This one seems pretty baffling to me as well. My range maps show E. davidi to range further around the western bend in the Beijing area, but who really knows. And even so, it doesn't seem to have the "davidi" phenotype I would expect to see. I wonder if it couldn't even be some weird isolated Island form of one of the more common species there too. It sure doesn't seem to look like any I would expect to see from that area.
Seems way too Ratsnake looking to be any of the Gloydius/Amur vipers that I have seen photos of too...........weird!
~Doug
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"a snake in the grass is a GOOD thing" 
