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It accords with this view that even in the same restricted genus both sexes of some species, and the males alone of others, are thus provided. It is also a remarkable fact that, although the females of Antilope bezoartica are normally destitute of horns, Mr. Blyth has seen no less than three females thus furnished; and there was no reason to suppose that they were old or diseased.
These differences in the tusks of the several races and species of elephants the great variability of the horns of deer, as notably in the wild reindeer the occasional presence of horns in the female Antilope Bezoartica, and their frequent absence in the female of Antilocapra americana the presence of two tusks in some few male narwhals the complete absence of tusks in some female walruses are all instances of the extreme variability of secondary sexual characters, and of their liability to differ in closely-allied forms.
The Antilope bezoartica offers a somewhat analogous case: the males have long straight spiral horns, nearly parallel to each other, and directed backwards; the females occasionally bear horns, but these when present are of a very different shape, for they are not spiral, and spreading widely, bend round with the points forwards. Now it is a remarkable fact that, in the castrated male, as Mr.
Anthocharis genutia. Anthocharis sara. Anthophora acervorum, large male of. Anthophora retusa, difference of the sexes in. Anthropidae. Anthus, moulting of. Antics of birds. Antigua, Dr. Nicholson's observations on yellow fever in. Antilocapra americana, horns of. Antilope bezoartica, horned females of; sexual difference in the colour of. Antilope Dorcas and euchore. Antilope euchore, horns of.
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