This revision is based on re-examination of type material and published records. Of the four species included under Antinoe by Kinberg, 1856, three are referred to Harmothoe Kinberg, 1856, with the type species, A. microps, remaining in the genus. In addition, Antinoe sensu Malmgren, 1865 (not Kinberg), with type species A. sarsi, is referred to Bylgides Chamberlin, 1919 (including Antinoella Augener, 1928, and Antinoana Hartman and Fauchald, 1971). Antinoe includes three species; Bylgides, 10 species, including new species B. annenkovae and B. belfastensis. A new genus and species, Neobylgides scotiensis, is added. Seven species of Harmothoe are described, including new species H. stephensoni and H. discoveryae.