In regards to the earlier thread on the gaigae/MBK thing, here is a genuine "melanistic" thayeri another forum member posted in the king forum just recently. I mentioned earlier that even THIS "could" have been a small possibility.
Note the uncanny resemblence these also have to nigrita by their phenotype alone with no other color/pattern to otherwise go by unless scalation meristics are used.
These are a very interesting variety of thayeri, and I have always wondered why more are not seen in the hobby. After all, they are a very wild-type variation that can be produced in any given clutch a variable kings(thus the name).
I think it might have something to do with many breeders being more into the "flashier" colored varieties in more recent years, and also because many thayeri lineages have been diluted with other mexicana genepools too over the course of many years now too.
Anyway, I have ALWAYS thought that the "real-deal" melanistic thayeri were extremely cool!! 
~Doug

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"a snake in the grass is a GOOD thing" 
my website -serpentinespecialties.webs.com




