Genus Gnotus Förster, 1869

Gnotus Förster, 1869: 179 . Type: Hemiteles tenuicornis Gravenhorst, 1829 (= Phygadeuon tenuipes Gravenhorst, 1829). Designated by Perkins (1962).

Three species, Gn. chionops (Gravenhorst, 1829), Gn. hyperae Kusigemati, 1990, and Gn. striatus (Uchida, 1930), have been recorded from Japan. In this study, I re-describe Gn. chionops (Gravenhorst, 1829) and Gn. striatus (Uchida, 1930) with some distributional data. Japanese species can be distinguished by the following key.

Key to Japanese species of the genus Gnotus (♀)

1. Body and legs largely black (Figs 51A, D). Pronotum and mesopleuron largely smooth. Fore wing with a clouded area (Fig. 51A). ................................................ Gn. striatus (Uchida, 1930)

-. Body and legs at least partly with reddish brown area (Figs 50A, C). Pronotum and mesopleuron more or less sculptured. Fore wing without a clouded area (Fig. 50A). ........................................................................................... 2

2. Upper tooth of mandible 3.0 times as long as lower tooth (Fig. 62L). Ovipositor sheath almost as long as hind tibia. Anterior margin of clypeus truncate (Fig. 50C). T IV black, at most tinged with dark reddish brown (Fig. 50C). ..................................... Gn. chionops (Gravenhorst, 1829)

-. Upper tooth of mandible less than 2.0 times as long as lower tooth. Ovipositor sheath shorter than hind tibia. Anterior margin of clypeus rounded. T IV reddish brown. ........................................... Gn. hyperae Kusigemati, 1990