(('Vireolanius leucotis',(('Cyclarhis gujanensis','Yuhina zantholeuca'),('Hylophilus ochraceiceps','Vireo cassinii'))),('Pteruthius xanthochlorus',(('Pteruthius aenobarbus','Pteruthius melanotis'),('Pteruthius flaviscapis','Pteruthius rufiventer'))));