I.

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

J.

Jacamars, 105

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