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I owe this information to Mr. Gould, who has given me the following more striking and as yet unpublished case. Two humming-birds belonging to the genus Eustephanus, both beautifully coloured, inhabit the small island of Juan Fernandez, and have always been ranked as specifically distinct.
Two humming-birds belonging to the genus Eustephanus, which inhabit the island of Juan Fernandez, were long thought to be specifically distinct, but are now known, as Mr. Gould informs me, to be the male and female of the same species, and they differ slightly in the form of the beak.
Eustephanus, sexual differences of species of; young of. Exaggeration of natural characters by man. Exogamy. Experience, acquisition of, by animals. Expression, resemblances in, between man and the apes. Extinction of races, causes of. Eye, destruction of the; change of position in; obliquity of, regarded as a beauty by the Chinese and Japanese.
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