- Snakes, mimicry among, 101.
- Song of birds, instinctive or imitative, 220.
- Species, law of population of, 28; abundance or rarity of, dependent on the adaptation to conditions, 33; definition of, 141, 161; the range and constancy of, 143; extreme variation in, 163, 164.
- Speed of animals, limits of, 292.
- Sphecia craboniforme, 90.
- Sphecomorpha chalybea, 96.
- Sphegidæ, mimicked by flies, 97.
- Spiders, which mimic ants, 98; and flower buds, 99.
- Spilosoma menthastri, 88.
- Stainton, Mr., on moths rejected by turkeys, 78, 88.
- Stalachtis, a genus of Erycinidæ, the object of mimicry, 84.
- Stinging insects generally conspicuously coloured, 72.
- Streptocitta, 196.
- Sturnidæ, sexual colouring and nidification of, 244.
- Sturnopastor, 239.
- St. Helena, 10.
- Streptolabis hispoides, 93.
- Struggle for existence, 28, 33.
- Survival of the fittest, law of, stated, 33; its action in determining colour, 67.
- Swainson’s circular and quinarian theory, 45.
- Sylviadæ, sexual colouring and nidification of, 245.
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