Features used in the key for adult specimens
Nuchals: Scales found on back between the post-occipitals and the dorsals
Spectacle
Nu: nuchals
P.O.: post-occipitals
Ridges
Snout
Eyelid
Nasal swelling
Dorsals (D) separated from nuchals (NU)
Dorsals (D) continuous with nuchals (NU)
D             Nu
D              Nu
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