I dunno about that. I think we need give the whole system a gradual transformation based on genetic reality instead of relying on physical similarities. It's pretty obvious that most species of Garter snakes are going to be very closely related genetically, but I do believe that some other (older) species that have been traditionally considered closely related may turn out to be fairly far from closely related. We need rely more on genetic relationships because that is where the reality of relationship lies. this will take many years, perhaps decades, of course, to sort out. Who knows, it might turn out that some species of Pituophis may be closer related genetically to some species of Lampropeltis and visa/versa. Just for example.