I just saw this on Kingsnake.com, produced (or at least being sold) by Tom Crutchfield.
This is a Moelendorff's Ratsnake x Ridley's Ratsnake (E. moellendorffi x E. t. ridleyi). Very cool if you ask me, although I'd rather take a pure moellendorffi.
I guess this is one way of keeping a Moellendorff's Ratsnake alive