A group of large tail-less apes, usually denominated _Gibbons_, or Long-armed Apes, come next in order. These are neither so large nor human-like as the ourang or the chimpanzee; nevertheless, they are capable of walking upon their hind legs, after the manner of bipeds. They are all long-armed apes, and generally use their fore-arms in walking, but more to assist them in clinging to the branches of trees, and swinging themselves from one to the other. The gibbons are all Asiatic monkeys, and inhabit the same countries with the ourang, viz., the tropical forests of India and the Indian Archipelago. There are at least a dozen species of them, nearly half of which are found in the Island of Sumatra alone. The _Proboscis_ monkeys follow the gibbons. These are also long-armed apes, but with tails and sharp proboscis-like snouts, from which their name is derived. Only two species are known--both belonging to the great Island of Borneo, so rich in varieties of these human-like mammalia. One of the species of proboscis monkeys has also been observed in Cochin China. Another large tribe of Asiatic apes, containing in all nearly twenty different species, has been constituted into a genus called _Semnopithecus_. These also inhabit the Indian continent and the great islands; but they are not so exclusively tropical in their habits, since several of the species extend their range northward to Nepaul, and other districts among the Himalaya Mountains. It is a species, or more than one, of these ugly apes that is venerated by the Hindus; and they are permitted to live without molestation in the sacred groves and temples, though they often prove most troublesome protegees to their fanatical benefactors. In Africa, the representatives of this last-mentioned tribe are found in the _Colobus_ monkeys. Of these there are about a dozen species; and from several of them are obtained the long-haired monkey skins of commerce. They are all tropical animals, and inhabit the middle zone of Africa--their range extending from Abyssinia to the shores of the Atlantic. Another very large tribe, containing in all as many as thirty species, and belonging exclusively to Africa, are the _Guenons_. They are closely allied to the colobus monkeys, but yet sufficiently different from them in habits and conformation to be classed into a separate genus. Most of the guenons inhabit the central regions of Africa; but they are not exclusively tropical, since several kinds belong to Kaffraria, and that region indefinitely called the Cape of Good Hope.