I agree with Rainer in that the snake is what is known in the hobby as "axanthic". But this is certainly not to say there isn't a whole bunch of confusion between axanthism and anerythrism, because there sure the heck is, and in some cases it is a very complex issue to accurately distingush either way in certain types of snakes.
This is because the word "axanthic" itself literally means lack of yellow, and is derived from the Greek word "xanthos" meaning yellow,....thus the term "axanthic" for no yellow, and not anerythristic(lack of red pigment(erythrin).
However, the huge problem lies in exactly which pigment cells(chromatophores are responsible for the lack of either color(s).
See, xanthophores produce BOTH reds AND yellow pigments, and any shade in between, but they are commonly referred to as separate entities. It is also quite complicated because brooks can naturally have both yellows and reds in their color scheme, or just shades of yellow, or just red/orange shades too. Or even none of these, just shades of blacks, greys, and white/beige in some. Now with a snake that only posesses melanin and yellows, such as a splendida, it being termed as axanthic is much simpler because it only involves the yellow colorations, but when you get into snakes involving any combinations of reds, oranges and yellows, it can be much more complex to understand..LOL!
There is no doubt that there are some different bloodlines and phenotypes of these anery, or axanthic brooks, and they have to be called something, and the bluish hued individual in the above post does in fact look to be what are known as "axanthic" brooks, and quite possibly from the New England bloodline too. But as to what exactly the many different lines actually are, is very debatable. Here is the problem, and why it can be much more complex than just what we see in the phenotypic colors of certain snakes.
Xanthophores.......
These chromatophores produce red and yellow pigments known as pteridines. These may vary in color from pure yellow to pure red, as well as intermediate shades. Xanthophores possessing a predominantly red coloration are referred to as erythrophores.
Xanthophores also retain yellow to reddish pigments contained in the diet in the form of carotenoids. Carotenoid retention continues throughout life, and intensity of pigmentation varies based on the quantity and types of carotenoids contained in the diet. Additionally, the animals' genetic predisposition towards and ability to store carotenoids will affect appearance.
As soon as I saw that photo Tom posted, I said to myself, that is an axanthic brooks as Rainer also mentioned. I also lightened the photo on my comuter and it still had the VERY strong tell-tale bluish trait indicative of what are known as axanthic brooks.
Anyway, there is nothing real cut and dry when it comes to really fully understanding certain genetics, and exactly what causes ther phenotypic look..LOL!
~Doug
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"a snake in the grass is a GOOD thing" 
my website -serpentinespecialties.webs.com