Fungus chambers, [387]

Fungus-growing Termites, [385], [387]

Funiculus, [492]

Furca, [103]

Furcal orifices, [399], [402]

Galapagos Islands, [459]

Galea, [95]

Gall-flies, [523] f.

Galls, [514] f.;

nature of, [525] f., [533]