John, the pattern and coloration are similar on both species, but with the exception of photo illusion (it never fails on an ID quiz that the resounding answer is Rhinocheilus), they're quite different snakes in all other respects. If you were presented with a bucketful of both species, you could easily seperate them, color-blind or not. The easiest way would be to stick you hand in the bucket, and remove all biters, until none of the serpents were biting......then you'd be left with a bucketful of nothing but longnose snakes.....or perhaps you could just wait a day, and the longnoses would all become Dinodon semicarinatum snacks
Joking aside, they are quite different morphologically, but impressive, defensive snakes nonetheless; even as mere hatchlings they aren't pleasant.......there's no way I'd let a subadult get ahold of me......and watersnakes don't bother me a bit!

Shane
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