Head drawings: genus Phrynonax(Serpentes: Colubridae) - compiled by Van Wallach Home

Phrynonax poecilonotus (from Amaral 1976)
Phrynonax poecilonotus (from Chippaux 1986)
Phrynonax poecilonotus (from Emsley 1977)
Phrynonax poecilonotus (from Pérez-Higareda & al. 2007)
Phrynonax poecilonotus (from Savage 2002)
Phrynonax poecilonotus (from Günther 1885-1902)
Phrynonax poecilonotus (from Wied-Neuwied 1822-1831)
Phrynonax poecilonotus (from Günther 1885-1902)
Phrynonax poecilonotus (from Wied-Neuwied 1822-1831)
Phrynonax poecilonotus (from Lancini & Kornacker 1989)
Phrynonax poecilonotus (from Lancini & Kornacker 1989)
Phrynonax sexcarinatus (from Stejneger 1901)
Phrynonax sexcarinatus (from Stejneger 1901)
Phrynonax sexcarinatus (from Stejneger 1901)
Phrynonax sexcarinatus (from Amaral 1976)
Phrynonax sexcarinatus (from Hoge 1964)
Phrynonax sexcarinatus (from Hoge 1964B)
Phrynonax sexcarinatus (from Hoge 1964)
Phrynonax sexcarinatus (from Hoge 1964B)
Phrynonax shropshirei (from Pérez-Santos & Moreno 1988)