You're right about the ontogentic change in color. Almost all of the adult ridleyis I've seen in the market have the light, cream dorsal stripe. But adults from the Cameron Highlands region of Malaysia retain the bright yellow dorsal stripe of juveniles and have a greenish-yellow background rather than a whitish, cream, or copper background. This is consistent with Schulz's description of ridleyi in his book on elaphe. It's a little known fact that the Cameron Highlands ridleyis do not live in caves, since there are none in that region.

I've done a lot of online and literature research on ridleyi, and there's very little written on them. The following website probably has the largest collection of pictures of ridleyi in their natural environment: http://www.cavesofmalaysia.com/photopage12.htm

The picture below is my 34 month old C.H. male who's almost 7.5 ft.

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