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* Tench, proportions of the sexes in the 249; brightness of male, during breeding season, 340.
 * Tenebrionidæ, stridulation of, 302.
 * Tennent, Sir J. E., on the tusks of the Ceylon Elephant, 507, 515; on the frequent absence of beard in the natives of Ceylon, 560; on the Chinese opinion of the aspect of the Cingalese, 578.
 * Tennyson, A., on the control of thought, 123.
 * Tenthredinidæ, proportions of the sexes in, 254; fighting habits of male, 291; difference of the sexes in, 292.
 * Tephrodornis, young of, 468.
 * Terai, in India, 182.
 * Termites, habits of, 291.
 * Terns, white, 492; and black, 493.
 * , seasonal change of plumage in, 492.
 * Terror, common action of, upon the lower animals and man, 69.
 * Testudo elegans, 351.
 * nigra, 351.
 * Tetrao cupido, battles of, 367; sexual difference in the vocal organs of, 371.
 * phasianellus, dances of, 380; duration of dances of, 405.
 * scoticus 455, 465, 471.
 * tetrix, 455, 465, 471; pugnacity of the male, 363.
 * umbellus, pairing of, 367; battles of, 367; drumming of the male, 375.
 * urogalloides, dances of, 405.
 * urogallus, pugnacity of the male, 363.
 * urophasianus, inflation of the œsophagus in the male, 372.
 * Thamnobia, young of, 468.
 * Thaumalea picta, display of plumage by the male, 396.
 * Thecla, sexual differences of colouring in species of, 310.
 * rubi, protective colouring of, 312.
 * Thecophora fovea, 308.
 * Theognis, selection in mankind, 29.
 * Theridion, stridulation of males of, 273.
 * lineatum, 272.
 * Thomisus citreus, and T. floricolens, difference of colour in the sexes of, 272.
 * Thompson, J. H., on the battles of sperm-whales, 500.
 * , W., on the colouring of the male char during the breeding season, 340; on the pugnacity of the males of Gallinula chloropus, 360; on the finding of new mates by magpies, 407; on the finding of new mates by Peregrine falcons, 408.
 * Thorax, processes of, in male beetles, 295.
 * Thorell, T., on the proportion of the sexes in spiders, 255.
 * Thornback, difference in the teeth of the two sexes of the, 334.
 * Thoughts, control of, 123.
 * Thrush, pairing with a blackbird, 414; colours and nidification of the, 455.
 * Thrushes, characters of young, 455, 464.
 * Thug, remorse of a, 117.
 * Thumb, absence of, in Ateles and Hylobates, 51.
 * Thury, M., on the numerical proportion of male and female births among the Jews, 243.
 * Thylacinus, possession of the marsupial sack by the male, 161.
 * Thysanura, 279.
 * Tibia, dilated, of the male Crabo cribrarius, 276.
 * and femur, proportions of, in the Aymara Indians, 34.
 * Tierra del Fuego, marriage-customs of, 598.
 * Tiger, colours and markings of the, 545.
 * Tigers, depopulation of districts by, in India, 46.
 * Tillus elongatus, difference of colour in the sexes of, 294.
 * Timidity, variability of, in the same species, 69.
 * Tineina, proportion of the sexes in, 250.
 * Tipula, pugnacity of male, 280.
 * Tits, sexual difference of colour in, 458.
 * Toads, 349; male, treatment of ova by some, 163; male, ready to breed before the female, 212.