Hi Mike!,..long time, no see bud!
Well, yes, from the looks of it, I have to agree with Greg on it being a Blotched Water Snake as well. They are said to range more within the lower plain area elevations from what I gather as he also stated, but I have found that there are many exceptions to range maps with many different types of snakes anyway. The plain, muted belly, and blotched dorsal pattern all are indicative of Nerodia erythrogaster transversa.
Hope you are succesful with feeding the little captive buddy, and hope you and the female leucistic T-Rat are still getting along well..LOL!
best regards, ~Doug
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"a snake in the grass is a GOOD thing" 
