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Range DescriptionThe two subspecies of this boa both have restricted ranges separate from one another. E. monensis monensis is restricted to Isla Mona, west of Puerto Rico, which has an area of less than 50 kmÂ². E. monensis granti is found in the British and US Virgin Islands (areas 150 and 350 kmÂ² respectively) including Cayo Diablo, Tortola, Great Camanoe, Guana, Necker, and the eastern end of the island of St. Thomas (Mayer and Lazell 1988). This species is also found on the island of Puerto Rico itself, in the foothills of the Sierra Luquillo and Cayo Diablo, Isla Culebra (Tolson 1996). The snake ranges from sea level to 100 m above sea level.