The mexican and plains status have been changed. They have dropped the sub-species and taken them to the species level. They are now heterodon nasicus and heterodon kennerlyi. That means a breeding between the two would result in a hybrid, not an intergrade.



To my knowledge, there is no confirmed natural occurring intergrades between the the two where they co-exsist. The different breeding seasons seem to naturally control this from happening.



I dont believe there has been much of this happening in captivity. I think most plains are true plain and the mexican are pure as well. I have never seen an animal that would make me question this. Everything that I have seen that looks plains, scales out as plains and everything that looks mexican scales out to be a mexican.



As far as locality pure animals, there are not many locale specific plains, but the majority of mexicans in captive breeding programs are. This probably has to do with the the amount of morphs available in the plains, the large amount of animals in captivity, and the fact that they have been bred in captivity longer.



My $.02



-Jon

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