[GarterGuy]

I agree with Stephan, I'm thinking strait T.radix. I know I've seen pics before of darker individuals that lacked the tell tale spotting that we're used to seeing on radix. As variable as many of the other garter species can be (did someone say sirtalis), I wouldn't think it'd be that much of a a stretch to see a radix dark like this. They do range over a really large area, so some variation is to be expected. Can't really do a scale count from the pics though, so not sure if it's 19 or 21? Still just think it's a dark radix.