Syrphoctonus tarsatorius

Syrphoctonus tarsatorius (Panzer, 1809) (Figs 22 A, B) Bassus tarsatorius Panzer, 1809: 102. Bassus exsultans Gravenhorst, 1829: 328. Bassus insignis Gravenhorst, 1829: 349 Bassus flavus Desvignes, 1862: 219. Bassus indicus Cameron, 1909: 728 Homotropus eximius Habermehl 1922: 356. Homotropus flavitrochanterus Uchida 1957: 99. Homotropus tarsatorius: Dasch, 1964: 140. Homotropus tarsatorius: Townes et al., 1965: 405. Syrphoctonus tarsatorius: Klopfstein, 2014b: 98. Specimens examined. JAPAN: [Honshu] 1F, Ibaraki Pref., Goka, 12. IV. 1999, M. Uchida leg. (KPMNH); 1F1M, Saitama Pref., Urawa, Tajima, 9. IV. 1999, T. Nambu leg.(KPMNH); 2M, Tokyo, Akiruno City, Ninomiya, Tamagawariverside, 3. III. 2010, K. Watanabe leg. (KPMNH); 1M, Tokyo, Takao, Hikagesawa, Kokesawa, 3. III. 2007, K. Watanabe leg. (KPMNH); 1F, Kanagawa Pref., Ayase City, Yoshioka, Irigaya, 8. IV. 2000, I. Waki leg. (KPMNH); 1F, Kanagawa Pref., Ebina City, Sagamigawa, 30. IV. 2006, M. Oishi & R. Watanabe leg. (KPMNH); 1M, Kanagawa Pref., Atsugi City, 25. IV. 2008, A. Sakai leg. (KPMNH); 1F, Kanagawa Pref., Atsugi City, Nakaogino, 26. IV. 2008, M. Gunji leg. (KPMNH); 1M, Kanagawa Pref., Atsugi City, Sanda, 26. IV. 2008, H. Katahira leg. (KPMNH); 2M, Kanagawa Pref., Hiratsuka City, Mt. Komayama, Shonandaira, 21. IV. 2007, K. Watanabe leg. (KPMNH); 1M, Kanagawa Pref., Miyamae-ku, Sugao-kouen, 26. V. 2001, T. Ishizaki leg. (KPMNH); 1F, Kanagawa Pref., Hadano City, Mt. Koubouyama, 5. IV. 2007, K. Watanabe leg. (KPMNH); 1M, ditto, 15. IV. 2007, K. Watanabe leg. (KPMNH); 1F, ditto, 29. IV. 2007, K. Watanabe leg. (KPMNH); 1M, ditto, 6. IV. 2008, K. Watanabe leg. (KPMNH); 1F1M, ditto, 12. IV. 2008, K. Watanabe leg. (KPMNH); 1F4M, ditto, 18. IV. 2010, K. Watanabe leg. (KPMNH); 1M, Shizuoka Pref., Higashiizu Town, Inatori, 19. III. 2009, T. Muraki leg. (KPMNH); 3F, Nagano Pref., Otaki Vil., Mt. Ontakesan, Hakkaisan, 5. VIII. 2010, K. Watanabe leg. (KPNMH); 9F, ditto, 6. VIII. 2010, K. Watanabe leg. (KPNMH); 1F, ditto, 7. VIII. 2010, K. Watanabe leg. (KPNMH); 6F, ditto, 8. VIII. 2010, K. Watanabe leg. (KPNMH); 33F2M, ditto, 5–9 VIII 2010, K. Watanabe leg. (KPNMH); [Amami Isls.] 1M, Kagoshima Pref., Tokunoshima Is., Isen-cho, Nakayama, 21. III. 2008, K. Watanabe leg. (KPNMH). Diagnosis. See Klopfstein (2014b). Distribution. Japan (Hokkaido, Honshu, Shikoku, Kyushu, Hachijojima Is., Izuoshima Is., Amamioshima Is., and Tokunoshima Is.). Outside Japan, this species is widely distributed in Holarctic region (Yu et al. 2016). Bionomics. This species was collected by light trap (Yang et al. 2006). In Japan, adults were collected in broadleaved forests and grasslands. In Japan, three hoverfly species, Epistrophe omogensis (Siraki & Edashige, 1953), Metasyrphus frequens Matsumura, 1917, Syrphus vitripennis Meigen, 1822 have been recorded as host (Uchida 1957; Minamikawa 1969). Outside Japan, 15 hoverfly species, Epistrophe euchroma (Kowarz, 1885), Episyrphus balteatus (De Geer, 1776), Eupeodes corollae (Fabricius, 1794), Eupeodes luniger (Meigen, 1822), Eupeodes nitens (Zetterstedt, 1843), Melanostoma mellinum (Linnaeus, 1758), Neocnemodon vitripennis (Meigen, 1822), Paragus quadrifasciatus Meigen, 1822, Platycheirus albimanus (Fabricius, 1781), Platycheirus scutatus (Meigen, 1822), Scaeva pyrastri (Linnaeus, 1758), Sphaerophoria scripta (Linnaeus, 1758), Dasysyrphus venustus (Meigen, 1822), Syrphus ribesii (Linnaeus, 1758), Syrphus torvus Osten Sacken, 1875 have been recorded as hosts (Cameron 1913; Coulon 1934; Dusek, Laska & Sedivy 1979; Goidanich 1928; Hedwig 1950; Horstmann 1970; Kettner 1970; Ngamo, Delabye, Stilmant & Hance 1998; Pisica & Petcu 1972; Pisica 1983; Pschorn-Walcher & Zwölfer 1956; Salt 1936; Scott 1939; Thirion 1994; Wnuk 1974). Anthonomus pomorum (Linnaeus, 1758) (Coleoptera, Curculionidae) and Coccinella septempunctata Linnaeus, 1758 (Coleoptera, Coccinellinae) have also been recorded as hosts (Keler 1940; Schaefer & Semyanov 1992), but are considered doubtful records. Remarks. This is the first record of this species from Tokunoshima Island.