- Midas dives, 97.
- Mimeta, mimicking Tropidorhynchus, 104.
- Mimicry, meaning of the word, 74; theory of, 76; among Lepidoptera, 77; how it acts as a protection, 80, 81; of other insects by Lepidoptera, 89; among beetles, 91; of other insects by beetles, 95; of insects by species of other orders, 97; among the vertebrata, 99; among snakes, 101; among tree frogs, 103; among birds, 103; among mammals, 107; objections to the theory of, 108; by female insects, 110; among Papilionidæ, 179; never occurs in the male only, 260.
- Momotidæ, sexual colouring and nidification of, 241.
- Montrouzier, M., on butterflies of Woodlark Island, 152.
- Moral sense, difficulty as to the origin of, 352.
- Morphos, how protected, 73.
- Murray, Mr. Andrew, objections to theory of mimicry, 108.
- Muscicapidæ, sexual colouring and nidification of, 245.
- Musophagidæ, sexual colouring and nidification of, 242.
- Napeogenes, all the species are mimickers, 85.
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