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Thamnophis sirtalis concinnus
About 3 feet long.
Oregon Coast. Apparently a burrower.
Was sitting outside a burrow in the grass. When we got too close it went down into the burrow.
They make a minor neurotoxic venom, but can't really deliver it to humans easily with posterior venom glands. (http://en.wikipedia.org/wiki/Garter_snak...).