Tom,
The information you seek can be found in the Palmer and Braswell book on reptiles of NC. Click here and scroll down for information about this publication and how to obtain a copy. It is an awesome book, one that any serious rat snake fan or field herping enthusiast should be without (especially if interested in NC herps!)

Generally speaking, in the state of NC the striped forms are considered yellow rat snakes and the blotched ones are greenish.

dg

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