INDEX.

Female butterflies generally dull-coloured, 259.
Female insects, mimicry by, 110, 259; colours of, 113.
Female sex, has no incapacity for as brilliant colouration as the male, 247; in some groups requires more protection than the male, 258.
Fishes, protective colouring of, 55.
Fissirostral birds, nests of, 238.
Flowers, causes of colour in, 127.
Flycatchers, genera of, absent from Celebes, 177.
Forbes, Edward, objections to his theory of Polarity, 17-23.
Force is probably all Will-force, 366.
Galapagos, 10.
Galton, Mr., on range of intellectual power, 339.
Ganocephala, 298.
Gastropacha querci, protective colour and form of, 62.
Gaudry, M., on fossil mammals of Greece, 299.
Geographical distribution, dependent on geologic changes, 1; its agreement with law of introduction of new species, 9; of allied species and groups, 12.
Geological distribution analogous to geographical, 13.
Geology, facts proved by, 2-5.
Giraffe, how it acquired its long neck, 42.
Glæa, autumnal colours of this genus, 62.
Gould, Mr., on sexual plumage of Gray Phalarope, 115; on incubation by male Dotterell, 115.
Grallina australis, 254.
Green birds almost confined to the tropics, 52.
Gymnocerus cratosomoides, 94.

365