Hybrids are definately possible if thats what your asking. It may not have ever been proven but I'd think I'd be pretty safe to say all snakes in the genus Thamnophis(Garter and Ribbion Snakes) can interbreed. I'd also be willing to bet snakes in the genus Thamnophis can hybridnize with snakes in the genus Nerodia(Water Snakes), athough actaully getting two of these snakes to breed would be a lot more difficult.