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Show 598 DR. J. E. GRAY ON AUSTRALASIAN RATS. [May 23, Mus (GYMNOMYS) CELEBENSIS. Grey brown, with rather rigid blackish longer hairs, most abundant on the middle of the back and rump ; sides of the nose, cheeks, chin, middle of the throat, chest, underside of the body, and legs pure white, divided from the dark colour of the upper part of the body by a well-marked line ; tail elongate, basal third blackish, the rest yellow ; feet slender, brown, covered with short soft hair above ; ears rather broad, naked. Length 10 inches, of tail 11 inches, of hind foot about 1 inch 10 lines. (Female.) Hab. Menado (North Celebes), 1859 (Wallace). Mr. Wallace obtained at Sadong, in Borneo, in 1855, a female Rat similar to the above in size, but varied with yellow and black hairs above, whitish yellow below, and with an entirely black tail. The cutting-teeth are yellow and smooth ; the lower one without any indication of a longitudinal grove. Mus XANTHURA. (Yellow-tailed Forest-Rat.) Fur above yellow grey brown, yellow- and black-washed, especially on the hinder part of the back; sides of nose, cheeks, chin, throat, chest, underside of body, and limbs white ; the longer hairs of the back black, rather rigid, those of the hinder part of the back much longer, blacker, and projecting beyond the base of the tail; the hair of the sides of the vent longer, yellow, with some stiffer longer black hairs intermixed ; feet dark brown, hairy above ; tail elongate, nearly naked, only with a few short hairs near the tip, black at the base for about one-third of its length, the rest yellow ; upper cutting-teeth flat and yellow in front; the lower very narrow, rather compressed, white, smooth, without any indication of a central longitudinal groove. Hab. North Celebes; Tondano (Wallace), 1859, female. Mr. Wallace observes, " This is a forest-rat, eats rice ; was taken at an elevation of 3600 feet." The long black hair over the rump has an inclination to form two dark streaks, each ending in a black point on the sides of the base of tbe tail. ACANTHOMYS LEUCOPUS. Grey brown above ; sides of nose, cheeks, chin, underside of body, and legs white ; feet thick, large, white, slightly covered with short close-pressed white hairs; tail elongate, naked, black, with two or more yellow rings. The fur of the back with abundant flat, channelled, spinous hairs, and with a few scattered, elongate, black, cylindrical bristles. The fur of the underside with similar spinous hairs, those on the sides and back being often dark-tipped. The cutting-teeth are yellow and quite smooth in front; the upper ones are flat; the lower ones rather narrow and rounded in front. The ears are nearly naked. The whiskers moderate, slender, flexible, weak. Eyes small. Hab. North Australia ; Cape York (Mr. Damen). There is an adult female of this species, with four lateral ventral |