To be honest, while showing the dorsal can be helpful in observing the overall difference in color, the ventral view, in my opinion, has always been more definitive in determining such traits as Axanthism which you can read about in the many posts I've written before on this topic:



Defining Axanthics

RE: Defining Axanthics

Anerythrism vs. Axanthism Part 1

Anerythrism vs. Axanthism Part 2

Revisiting common genetic terms...

RE: Anery Question #1

RE: Anery Question #2



I hope those links are helpful in your quest to determining what it is you have, or have seen.
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Troy Rexroth

Rextiles

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• annery or axanthic mexican hognose - FR, Mon Oct 29 17:04:51 2012
• RE: annery or axanthic mexican hognose - Rextiles, Mon Oct 29 19:58:49 2012
• RE: annery or axanthic mexican hognose - FR, Mon Oct 29 22:13:46 2012
• RE: annery or axanthic mexican hognose - Rextiles, Mon Oct 29 23:38:04 2012
• RE: annery or axanthic mexican hognose - FR, Tue Oct 30 09:38:07 2012
• RE: annery or axanthic mexican hognose - Rextiles, Tue Oct 30 10:45:07 2012
• RE: annery or axanthic mexican hognose - FR, Tue Oct 30 12:42:55 2012
• RE: annery or axanthic mexican hognose - Rextiles, Tue Oct 30 13:18:58 2012
• RE: annery or axanthic mexican hognose - FR, Tue Oct 30 15:07:49 2012
• RE: annery or axanthic mexican hognose - Rextiles, Tue Oct 30 13:20:16 2012
• RE: annery or axanthic mexican hognose - FR, Wed Oct 31 08:30:26 2012
• RE: annery or axanthic mexican hognose - Gregg_M_Madden, Sun Nov 4 21:01:35 2012
• RE: annery or axanthic mexican hognose - FR, Mon Nov 5 21:41:15 2012
• RE: annery or axanthic mexican hognose - Gregg_M_Madden, Tue Nov 6 08:28:15 2012
• RE: annery or axanthic mexican hognose - Jason Nelson, Mon Nov 5 22:51:28 2012