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

Pseudalsophis biserialis (from Pérez-Santos & Moreno 1990)
Pseudalsophis biserialis (from Mertens 1960)
Pseudalsophis elegans (from Donoso-Barros 1966)
Pseudalsophis elegans (from Tschudi 1845)
Pseudalsophis elegans (from Guzmán & Flores 2009)
Pseudalsophis elegans (from Guzmán & Flores 2009)
Pseudalsophis elegans (from Guzmán & Flores 2009)
Pseudalsophis elegans (from Guzmán & Flores 2009)
Pseudalsophis elegans (from Guzmán & Flores 2009)
Pseudalsophis hoodensis (from Mertens 1960)
Pseudalsophis hoodensis (from Pérez-Santos & Moreno 1990)