Genus HYLOBATES, Illiger (1811).
Size smaller than that of other anthropoid Apes; the largest species, H. syndactylus, not much exceeding three feet in height. Body and limbs slender; arms, hands, and feet exceedingly long, the arms being so much longer than the legs that the hands reach the ground when these animals stand upright on their feet—a position that is assumed habitually by this genus, and by this alone, amongst the Simiidæ, when walking. Thumb and great toe deeply separated from the next digits. Ischial callosities (naked thickened
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Fig. 1.—Skull of Hylobates lar.
skin on each buttock) present, but small. There are generally 13 pairs of ribs, 5 lumbar, 3 sacral, and 3 or 4 caudal (coccygeal) vertebræ; so that there being, as usual, 7 cervical vertebræ, the vertebral formula is C. 7, D. 13, L. 5, S. 3, C. 3–4.
Dentition: i. 44, c. 1—11—1, pm. 2—22—2, m. 3—33—3.
Synopsis of Indian and Burmese Species.
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A white or grey band across the eyebrows, remainder of head and upper surface of feet and hands the same colour as the body
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H. hoolock, p. 5. |
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Hands, feet, and a ring of hair surrounding the face white or whitish
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H. lar, p. 7. |
1. Hylobates hoolock. The Hoolock or white-browed Gibbon.
- Simia hoolock, Harlan, Trans. Am. Phil. Soc. iv, p. 52, pl. 2 (1834).
- Hylobates hoolock, Blyth, Cat. p. 4; Sclater, P. Z. S. 1870, pl. v, fig. 2; Blyth, Mam. Birds Burma, p. 1; Anderson, An. Zool. Res. p. 1; id. Cat. p. 26.
Uluk, Hindi; Myouk-lwai-gyau and Tuboung, Burmese of Arakan.
