Yes, I have a theory about that - the Cordillera Central being the physical barrier dividing the Boa constrictor imperitor tribe to the Pacific side and Boa constrictor constrictor to the Atlantic side in South America. I believe Russo covered the topic in his book.
The whole taxonomy of Boa constrictor ssp., in all it's forms, is somewhat ill defined and ambiguous in my mind.
jsc
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"As hard as I've tried, just can't NOT do this"
John Crickmer

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