The Red-bellied Racer (Alsophis rufiventris) is a species of Colubrid snake that is endemic to the Lesser Antilles in the Caribbean, where it is found on the islands of Saba, Sint Eustatius, Saint Kitts, and Nevis. Males have black-bordered blotches that transition into a dark mid-dorsal stripe towards the posterior. Females have a series of middorsal streaks and smudges that fade towards the posterior. Other common names include the Saba Racer and the Orange-bellied Racer.