Again:- "Let us now look to the mutual Affinities of extinct and living species.
"Luck or Cunning?"
Samuel Butler
Gradually those that had mutual Affinities combined and separated themselves from the rest.
"The Roman Poets of the Republic"
W. Y. Sellar
Affinities of the genus Ptychohyla seem to me to be with the red-eyed species forming the Hyla uranochroa group in Costa Rica.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman