Hi JOhn,
actually, that black and white snake was not a zonata agalma, but rather a zonata multicincta....
It's a rare snake in that it is seldom seen in the wild, and when it is, it's only from one of a couple distinct locations in the Sierra-Nevadas. This variation in multicincta have been subject to on-going study at U. C. Santa Cruz with respect to phenotypic expression in connection with differential habitat and influence of potential predation. These also exist in extremely limited numbers in a couple private collections.
The genotype isnt exactly well understood either, and will be further played out in future captive-breeding endeavors between myself and another individual. What's really interesting is that any "color" that bleeds through, which is typically a dorsal splotch right where the body end and the tail begins, is not red but what appears to be a creamy lavender -- as if there was some form of anerythrism going on.
Anyway, glad you asked so that I could clarify. Thanks John.


You can see that "anery" color-splotch better in this photo.....

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Jerry Kruse
And God said, "Let there be zonata subspecies for all to ponder..."