(Serpentes: Colubridae) - compiled by Van Wallach
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Head drawings: genus
Tretanorhinus(Serpentes: Colubridae) - compiled by Van Wallach
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 | Tretanorhinus nigroluteus (from Lee 1996) |
 | Tretanorhinus nigroluteus (from Pérez-Higareda & al. 2007) |
 | Tretanorhinus nigroluteus (from Savage 2002) |
 | Tretanorhinus nigroluteus (from Savage 2002) |
 | Tretanorhinus variabilis (from Barbour & Ramsden 1919) |
 | Tretanorhinus variabilis (from Pinou & Dowling 1994) |