on Ortyxelus, [295] n.;

families of Oscines, list of, [495];

on Owls, [400];

on Podicipes, [52] n.;

on Sturnidae, [559];

on Strix, [404];

on Thamnobiae, [510];

on Timeliidae, [502]

Sheartail, Peruvian, [438]

Shearwater, [61]-[63], [65], [66];