"Although among the many closely allied species of _Semnopithecus_ it is difficult to be at all sure of their mutual affinities, it would seem that _S. natunæ_ is most nearly related to _S. femoralis_, Horsf., and _S. siamensis_, M. and S. Both of these have a similar arrangement of the hairs on the crown and nape; and, on the other hand, the former possesses the wholly black hands, feet, and tail of _S. natunæ_, and to a certain extent the browner tint of the back, while, on the other, _S. siamensis_ has its whitish under side and light thigh-patch, although united with a widely different coloration." HABITS.--Mr. Everett gives the following note: "Native name 'K[)e]káh,' which is onomatopoeic. These animals were common about the base of Mount Ranai, going in troops, and they commit great depredations on the native gardens. The irides are light cinnamon-brown; face livid black, the eyelids and muzzle, {131}white; feet and hands very dark brown; the ears blackish externally, the outer edge and interior dull white, marbled to some extent with livid blackish spots. In an immature individual, barely half-grown, the white of the eyelids, nose, and chin was tinged with dull pink; and at the exterior angle of each orbit was a bare spot of bluish-white, showing very distinctly, owing to its different tinge of colour, the skin of the face otherwise being livid black. With maturity these naked white spots at the angle of the orbits disappear. I kept this animal alive, intending to bring it home, but it succumbed to the severity of our return passage. It fed on the leaves of sweet potatoes and tapioca, and, although it had been recently captured, in a few days it was very gentle and timid. The breeding-season with these Monkeys is either very prolonged, or is not defined at all, for I obtained them in October, when the rains were beginning, in all stages, from a foetus three inches long, to half-grown specimens." XXII. PHAYRE'S LANGUR. SEMNOPITHECUS PHAYRII. _Semnopithecus obscurus_ (nec Reid), Blyth, J. A. S. Beng., xiii., p. 466 (1844). _Presbytis phayrei_, Blyth, _op. cit._, xvi., p. 733, pl. xxxvii., fig. 3 (1847); Wagner in Schreb. Säugeth. Suppl. v., p. 28 (1855); Tickell, J. A. S. Beng., xxviii., p. 428 (1859). _Semnopithecus argentatus_, Blyth in Horsf. Cat. Mamm. E. I. Co. Mus., p. 7 (1851). _Presbytis cristatus_, Raffl. apud Blyth, Mamm. Burma, p. 9 (nec Raffles). _Semnopithecus rubicundus_, var. _C._, Gray, Cat. Monkeys Brit. Mus., p. 17 (1870). {132}_Semnopithecus phayrei_, Anderson, Zool. Res. Exped. Yun-nan, p. 34 (1878); id., Cat. Mamm. As. Soc. Beng., p. 49; Schl., Mus. Pays-Bas, vii., p. 33 (1876); Blanford, Faun. Brit. Ind., Mamm., p. 39 (1891).