Key to Japanese species of the genus Trychosis

(Female only)

1. Antenna with a white band (Figs 15A, B).................................................................2

-. Antenna without a white band. ………….......................................………..3

2. Ovipositor sheath 0.45 × as long as hind tibia. Lateral aspect of pronotum without longitudinal striae except for short striae along posterior margin. Palpi blackish brown to black except for second and third segments of maxillary palpus with yellow area. Hind tarsus with TS II to TS IV white. …………………… T. maruyamana (Uchida, 1930)

-. Ovipositor sheath 0.29–0.33 × as long as hind tibia. Lateral aspect of pronotum largely covered with longitudinal striae (Fig. 15D). Palpi and hind tarsus entirely blackish brown to black (Fig. 15A). ........................................... T. breviterebratus sp. nov.

3. T1 3.7 × as long as maximum width. Ovipositor sheath 0.5–0.55 × as long as hind tibia. Ramulus absent. Body length usually shorter than 7.0 mm. .................................... T. tokioensis (Uchida, 1930)

-. T1 2.8–3.4 × as long as maximum width. Ovipositor sheath 0.65–0.8 × as long as hind tibia. Ramulus usually present. Body length usually longer than 7.5 mm. ..................................... T. yezoensis (Uchida, 1930)