Genus Gambrus Förster, 1869

Kaltenbachia Förster, 1869: 187 . Type species: Cryptus ornatus Gravenhorst, 1829 (= Ichneumon incubitor Linnaeus, 1758). Designated by Viereck (1914).

Gambrus Förster, 1869: 188 . Type species: Gambrus (Cryptus) maculatus Brischke, 1888 (= Ichneumon incubitor Linnaeus, 1758). Included by Brischke (1888).

Hygrocryptus Thomson, 1873: 472, 513. Type species: Cryptus carnifex Gravenhorst, 1829 . Designated by Viereck (1914).

Allocryptus Viereck, 1917: 333. Type species: Agrothereutes (Allocryptus) hyslopi Viereck, 1917 (= Cryptus ultimus Cresson, 1864). Monobasic.

Three species, Ga. ruficoxatus (Sonan, 1930), Ga. variator (Walker, 1874) and Ga. wadai (Uchida, 1936), have been recorded from Japan. I herein transfer the generic position of Ischnus homonae (Sonan, 1930) from Ischnus Gravenhorst, 1829, to this genus (comb. rev.) and redescribe this species including previously unknown males.