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

Atretium schistosum (from Miralles & Ineich 2006)
Atretium schistosum (from Smith 1943)
Atretium schistosum (from Wall 1912)
Atretium schistosum (from Schleich & Kastle 2002)
Atretium schistosum (from Schleich & Kastle 2002)
Atretium schistosum (from Wall 1912)