YOUNG FEMALE.--Appears to be allied most nearly to _M. lasiotis_. Face narrow and somewhat projecting; eyes bright hazel; face and ears flesh-coloured; a black whisker-like tuft on either cheek; skin of the upper parts tinted with blue, and sparsely covered with hairs of a light grey; hairs of the belly buff; fur of the upper parts greyish-brown, washed with buff, which is lighter on the head, and brick-dust-red round about the rump. Tail, 4½ inches long, blackish; callosities flesh-coloured. (_Swinhoe._) DISTRIBUTION.--China; North Lena Island, and most of the small islands near Hong Kong. HABITS.--Nothing is known of the habits of St. John's Macaque. "Dried bodies of this animal," writes Mr. Swinhoe its describer, "split in two are often exhibited hanging from the ceiling in druggists' shops, in Canton and Hong Kong; and its bones are used for medicinal purposes." XIV. THE FORMOSAN ROCK-MACAQUE. MACACUS CYCLOPIS. _Macacus cyclopis_, Swinh., P. Z. S., 1862, p. 353, pl. xiii., 1864, p. 380; Sclater, P. Z. S., 1864, p. 711 (woodcut); Anderson, Zool. Exped. Yun-nan, p. 87 (1878; with synonymy). {29}_Macacus sancti-johannis_, Gray, Cat. Monkeys, Brit. Mus. App., p. 129 (1870; in part); Scl., P. Z. S., 1871, p. 222. _Macacus rhesus_, Scl., P. Z. S., 1871, p. 222. _Macacus erythræus_, pt. Schl., Mus. Pays-Bas, vii., p. 112 (1876). CHARACTERS.--Allied to _M. rhesus_, but the head round; the face flat, and round; supra-orbital region bare, as in other species; cheeks dark-whiskered; ears small and haired; a strong ruff-like beard; tail stout, thickly haired and tufted, 12 inches long. Fur thick and woolly; hair behind the mouth, and below and behind the ears ringed; hair not longer on the shoulders than on the rest of the body. General colour olive-grey, or slaty; the hairs finely freckled with yellow; no rufous on the lower back and hind quarters; legs dark, and a distinct black line along the top of the tail. The characters of the head, face, whiskers, beard, and the thick tail, and the absence of the rufous colour distinguish it from _M. rhesus_. _M. assamensis_ is redder than _M. rhesus_ or _M. cyclopis_, and has a long head, projecting face, and a short tail. FEMALE.--Smaller and rather lighter coloured than the male. At the love-period the naked posterior parts with the thighs and tail become excessively swollen, and florid. DISTRIBUTION.--The island of Formosa, where it is the only known species of Monkey.