Quote:
Boa constrictor Imperator (BCI) have 253 ventral scales (or less) and a midbody scale count of 55-79. 21 or more dorsal blotches (saddles).
Boa constrictor constrictor's (BCC) have 234 to 250 ventral scales and a midbody scale count of 89-95. Less than 20 dorsal blotches.
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Redtailboas.com - Amazing Boas and the Ultimate Care Guide
Also the 'peaks'. The Bcc have more prevelent peaks.
That is my knowledge on the subject. Although when I first got into a discussion about BCC vs BCI when I joined here, JS said to read up on the different localities, and examine pictures of the types and sooner or later it would just sink in. Like the way a person recognizes the differences between a Doberman and a German Shepard. Sooner or later you just learn to identify the differences and they will become so obvious that you won't believe you didn't see them before.