Part 29

Habenaria chlorantha, 230

Habits of humming-birds, 130

Heat due to condensation of atmospheric vapour, 14 changes colours, 183

Heliconiinæ and Acræinæ, local resemblances of, 256

Hindostan and Africa, resemblances of fauna of, 328

Hooker, Sir J. on flowers of Auckland Isles, 238 on deficient odour of New Zealand flowers, 277

Hornbills, 107

Horns of beetles, probable use of, 202

Howling-monkeys, 118

Humming-birds, number of, 124, 133 distinctness of, 125, 129 structure of, 125 colours and ornaments of, 127 descriptive names of, 129 motions and habits of, 130 display of ornaments by males, 134 food of, 135 nests of, 137 geographical distribution and variation of, 138 of Juan Fernandez, 140 influenced by varied conditions in South America, 147 relations and affinities of, 148 sternum of, 151 eggs of, 152 feather-tracts of, 152 resemblance of swifts to, 152 nestlings of, 153 differences from sun-birds, 154

Iguanas, 113

Indian peninsula once an island, 325 ancient fauna of, 325

Insects, wingless, 97 general observations on tropical, 98

Insular plants and insects, relations of, 267

Interference-colours in animals, 184

Islands, influence of locality on colour in, 257

Jacamars, 105

Juan Fernandez, humming-birds of, 140 insects of, 270 abundance of humming-birds in, 273

Land and sea, peculiar distribution of, 311 existing distribution of, very ancient, 312

Leaf-insects, 92

Leaves, supposed use of odours of, 277

Lemuria, an hypothetical continent, not required, 328

Leopoldinia major, 45

Lepidoptera, diurnal, 72

Leptalis, a good case of mimicry, 189

Leptena erastus, 256

Light, theory of, as producing colours, 161 action of, on plants, 222 supposed direct action of, on colours of flowers and fruits, 236

Lizards, 111