What I am suggesting is that snakes from an area have a dominate iris color. Most Black Rats from Eastern Virginia seem to have a silver eye color.

To talk about the eye color of "Black Rats" from eastern Kansas, is not exactly the same thing. Eastern Black Rats are a color variation in Pantherophis alleghaniensis. Eastern Kansas Black Rats are Pantherophis spilodies. Still I think that all the Rat Snake morphs have dominant iris colorings that change from region to region. You can also see this in the color seen between scales. Many of the animals pictured from the west seem to show a red color between their scales, while the Rat Snakes from the east have white.

Another example is seen in Baird's Rat Snakes. The coloring of snakes found in Mexico is clearly different from animals found in Texas.

Might I ask if those in an area where "Greenish" Rat Snakes are found (SC?), is there a dominate iris color seen in these snakes?

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