Shiny black above, each scale with a white or yellow spot; underside cream or yellow with alternating black blotches. In young snakes the yellow spots may be limited to the sides and to narrow bars across the back. The scales are smooth and in 21-23 rows.
Kingsnakes are common in woodlands and semi-open habitats, including marshes and vacant lots. They often bite when first captured, but tend to bite and chew rather than strike. They lay from 5-23 eggs.