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Turning to the Old World, the males of Hylobates hoolock are always black, with the exception of a white band over the brows; the females vary from whity-brown to a dark tint mixed with black, but are never wholly black. On Mycetes, Rengger, ibid. s. 14; and Brehm, 'Thierleben, B. i. s. 96, 107. On Ateles Desmarest, 'Mammalogie, p. 75. On Hylobates, Blyth, 'Land and Water, 1867, p. 135.
The terrestrial Carnivora and Insectivora rarely exhibit sexual differences of any kind, including colour. Desmarest, 'Mammalogie, 1820, p. 220. The marine Carnivora or seals, on the other hand, sometimes differ considerably in colour, and they present, as we have already seen, other remarkable sexual differences.
With respect to an allied species, in which there is an equal sexual difference in colour, see Sir S. Baker, 'The Albert Nyanza, 1866, vol. ii. p. 627. For the A. sing-sing, Gray, 'Cat. B. Mus. p. 100. Desmarest, 'Mammalogie, p. 468, on the A. caama. The emasculated bull reverts to the colour of the female.
In the second edition of the 'Regne Animal' , Cuvier infers, from the 'proportions of all the parts' and 'the arrangements of the foramina and sutures of the head, that the Pongo is the adult of the Orang-Utan, 'at least of a very closely allied species, and this conclusion was eventually placed beyond all doubt by Professor Owen's Memoir published in the 'Zoological Transactions' for 1835, and by Temminck in his 'Monographies de Mammalogie'. Temminck's memoir is remarkable for the completeness of the evidence which it affords as to the modification which the form of the Orang undergoes according to age and sex.
In the second edition of the 'Regne Animal' , Cuvier infers, from the 'proportions of all the parts' and 'the arrangements of the foramina and sutures of the head, that the Pongo is the adult of the Orang-Utan, 'at least of a very closely allied species, and this conclusion was eventually placed beyond all doubt by Professor Owen's Memoir published in the 'Zoological Transactions' for 1835, and by Temminck in his 'Monographies de Mammalogie'. Temminck's memoir is remarkable for the completeness of the evidence which it affords as to the modification which the form of the Orang undergoes according to age and sex.
S. Muller, on the Banteng, 'Zoog. Indischen Archipel. 1839-1844, tab. 35; see also Raffles, as quoted by Mr. Blyth, in 'Land and Water, 1867, p. 476. On goats, Dr. Gray, 'Catalogue of the British Museum, p. 146; Desmarest, 'Mammalogie, p. 482.
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