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hyelaphus.
INDEX.
insectivora.
651
- Hyelaphus porcinus, 546.
- Hygrogonus, 345.
- Hyla, singing species of, 350.
- Hylobates, absence of the thumb in, 51; upright progression of some species of, 52; maternal affection in a, 70; direction of the hair on the arms of species of, 151; females of, less hairy below than males, 558.
- agilis, 51; hair on the arms of, 151; musical voice of the, 527; superciliary ridge of, 558; voice of, 567.
- hoolock, sexual difference of colour in, 537.
- lar, 51; hair on the arms of, 151.
- leuciscus, 51; song of, 568.
- syndactylus, 51; laryngeal sac of, 527.
- Hylophila prasinana, 308.
- Hymenoptera, 291; large size of the cerebral ganglia in, 54; classification of, 148; sexual differences in the wings of, 277; aculeate, relative size of the sexes of, 279.
- Hymenopteron, parasitic, with a sedentary male, 221.
- Hyomoschus aquaticus, 547.
- Hyperythra, proportion of the sexes in, 251.
- Hypogymna dispar, sexual difference of colour in, 316.
- Hypopyra, coloration of, 315.
I.
- Ibex, male, falling on his horns, 508; beard of the, 531.
- Ibis, white, change of colour of naked skin in, during the breeding season, 389; scarlet, young of the, 481.
- tantalus, age of mature plumage in, 483; breeding in immature plumage, 484.
- Ibises, decomposed feathers in, 385; white, 492; and black, 493.
- Ichneumonidæ, difference of the sexes in, 292.
- Ichthyopterygia, 37.
- Ichthyosaurians, 159.
- Idiots,. microcephalous, their characters and habits, 35; hairiness and animal nature of their actions, 36; microcephalous, imitative faculties of, 87.
- Iguana tuberculata, 354.
- Iguanas, 354.
- Illegitimate and legitimate children, proportion of the sexes in, 244.
- Imagination, existence of, in animals, 74.
- Imitation, 68; of man by monkeys, 72; tendency to, in monkeys, microcephalous idiots and savages, 87; influence of, 129.
- Immature plumage of birds, 463, 466.
- Implacentata, 157.
- Implements, employed by monkeys, 81; fashioning of, peculiar to man, 82.
- Impregnation, period of, influence of, upon sex, 245.
- Improvement, progressive, man alone supposed to be capable of, 79.
- Incisor teeth, knocked out or filed by some savages, 575.
- Increase, rate of, 44; necessity of checks in, 47.
- Indecency, hatred of, a modern virtue, 119.
- India, difficulty of distinguishing the native races of, 167; Cyprinidæ of, 343; colour of the beard in races of men of, 558.
- Indian, North American, honoured for scalping a man of another tribe, 117.
- Individuality, in animals, 83.
- Indopicus carlotta, colours of the sexes of, 458.
- Infanticide, prevalence of, 46, 117, 256; supposed cause of, 577; prevalence and causes of, 591 et seq.
- Inferiority, supposed physical, of man, 64.
- Inflammation of the bowels, occurrence of, in Cebus Azaræ, 7.
- Inheritance, 27; of long and short sight, 33; of effects of use of vocal and mental organs, 88; of moral tendencies, 123, 126; laws of, 227; sexual, 232; sexually limited, 444.
- Inquisition, influence of the, 141.
- Insanity, hereditary, 28.
- Insect, fossil, from the Devonian, 289.
- Insectivora, 534; absence of secondary sexual characters in, 218.
