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DOLICOCHOCEPHALIC.
INDEX.
EAGLE.
639

with a sick cat, 103; sympathy of, with his master, 103; their possession of conscience, 103; possible use of the hair on the fore-legs of the, 151; races of the, 176; numerical proportion of male and female births in, 246; sexual affection between individuals of, 524; howling at certain notes, 569; rolling in carrion, 530.

  • Dolichocephalic structure, possible cause of, 56.
  • Dolphins, nakedness of, 56.
  • Domestic animals, races of, 176; change of breeds of, 596.
  • Domestication, influence of, in removing the sterility of hybrids, 172
  • D'Orbigny, A., on the influence of dampness and dryness on the colour of the skin, 193; on the Yuracaras, 582.
  • Dotterel, 477.
  • Doubleday, E., on sexual differences in the wings of butterflies, 277.
  • ——, H. on the proportion of the sexes in the smaller moths, 251; males of Lasiocampa quercus and on the attraction of the Saturnia carpini by the female 252; on the proportion of the sexes in the Lepidoptera, 252; on the ticking of Anobium tesselatum, 306; on the structure of Ageronia feronia, 307; on white butterflies alighting upon paper, 317.
  • Douglas, J. W., on the sexual differences of the Hemiptera, 281; on the colours of British Homoptera, 282.
  • Down, of birds, 390.
  • Draco, gular appendages of, 355.
  • Dragonet, Gemmeons, 336.
  • Dragon-flies, caudal appendages of male, 276; relative size of the sexes of, 279; difference in the sexes of, 290; want of pugnacity by the male, 291.
  • Drake, breeding plumage of the, 393.
  • Dreams, 74; a possible source of the belief in spiritual agencies, 94.
  • Drill, sexual difference of colour in the, 538.
  • Dromœus, irroratus, 478.
  • Dromolœa, Saharan species of, 456.
  • Drongo shrike, 461.
  • Drongos, racket-shaped feathers in the tails of, 384, 392.
  • Dryness, of climate, supposed influence of, on the colour of the skin, 193.
  • Dryopithecus, 155.
  • Duck, harlequin, age of mature plumage in the, 483; breeding in immature plumage 484.
  • ——, long-tailed, preference of male, for certain females, 420.
  • ——, pintail, pairing with a wigeon, 414.
  • ——, voice of the, 374; pairing with a shield-drake, 414; immature plumage of the, 466.
  • ——, wild, sexual differences in the 219; speculum and male characters of, 236; pairing with a pintail drake, 415.
  • Ducks, wild, becoming polygamous under partial domestication, 219; dogs and cats recognised by, 412.
  • Dufossé, Dr., sounds produced by fish, 347.
  • Dugong, nakedness of, 56; tusks of, 502.
  • Dujardin, on the relative size of the cerebral ganglia in insects, 54.
  • Duncan, Dr., on the fertility of early marriages, 138; comparative health of married and single, 140.
  • Dupont, M., on the occurrence of the supra-condyloid foramen in the humerus of man, 22.
  • Durand, J. P., on causes of variation, 30.
  • Dureau de la Malle, on the songs of birds, 86; on the acquisition of an air by blackbirds, 370.
  • Dutch, retention of their colour by the, in South Africa, 193.
  • Duty, sense of, 97.
  • Duvaucel, female Hylobates washing her young, 70.
  • Dyaks, pride of, in mere homicide, 117.
  • Dynastes, large size of males of, 279.
  • Dynastini, stridulation of, 303.
  • Dytiscus, dimorphism of females of, 276; grooved elytra of the female, 276.

E.

  • Eagle, young Cercopithecus rescued from, by the troop, 101.
  • ——, white-headed, breeding in immature plumage, 484.