Rhembobius Förster, 1869

Watanabe, Kyohei, 2021, Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 50, pp. 55-136 : 93

Genus Rhembobius Förster, 1869

Rhembobius Förster, 1869: 184 . Type: Phygadeuon quadrispinus Gravenhorst, 1829 . Designated by Ashmead (1900a).

Ulothymus Förster, 1869: 185 . Type: Ichneumon perscrutator Thunberg, 1824 . Designated by Perkins (1962)

Acanthocryptus Thomson, 1873: 520 . Type: Phygadeuon quadrispinus Gravenhorst, 1829 .

Original designation.

Two species, Rh. perscrutator ( Thunberg, 1822) and Rh. quadristriatus (Uchida, 1956) , have been recorded from Japan. The latter species is recorded by only a male holotype and I could not find the type. In this study, I record the distributional data of the former below. Japanese species can be distinguished by the following key.

Key to Japanese species of the genus Rhembobius (♀ ♁)

(female of Rh. quadristriatus is unknown)

1. Metasoma entirely black ( Figs 32A, D ), sometimes T II and T III slightly tinged with reddish brown. Legs black ( Fig. 32A ). Body length 5.0–8.0 mm. ................................ Rh. perscrutator ( Thunberg, 1822)

-. Posterior margins of T I, T II, and T III yellowish red. Legs largely yellowish red. Body length 6.5 mm. ................................ Rh. quadristriatus (Uchida, 1956)

Figures

Fig. 32. Rhembobius perscrutator (Thunberg,1822), KPM-NK 81957 (A, C, D) and 81961 (C), females from Japan ―A, lateral habitus; B, head, frontal view; C, fore wing; D, propodeum, T I, and T II, dorsal view.