- River system, as illustrating self-adaptation, 276.
- Roses, Mr. Baker on varieties of, 165.
- Rudimentary organs, 23.
- SALVIN, Mr. Osbert, on a case of bird mimicry, 107.
- Saturnia pavonia-minor, protective colouring of larva of, 63.
- Satyridæ, probable means of protection of, 176.
- Sauropterygia, 299.
- Savages, why they become extinct, 319; undeveloped intellect of, 339, 341; intellect of, compared with that of animals, 341, 343; protect their backs from rain, 346.
- Scansorial birds, nests of, 238.
- Scaphura, 98.
- Scissirostrum, 165.
- Scopulipedes, brush-legged bees, 91.
- Scudder, Mr., on fossil insects, 301.
- Scutelleridæ, mimicked by Longicorns, 96.
- Sesia bombiliformis, 90.
- Sesiidæ, mimic Hymenoptera, 90.
- Sexes, comparative importance of, in different classes of animals, 111; diverse habits of, 156.
- Sexual selection, 156; its normal action to develop colour in both sexes, 247; among birds, 283.
- Sidgwick, Mr. A., on protective colouring of moths, 62.
- Simocyonidæ, 300.
- Sitta, sexual colouring and nidification of, 243.
- Sittella, sexual colouring and nidification of, 243.
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