The dun-coloured gibbon (_Hylobates entelloides_, Is. Geoff. Saint-Hilaire) is so called from its coat, which is thick and woolly, and furnished with long hairs of a greyish yellow or dun colour. This coat is somewhat darker on the inner surface of the arms and on the neck, where it shades into reddish yellow. The growth of hair surrounding the face is lighter, verging upon white. The female is generally more yellow in colour than the male, and the hair on her face is of a reddish yellow rather than white, but not without a trace of white hairs. The face and the bare places on the hands and feet are black. Between the second and third toes there is a connective web reaching as far as the first joints. This animal inhabits the Malacca peninsula. The name of the species is derived from its assumed likeness to the Indian hanuman (_Semnopithecus Entellus_, F. Cuvier), of which an illustration is given in the background to the right of Fig. 14. The white-bearded gibbon (_Hylobates leucogenys_, Ogilby[9]) is remarkable for the long, erect hairs which grow on the upper and back part of the scalp, and for the long white beard on the cheeks and chin, which joins the thick growth above the eyes. The rest of the body is dark black. Its native place is doubtful. The general colour of the tufted gibbon (_Hylobates pileatus_, J. E. Gray) is black, shading into grey on the shoulders, back, and thighs. A white ring surrounds the hands, feet, face, and scalp; and there is also a patch of white on the sexual organs, and often a patch of black on the breast. The whiskers are black. In other respects the animal varies according to its sex and age. It is found in Siam and Kambodja.[10] The dark grey gibbon (_Hylobates funereus_, Is. Geoff. Saint-Hilaire) is of an ashen grey colour on the upper and outer side of its limbs, verging into brown; and on the under side it is dark brown. There is a narrow strip of light grey round the face, with a darker band round the back of the head. It is found in the island of Sulu.[11] In addition to these species of gibbons of which we have given a brief account, there are several others--as, for example, _Hylobates concolor_ (Harlan), from Borneo; _H. Muelleri_ (L. Martin), from the same place; _H. choromandus_ (Ogilby), from India, and many others. But since our space is limited, the description given above must suffice for a diagnosis of the species. CHAPTER III. THE EXTERNAL AND ANATOMICAL STRUCTURE OF ANTHROPOID APES, COMPARED WITH THE HUMAN STRUCTURE.