[5] Adults of B. medusa usually grow to 50–70 cm (1.6–2.3 ft) in total length (including tail).

The maximum reported total length is 80 cm (2.6 ft) (Roze, 1966) or slightly longer (Sandner-Montilla, 1975).

These bands are dark brown with pale centers, weakly subdivided laterally and separated from each other with short and lightly colored interspaces.

On the head, a dark postocular stripe is present that frequently fuses with the first lateral body blotch.

[4] B. medusa is found in Venezuela, including the Cordillera de la Costa (coastal range), the Federal District and the states of Aragua, Bolívar and Carabobo.