Absarokius Matthew, 1915 † (original description)
Arctostylops Matthew, 1915 † (original description)
Dipsalidictis Matthew, 1915 † (original description)
Grangerella Cockerell, 1915 † (original description)
Hadrosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)
Histriosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)
Leptosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)
Mesosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)
Nothodectes Matthew, 1915 (original description)
Phenacolemur Matthew, 1915 † (original description)
Platylecanium Cockerell & Robinson, 1915 (original description)
Prolimnocyon Matthew, 1915 † (original description)
Schizaspis Cockerell & Robinson, 1915 (original description)
Simosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)
Tetonius Matthew, 1915 † (original description)
Thryptacodon Matthew, 1915 † (original description)
Uintanius Matthew, 1915 † (original description)
Urosciurus Allen, 1915 accepted as Sciurus Linnaeus, 1758 (original description)