INDEX. 



429 



Didffl, i. 805 ; on the relative size of the 

 sexes of Aculeate Hymenoptera, i. 337 ; 

 on the difference between the sexes of 

 ants and bees, i. 354 ; on the stridulation 

 of Trcm sabulosns, i. 369 ; on the strid- 

 ulation of Mononychiis pseudacofi, i. 

 371. 



Smynthnrus hifev.% courtship o£ i. 338. 



Snakes, sexual differences of, ii. 2S ; male, 

 ardency of, ii. 29. 



" Snaeling JicscLEs," i. 122. 



Snipe, drumming of the, ii. 60 ; coloration 

 ofthe, Ii. 216. 



Snipe, painted, sexes and young of, ii. 

 193. 



Snipe, solitary, assembhes of, ii. 97. 



Snipes, arrival of male before the female, 

 i. 251 ; pugnacity of male, ii. 41 ; double 

 moult in, ii. 77. 



Snow-goose, whiteness ofthe, ii. 218. 



Social animals, aft'oetiou of, for each other, 

 i. 73 ; defence o^ by the males, 1. 79. 



Sociability, the sense of duty connected 

 ■with, i. 68 ; impulse to, in animals, 1. 76, 

 77 ; manifestations o^ in man, i. 81 ; in- 

 stinct of, in animals, i. 82, S3. 



SociALixy, probable, of primeval men, i. 

 149 ; influence of, on the development of 

 the intellectual faculties, i. 154 ; origin o^ 

 In man, i. 155. 



SoLDiEEs, American, measurements o^ i. 

 108. 



Soldiers and sailors, difference in the pro- 

 portions of^ i. 110. 



Solenoatoma, bright colors and marsupial 

 sack ofthe females of, ii. 21. 



Song of male birds appreciated by their 

 females, i. 61 ; want of, in brilliant- 

 plumaged birds, ii. 90 ; of birds, ii. 156. 



Sorex, odor ot; ii. 266. 



Sounds admu-ed alike by man and ani- 

 mals, i. 62 ; produced by fishes, ii. 22 ; 

 produced by male frogs and toads, ii. 25; 

 instrumentally produced by bh-ds, ii. 61, 

 et seqq. 



Spain, decadence of, i. 171. 



Sparassus »maragdnliw, difference of 

 color in the sexes of, i. 328. 



Spakbow, pugnacity of the male, ii. 38 ; 

 acquisition of the Linnefs song by a, ii. 

 52 ; coloration of the, ii. ISO ; immature 

 plumage of the, ii. ISO. 



Sparrow, white-crowned, young of the, 

 ii. 208. 



Sparrows, house- and tree-, ii. 162. 



Sparrows, new mates found by, ii. 101. 



Sparrows, sexes and young of, ii. 203 ; 

 learning to sing, ii. 319. 



Spathura Underwoodi, ii. 74. 



Spawning of fishes, ii. 15, IS. 



Spear, origin ofthe, i. 225. 



Species, causes of the advancement of, i. 

 165; distinctive characters of, i. 200; or 

 races of m.an, i. 209 ; sterility and fertil- 

 ity ot, when crossed, i. 214 ; supposed, 

 of man, i. 218 ; gradation of, i. 218 ; diffi- 

 culty of defining, i. 219 ; representative, 

 of bu'ds, ii. 182, 1S3 ; of birds, compara- 



tive differences between the sexes of dis- 

 tinct, ii. 184. 



Spectre-insects, mimicry of leaves by, i. 

 401. 



/Spectrum femoratum, difference of color 

 in the sexes of, i. 350. 



Speech, connection between the brain and 

 the feculty of i. 56. 



" Spel " of the black-cock, ii. 58. 



Spencer, Herbert, on the dawn of intelh- 

 gence, i. 36 ; on the origin of the behef in 

 spiritual agencies, 1. 63 ; on the origin of 

 the moral sense, i. 97 ; on the influence 

 of food on the size of the jaws, i. 113; on 

 the ratio between individuation and gene- 

 sis, i. 310; on music, ii. 320. 



Sperm-wuales, battles of male, ii. 229. 



Spihngid.e, coloration ofthe, i. 383. 



Sphinx, Humming-bii-d, i. 387. 



iSphinx, Mr. Bates on the caterpillar of a, 

 i. 402. 



Spiders, i. 327 ; male, more active than fe- 

 male, i. 263 ; proportion of the sexes in, i. 

 306 ; male, small size of, i. 328. 



Spilosoma menthrasti, rejected by tur- 

 keys, i. 386. 



Spine, alteration of, to suit the erect atti- 

 tude of man, i. 13S. 



Spirits, fondness of monkeys for, i. 12. 



Spiritual agencies, behef in, almost uni- 

 versal, i. 62. 



Spoonbill, ii. 57 ; Chinese, change of plu- 

 mage in, ii. 171. 



Spots, retained throughout groups of buds, 

 ii. 126 ; disappearance ot, in adult mam- 

 mals, ii. 288. 



Sprengel, C. K., on the sexuaUty of plants, 

 i. 252. .> 1- . 



Spring-boc, horns ofthe, ii. 239. 



Sproat, Mr., on the extinction of savages 

 in Vancouver Island, i. 230 ; on the eradi- 

 cation of facial hah' by the natives of V:m- 

 couver Island, ii. 332 ; on the eradication 

 of the beard by the Indians of Vancouver 

 Island, ii. 363. 



Spurs, occun-ence of; in female fowls, i. 

 271, 275 ; development oi^ in various spe- 

 cies of Phasianidaj, i. 281 ; of Gallinaceous 

 birds, ii. 41, 43; development ot; in fe- 

 male Gallinaceae, ii. 155. 



Squilla, dhfferent colors of the sexes of a 

 species ot; i. 326. 



Squirrels, battles of male, ii. 228 ; Afl-ican, 

 sexual differences in the coloring ot; ii. 

 272 ; black, ii. 280. 



Stag, long hau-s of the throat of, ii. 256; 

 horns of the, i. 270, 273 ; battles of, ii. 

 229 ; horns ofthe, with numerous bnonch 

 es, ii. 241 ; beUo^^'ing of the, ii. 201 ; crest 

 of the, ii. 263. 



Stag-beetle, large size of male, i. 836; 

 weapons of the male, i. 364; numerical 

 proportion of sexes ot; i. 305. 



Stainton, H. T., on the numei-ical propor- 

 tion of the sexes in the smaller moths, i. 

 302 ; habits of Elachista rufocinerea, i. 

 303; on the coloration of moths, i. 384; 

 on the rejection of Spilosoma menthroH 



