Charlie Parker And Pablo Boa Constrictor

• Boa constrictor sigma (Smith 1943): A very controversial possible subspecies from the Tres Marias Islands, Mexico. It appears like a B. c. imperator but has a higher number of ventral scales than B. c. imperator. It is possible a slightly different climate may have caused such a change, but this could then undermine the other insular subspecies such as B. c. orophias and B. c. nebulosa.
• Boa constrictor isthmica (Garman 1883): Considered synonymous with B. c. imperator. It is from Panama.