Cole,
It's hard to comment about those early specimens without having them handy to examine. As far as range, AFAIK< all have been from within known mexicana range, but the latest one was a bit of a surprise - all I can say is it's from the northern part of the range and a new state record for the phenotype.

It's critical to have exact locality data for any individual specimen in order to discuss it with any authority. There is enough confusion and add the possibility that we are looking at different things from different localities, with the distinct possibility of mixing going on in any of the known localities.

Anything from down near dixoni / southern annulata I would first suspect triangulum and go from there, but all the Nuevo leon "Milks" that I am aware of are not of that habitat type.
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LOCALITY: Traceable lineage to WC snakes from the same locality.
I don't care how far apart they are (within reason) as long as the localities are stated, buyers can make up their own minds.

NON-LOCAL or GENERIC: Lineage is not traceable to WC
Generics need love too.

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