Differs from the true _P. verreauxi_ in having the face and ears black, and the body otherwise entirely grey, or white, washed more or less with yellow (sometimes rufous on the limbs); or of an ashy-grey colour on the loins, neck, and outer aspect of the limbs; the under side bright rufous; chest and inner sides of the limbs rusty-white, with a fulvous spot at the base of the tail. Specimens from the forests of the interior have a grey spot on the back of the neck expanding into a collar, which is absent in those from the coast. An albino variety comes, so far as is at present known, only from the wooded belts on the extensive plains between the rivers Manambolo and Manjaray, on the west coast. {102}COQUEREL'S SIFAKA. PROPITHECUS COQUERELI. (_Plate XI._) Has the face naked and black, but the centre of the nose white; the ears showing as black points amid the white hair; head and back of neck white, slightly washed with yellow; outer side of arm and fore-arm dark maroon-red, the lower border fringed with long white hair; a maroon patch on the upper and outer surface of the thighs, lighter on the chest and central part of the belly. Loins dark rusty-grey; hands white; tail rusty-grey. DISTRIBUTION.--Verreaux's Sifaka, with its two varieties, is confined to the small thin woods on the sandy and almost rain-less plains along the western and southern coasts of Madagascar. The type-form is found, alone, and unassociated, in the extensive plains of Mesozoic geological formation--between the southern base of the eastern range of mountains and the River Tsidsubon, which flows into the sea on the west coast. Von der Decken's Sifaka inhabits the middle of the west coast, while Coquerel's Sifaka has its home further to the north. It occupies the area between the south side of Narendry Bay and the north side of Bembatoka Bay, the Betsiboka River being its extreme southern limit. Though first observed by Flacourt, and described by him in 1661, Verreaux's Sifaka remained practically unknown from that time till re-discovered by M. Grandidier in 1867. III. THE CROWNED SIFAKA. PROPITHECUS CORONATUS. _Propithecus coronatus_, Milne-Edwards, Rev. Scient., 1871, p. 224; id. et Grandid., Hist. Nat. Madag., Mamm., i., p. 316 (with full synonymy), Atlas, pl. 7. PLATE XI. [Illustration: COQUEREL'S SIFAKA.] {103}CHARACTERS.--Muzzle very broad and naked; nose-pad wide; inside of ears naked. Face, top of head, sides of neck, and throat, deep brownish-black; muzzle black; a band across the temples, and a streak down the nose, white. Ears black inside, fringed externally with white; neck and upper surface white, washed with rust-colour on the limbs and root of the tail. Tail, hands, and feet, pure white. Under side rich orange-red, darker across the chest; inside of limbs white, washed with rufous. Of the same size as _P. verreauxi_.