Rhembobius perscrutator (Thunberg, 1822)

(SJN: Tsuya-chibi-togari-himebachi)

(Figs 32A–D)

Ichneumon perscrutator Thunberg, 1822: 257 .

Cryptus basalis Smith, 1874: 392 .

Acanthocryptus nigrita mesocastaneus Constantineanu, 1929: 522 .

Description. See Horstmann (2000).

Materials examined. JAPAN: KPM-NK 81959, F, Saitama Pref., Yorii town, 27. V. 2013, T. Nambu leg.; KPM-NK 81957, F, Kanagawa Pref., Yokosuka City, Mt. Miura-fuji to Mt. Takeyama, 13. VII. 2008, K. Watanabe leg. ; KPM-NK 81956, 81960, F & M, Niigata Pref., Nagaoka City, Urase Town, 7–23. VI. 2015, R. Shimizu et al. leg. (MsT) ; KPM-NK 81958, F, Toyama Pref., Toyama City, Arimine, Inonedani, 28. VII. – 4. VIII. 2009, M. Watanabe et al. leg. (MsT) ; KPM-NK 81961, F, Osaka Pref., Higashiosaka City, Hiraoka-park, 1. VI. 2012, K. Watanabe leg. ; NHMUK, F (type of Cryptus basalis), “ Hiogo ”. GERMANY: ZSM, F (det. Sawoniewicz), Blankenburg, Schmiedeknecht leg. SLOVENIA: ZSM, F (det. Sawoniewicz), Rogaška, Slatina, 4. VII. 1938, E. Bauer leg.

Distribution. Japan (Kunashiri Is., Hokkaido, Honshu, and Shikoku); widely distributed in Palearctic region (Yu et al., 2016).

Bionomics. Unknown in Japan. In Europe, some species of Syrphidae ( Diptera) have been recorded as the host (Yu et al., 2016).