Genus Cryptus Fabricius, 1804

Cryptus Fabricius, 1804: 70 . Type species: Cryptus viduatorius Fabricius, 1804 . Designated by Curtis (1837).

Eucryptus Haldeman, 1842: 191 . New name for Cryptus .

Itamoplex Förster, 1869: 188 . Type species: Cryptus americanus Cresson, 1864 (= Ischnus albitarsis Cresson, 1864). Designated by Viereck (1914).

Plesiocryptus Cameron, 1903b: 299 . Type species: Plesiocryptus carinifrons Cameron, 1903 . Monobasic.

Five species, Cr. dianae (Gravenhorst, 1829), Cr. konoi Uchida, 1936, Cr. lugubris atrifemur (Townes, 1962), Cr. nipponensis Uchida, 1930 and Cr. spiralis (Fourcroy, 1785), have been recorded from Japan.Among them, types of Cr. nipponensis are lost (Townes et al., 1965; Yu et al., 2016). I could not find any specimens with the character states of Cr. nipponensis . I herein describe a new species, Cr. daidaigaster sp. nov., from Hokkaido, Japan and newly record Cr. dianae from Honshu.