402 



INDEX. 



Douglas, J. "W., on the sexual differences 

 of the Hemiptera, i. 339 ; on the colors 

 of British Homoptera, i. 341. 



Down, of birds, ii. 77. 



Draco, gular appendages of, ii. 31. 



Dragonet, Geinmeous, ii. 7. 



Dragon-flies, caudal appendages of male, 

 i. 334 ; relative size of the sexes of, i. 337 ; 

 difference in the sexes of, i. 351 ; want of 

 pugnacity by the male, i. 353. 



Drake, breeding plumage of the, ii. 81. 



Dreams, i. 44 ; a possible source of the be- 

 lief in spiritual agencies, i. 64. 



Drill, sexual difference of color in the, ii. 

 5578. 



Drotnmits irroratus, ii. 196. 



DrcHiiolcea. Saharan species of, ii. 164. 



Drongo shrike, ii. 171. 



Drongos, racket-shaped feathers in the 

 tails of, ii. 70, SO. 



Dryness, of climate, supposed influence of, 

 on the color of the skin, i. 233. 



Dryopithecus, i. 191. 



Duck, harlequin, age of mature plumage in 

 the, ii. 204 ; breeding in immature plu- 

 mage, ii. 205. 



Duck, long-tailed, preference of male, for 

 certain females, ii. 117. 



Duck, pintail, pairing with a wigeon, ii. 

 109. 



Duck, voice of the, ii. 57 ; pairing with a 

 shield-drake, ii. 109 ; immature plumage 

 of the, ii. 180. 



Duck, wild, sexual differences in the, i. 

 260; speculum and male characters of, 

 i. 2S1 ; pairing with a pintail drake, ii. 

 110. 



Ducks, dogs and cats recognized by, ii. 106 ; 

 wild, becoming polygamous under partial 

 domestication, i. 261. 



Dugong, tusks .of, ii. 231 ; nakedness of, i. 

 142. 



Dujardin, on the relative size of the cere- 

 bral ganglia in insects, i. 139. 



Duncan, Dr.. on the fertility of early mar- 

 riages, i. 167. 



Dupont, M., on the occurrence of the su- 

 pra-condyloid foramen in the humerus 

 of man, i. 28. 



Durand, J. P., on causes of variation, i. 109. 



Dureau de la Malle, on the songs of birds, 

 i. 53 ; on the acquisition of an air by black- 

 birds, ii. 52. 



Dutch, retention of their color by the, in 

 South Africa, i. 233. 



Duty, sense of, i. 67. 



Duvaucel, female ITylobates washing her 

 young, i. 39. 



Dyaks, pride of, in mere homicide, i. 90. 



Dynastes, large size of males of, i. 337. 



Dynastini, stridulation of, i. 309. 



Vytiscus, dimorphism of females of, i. 333; 

 grooved, elytra of the female, i. 333. 



E. 



Eagle, young Cercopithecus rescued from, 

 by the troop, i. 72. 



Eagle, white-headed, breeding in imma- 

 ture plumage, ii. 205. 



Eagles, golden, new mates found by, ii. 

 100. 



Ear, motion of the, i. 20 ; external shell of 

 ' the, useless in man, i. 21 ; rudimentary 

 point of the, in man, i. 21. 



Ears, piercing and ornamentation of the, 

 ii. 325. 



Echidna, i. 193. 



Echini, bright colors of some, i. 313. 



Echinodermata, absence of secondary sex- 

 ual characters in, i. 312. 



Ecker, figure of the human embryo, i. 15 ; 

 on sexual differences in the pelvis in man, 

 ii. 302 ; on the presence of a sagittal crest 

 in Australians, ii. 804. 



Edentata, former wide range of, in Amer- 

 ica, i. 211 ; absence of secondary sexual 

 characters in, i. 259. 



Edolius, racket-shaped feathers in, ii. 70. 



Edwards, Mr., on the proportion of the 

 sexes in North American species of Pa- 

 pilio, i. 301. 



Egerton, Sir P., on the use of the antlers 

 of deer, ii. 241 ; on the pairing of red deer, 

 ii. 257 ; on the bellowing of stags, ii. 261. 



Eggs, hatched by male fishes, ii. 19. 



Egret, Indian, sexes and young of, ii. 208. 



Egrets, breeding plumage of, ii. 78 ; white, 

 ii. 218. 



Ehrenberg, on the mane of the male Ha- 

 madryas baboon, ii. 255. 



Ekstrom, M., on Harelda glacialis, ii. 117. 



Elachista rufocinerea, habits of male, i. 

 303. 



Eland, development of the horns of the, i. 

 280. 



Elands, sexual differences of color in, ii. 

 274. 



Elaphomyia, sexual differences in, i. 338. 



Elaphmis uliginosiis, stridulation of, i. 368. 



Elaps, ii. 30. 



Elaterldje, proportions of the sexes in, i. 

 305. 



Elaters, luminous, i. 335. 



Elephant, i. 193 ; nakedness of the, i. 145 ; 

 rate of increase . of the, i. 130 ; Indian, 

 polygamous habits of the, i. 259 ; pugna- 

 city of the male, ii. 229 ; tusks of, ii. 231, 

 232, 237, 247 ; Indian, mode of fighting, 

 of the, ii. 245 ; male, odor emitted by the, 

 ii. 266 ; attacking white or gray horses, 

 ii. 2S1. 



Elevation of abode, modifying influence 

 of, i. 116. 



Elimination of inferior individuals, i. 165. 



Elk, ii. 237 ; winter change of the, ii. 2S4. 



Elk, Irish, horns of the, ii. 247. 



Ellice Islands, beards of the natives, ii. 

 307, 333. 



Elliot, E., on the numerical proportion of 

 the sexes in young rata, i. 296 ; on the 

 proportion of the sexes in sheep, i. 296. 



Elliott, D. G., on Pelecanus erythro- 

 rhynch u,% ii. 77. 



Elliott. Sir "W., on the polygamous hah 

 ita of the Indian wild-boar, i. 259. 



