Large, big-headed, rather slim rat. Upper parts rather grizzled-black and yellow. Flanks paler. Coat coarse. Dark stripe down center of back may be distinct running from top of the head to the base of the tail. Underside whitish to grayish. Hairs on rump longer and more or less tinged yellow to orange. Feet buffish orange to blackish above. Head large, rather pointed. Whiskers sparse and short. Ears small and rounded, tinged orange. The tail is about 80% of body length, slender, blackish above, pale below. Fur dense, concealing tail rings. No terminal tuft.