OH has already addressed the meaning of rubidus..
As far as the physical traits of rubidus go, the white anterior ventral coloration is a dead give away.
The species it highly variable within its natural range, and I wouldn't be surprised if your source for rubidus, back in the day, collected from a specific locality.
Unfortunately, there is very little locality data available on any of the Drymarchon spp. currently in captivity, if any at all.
The primary indicating factors for identifying rubidus are scale counts and coloration.
The specimen I have posted is a descendent of wild caught stock produced by David Neske.

Regards,

Jeff

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