1911 Encyclopædia Britannica/Groove-toothed Squirrel

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GROOVE-TOOTHED SQUIRREL, a large and brilliantly coloured Bornean squirrel, Rhithrosciurus macrotis, representing a genus by itself distinguished from all other members of the family Sciuridae by having numerous longitudinal grooves on the front surface of the incisor teeth; the molars being of a simpler type than in other members of the family. The tail is large and fox-like, and the ears are tufted and the flanks marked by black and white bands.