I believe that the mexican hognose is a subspecies. Modern phylo-genetics classes it as a subspecies as far as I am aware. The only real difference is minor color morphology, maybe a few scales but not that I can remember, though I don't work with Heterodon nascius sp. or live where H. n. nascius and H. n. kennerlyi overlap. Even by old terms it occupies the same niche and has an overlapping range with H. n. nascius which also occupies the same niche, and they are capable of interbreeding, which is enough for "original phylogeny" to be happy.

With how much discrepancy there is as to whether either gloydi or kennerlyi are their own, I am going to go with they are subspecies of H. nascius nascius. At least until I find an article that provides sufficient DNA evidence, as is the basis with modern phylogenetics, to determine Heterodon nascius kennerlyi or Heterodon nascius gloydi as anything more than a subspecies.

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