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Show 1871.] DR. J. E GRAY ON THE BRADYPODIDA. 441 is not so harsh as that of the males, and is blackish grey closely white-spotted ; but the colour of the face and throat are the same. A young specimen in the Museum, obtained from Mr. Warwick, has the fur very soft and greyer than in the adult, and therefore the white spots are less distinct; the black postocular spot is small but distinct. It is curious that Dr. J. A. Wagner, in his specific characters of B. cuculliger, particularly marks "stria postoculari nulla." In our specimens it is distinct, but smaller than in B. infuscatus. Variety. Male : the dorsal patch dark orange-yellow with a broad tapering black central streak and a black spot, but with the outer margin of the same colour as the rest of the back, and not intense black as in the other specimen. Hab. . B.M. 2. ARCTOPITHECUS GULARIS. Fur much longer and more flaccid, brownish grey, with large blotches of white on the back. 6*. Bradypus gularis, Riippell, Mus. Senck. 1. 2. 3, p. 138, t. Hab. Surinam (C. Bartlett). Vie have only a skin, without the skull, of a half-grown animal; the length of the fur does not appear to depend upon age, as it is longer than in the female of the more rigid-haired species in the Museum. It may prove to be a distinct species when the skull is observed. Wagner describes B. cuculliger as having coarse, brittle, long whitish-brown hair; and he quotes B. gularis, Riippell, as a synonym of it. Riippell describes his species as " corpore pilis longis laxis;" and further, the hair of three kinds:-first, long, cylindrical, and soft to the feel, mostly of a blackish colour; second, more elongate and perceptibly compressed at the ends, and whitish ; third, fine short woolly hair among the other, grey or white. Our specimen which agrees with this is without the skull; and Riippell does not describe or figure the skull of his specimen; so we do not know if it is like, or different from, A. cuculliger. b. Nose and forehead covered with short soft yellow hair, which is erect at the hinder part of the forehead; cheeks, chin, and throat covered with thin harsher hair, like the rest of the body. L'Ai adulte, Buffon, Hist. Nat. vol. xiii. tab. vi. L'A'i second a dos brule, Daubenton in Buffon's Hist. Nat. vol. xiii. p. 62. Acheus us (us, Lesson, Especes des Mammiferes, p. 271, from Buffon's figure, is a male of a species of this section. The Bradypus ai and B. infuscatus ofWagler, Isis, 1831, pp. 611, 612, and B. pallidus of Wagner, appear to belong to this division ; but I cannot fit them on to any of the specimens in the Museum. 3. ARCTOPITHECUS BLAINVILLEI. B.M. Forehead and temples with short, erect, yellow hair ; chin, checks, |