OMG!!!, that's a freakin BLACK MAMBA Tim!!
HAHAA!! Remember the ridiculous news stories and articles a while back posted on the ratsnake forum, where certain folks of the town thought that a very typical black ratsnake they found and killed was actually an escaped "Black Mamba"?..LOL!.
Anyway, WOW!, Those solid black Garter's are pretty darn cool looking man!. Rarely do I ever see or hear of the melanistic forms being found, or even kept and produced for that matter, even though I definitely know they exist in certain spots here and there.
I captured a nice melanistic Eastern Hognose in Ft. Pierce, Florida on the east coast as I was getting off of I-95 onto the off-ramp section. Luckily there was no traffic directly behind me so I could immediately come to a dead stop in the middle of the road to snag it..LOL!
Great find man!. Have you ever captured other melanistic Garter's in your Ohio area before?
~Doug
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"a snake in the grass is a GOOD thing" 
my website -serpentinespecialties.webs.com