Homotropus signatus

Homotropus signatus (Gravenhorst, 1829) (Figs 12 A–F) Bassus signatus Gravenhorst, 1829: 325. Tryphon compressiventris Cresson, 1868: 105. Homotropus hygrobius Thomson, 1890: 1524. Homotropus bifoveolatus Kriechbaumer, 1894: 246. Zootrephes montanus Davis, 1895: 24. Homotropus signatus: Dasch, 1964: 164. Homotropus signatus: Townes et al., 1965: 404. Homotropus signatus: Klopfstein, 2014b: 72. Specimens examined. JAPAN: [Hokkaido] 7F10M, Akkeshi Town, Bekanbeushi marsh, 14. VII. 2003, R. Matsumoto leg. (OMNH); 5F, ditto, 12–31 VII 2003, R. Matsumoto leg. (MsT) (OMNH); 1M, ditto, 1. VIII. 2003, R. Matsumoto leg. (OMNH); 5F, ditto, 1–30 VIII 2003, R. Matsumoto leg. (MsT) (OMNH); 11F, ditto, 1–31 VIII 2003, R. Matsumoto leg. (MsT) (OMNH); 2F10M, ditto, 30. VIII. 2003, R. Matsumoto leg. (OMNH); 1F, Nukabira, 1. VII. 1980, K. Maeto leg. (NARO); 1M, Toyokoro Town, Horooka, 17. VI. 2006, K. Watanabe leg. (KPNMH); 1F, Nissho-toge, Sarugawa-river, 31 VII–14 VIII 2010, N. Kuhara leg. (MsT) (EUM); [Honshu] 1M, Nagano Pref., Otaki Vil., Mt. Ontakesan, 13–25 VI 2015, S. Shimizu leg. (KPNMH). GERMANY: 1F (det. E. Diller), Northeim, 8. VIII. 1945, (ZSM); 1M (det. E. Diller), Stolzenau, 8. VIII. 1945, (ZSM). NETHERLANDS: 1F (det. C. J. Zwakhals), St. Pietersberg, 15. VIII. 1986, C. J. Zwakhals leg. (KPNMH); 1F (det. C. J. Zwakhals), Asperen, 12. VIII. 1973, C. J. Zwakhals leg. (KPNMH). Diagnosis. See Klopfstein (2014b). Distribution. Japan (Etorofu Is., Kunashiri Is., Hokkaido, and Honshu). Outside Japan, this species is widely distributed in Holarctic region (Yu et al. 2016). Bionomics. In Japan, Syrphus vitripennis Meigen, 1822 (Diptera, Syrphidae) have been recorded as host (Uchida 1930, 1957). Outside Japan, nine hoverfly species, Epistrophe eligans (Harris, 1780), Neocnemodon vitripennis (Meigen, 1822), Platycheirus fulviventris (Macquart, 1829), Scaeva pyrastri (Linnaeus, 1758), Sphaerophoria cylindrica Say, 1824, Sphaerophoria rueppellii (Wiedemann, 1820), Sphaerophoria scripta (Linnaeus, 1758), Syrphus ornatus Meigen, 1822, Syrphus torvus Osten Sacken, 1875 have been recorded as hosts (Rudow 1908; Rudow 1919; Scott 1939; Dasch 1964; Thirion 1994; Vidal 1997). Adoxophyes orana (Fischer von Röslerstamm, 1834) (Lepidoptera, Tortricidae) and Delia radicum (Linnaeus, 1758) (Diptera, Anthomyiidae) have also been recorded as hosts (Janssen 1958; Constantineanu & Mustata 1973; Mustata 1978; Pisica 1983), but are considered doubtful records. Remarks. This is the first record of this species from Honshu.