INDEX. 789 



dances of, 460; tetrao scoticus, 518, 530, 537; tetrao tetrix, 518, 530, 

 537; pugnacity of the male, 412; tetrao umbellus, pairing of, 417; 

 battles of, 417; drumming of the male, 42(5; tetrao urogalloides, 

 dances of, 460; tetrao urogallus, pugnacity of the male, 412; tetrao 

 urophasiaiius, inflation of the oesophagus in the male, 428. 



'J 'hamnobia, young- of, 533. 



T/ieda, sexual differences of coloring in species of, 351; thedarubi, 

 protective coloring of, 353. 



Thecophorafovea, 349. 



Theognis, selection in mankind, 33. 



Thendiofi, striclulation of males of, 309; theridion lineatum, 308. 



Titomisas citreus, and 2\ floricolens, difference of color in the sexes 

 of, 307. 



Thompson, J. H., on the battles of sperm-whales, 571. 



Thompson, W., on the coloring of the male char during the 

 breeding-season, 386; on the pugnacity of the males of Gallinula 

 chloropus, 409; on the finding of new mates by magpies, 462; on the 

 finding of new mates by Peregrine falcons, 463. 



Thorax, processes of, in male beetles, 334. 



Tliorell, T., on the proportion of the sexes in spiders, 287. 



Thornback, difference in the teeth of the two sexes of the, 379. 



Thoughts, control of, 139. 



Thrush, pairing with a blackbird, 470; colors and nidification of 

 the, 518. 



Thrushes, characters of young, 518, 529. 



Thug, remorse of a, 133. 



Thumb, absence of, in A teles and Hylobates, 57. 



Thury, M., on the numerical proportion of male and female births 

 among the Jews, 275. 



Ihylacinus, possession of the marsupial sac by the male, 183. 



Thysanura, 317. 



Tibia, dilated, of the male Crdbro cribrarius, 313; and femur, pro- 

 portions of, in the Aymara Indians, 39. 



Tierra del Fuego, marriage-customs of, 683. 



Tiger, colors and markings of the, 622. 



Tigers, depopulation of districts by, in India, 52. 



Tillus elongatus, difference of color in the sexes of, 333. 



Timidity, variability of, in the same species, 78. 



Tinea vulgaris, 282. 



7'ipula, pugnacity of male, 317. 



Tits, sexual difference of color in, 521. 



Toads, 895; male, treatment of ova by some, 185; male, ready to 

 breed before the female, 240. 



Todas, infanticide and proportion of sexes, 288; practice polyandry, 

 677; choice of husbands among, 677. 



Toe, great, condition of, in the human embryo, 12. 



Tomicus villosus, proportion of the sexes in, 286. 



Tomtit, blue, sexual difference of color in the, 521. 



Tonga Islands, beardlesoness of the natives of, 639, 663. 



Tooke, Home, on language, 97. 



Tools, flint, 164; used by monkeys, 91; use of, 54. 



Topnots in birds, 438. 



Tortoise, voice of the male, 646. 



