Circus, [146], [147], [154];

fossil, [181];

habits, [154] f.;

C. aeruginosus, [155];

C. approximans, [155];

C. assimilis, [155];

C. cineraceus, [155];

C. cinereus, [155];

C. cyaneus, [155];

C. gouldi, [155];