Index. 789 



dances of, 460; teirao gcoticus, 518, 530, 537; tetrao tetrix, 518, 530, 

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

 battles of, 417; drumming of the male, 426; tetrao urogaZlaides, 

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

 uropha^iatius, inflation of the oesophagus in the male, 423. 



TJuimiiobia, young of, 533. 



Theda, sexual differences of coloring in species of, 351; tTieelarubi, 

 protective coloring of, 353. 



Thecophora fovea, 349. 



Theognis, selection in mankind, 33. 



Therviion, stridulation of males of, 309; theridion lineatum, 308. 



Thomisus citreus, and T. floiHcolens, 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 GaUinula 

 cJdoropus, 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. 



Thorell, 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 Ateles and Hylohates, 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 Crabro 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. 



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



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



Tinea 'vulgaris, 282. 



Tipula, pugnacity of male, 317, 



Tits, sexual difference of color in, 521. 



Toads, 395; 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, beardlessness 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. 



