This species is endemic to the island bank of Antigua and Barbuda, where it once ranged over most of the islands; however only subfossil remains (tentatively attributed to this species) have been found on Barbuda, and the species went extinct from the main island of Antigua shortly after the Asian mongoose (Herpestes javanicus or H. auropunctatus) was introduced at the end of the 19th century (Daltry et al. 2001). The area of distribution for this species has been increased from 8.4 ha to 65 ha (0.1% of its natural range). The snake can be found at all elevations of its current distribution range (up to approximately 30m), but was probably also found at higher elevations on Antigua prior to its extinction on the island (J. Daltry pers. comm. 2010).