Above, ashy-grey, rather paler below; more or less silvery on the back, often rufescent on the rump, with the hairs dark ashy at the roots; dorsal stripe from crown to loins chestnut {35}brown; circle round the eyes dark brown; a white line down the nose between the eyes; oral patch, including the ears, brown. The Slow-Loris varies greatly in size and colour in the different regions it inhabits, and its varieties have been recognised by many naturalists as distinct species. Every shade of colour occurs among specimens from different habitats. The colour varies between rufescent grey, or greyish-rufous, or white (with a brown tinge showing through from below) and silvery grey. The dorsal stripe varies from rufous to dull grey or even black, expanding out, or not, on the crown of the head, arms, and cheeks, bifurcating to the orbital rings and ear-patches, or to one or other only. Sometimes the dorsal stripe and face-markings are wanting altogether. Under side varying from pale rufescent grey to light rufous or dull grey. Length of head and body varying from 12¾ to 16 inches. "It is an interesting fact," observes St. George Mivart, "that as far as concerns the skull and dentition, the Asiatic _Nycticebus_ far more resembles the African _Perodicticus_ than it does its Oriental neighbour _Loris_." DISTRIBUTION.--The Slow-Loris has a comparatively wide and interrupted range. It is common in the dense mountain forests of Assam and Burma (where it has received the distinctive appellation of _N. bengalensis_), as well as in Tenasserim and the Malayan Peninsula. It has also been obtained in Siam and Cochin-China, whence it has been described as a distinct species (_N. cinereus_), from its silvery-grey fur; while it also occurs--somewhat reduced in size--and often (but not invariably) without the upper incisor teeth--in the islands of Sumatra, Java, and Borneo with its surrounding islet groups, {36}as well as in the Philippine Islands. The form from the last-named localities (figured on Plate III.) has generally been recognised as _N. javanicus_; but, from a careful examination of the material in the British Museum, it appears to the present writer that the specimens from all these localities merge so insensibly into each other that it is impossible to separate them into distinct species. The Slow-Loris, though occurring on the north-eastern frontier of India, has not yet been discovered in the Himalayas.