c'est dit ici qu'il y en a deux sous-espece sans jaune sur la tete:
http://www.wingscc.com/aps/m-desc.htm
Poicephalus meyeri meyeri (yellow on the head with a turquoise/bluish belly)
Poicephalus meyeri saturatus (yellow on the head with a green belly)
Poicephalus meyeri trasvaalensis (yellow on the head with a greenish belly )
Poicephalus meyeri matschiei (yellow on the head, bright blue belly)
Poicephalus meyeri damarensis (no yellow on the head turquoise belly)
Poicephalus meyeri reichenowi (no yellow on the head turquoise belly)