Termites, [389];

Thysanura, [196];

Myriapods, [72] f.;

Palaeozoic Neuroptera, [343]

Founding communities, [381]

Fourmilions, [456]

Fowl, biting-louse of, [350]

Fritze on Ephemerid alimentary canal, [439]

Frons, [94]

Front wings absent, [260] f.