Homotropus sundevalli ( Holmgren, 1858 )

Morishita, Shunsuke & Watanabe, Kyohei, 2025, Review of the genera Homotropus Förster and Syrphoctonus Förster (Hymenoptera, Ichneumonidae, Diplazontinae) from Japan, Zootaxa 5588 (1), pp. 49-76 : 70-72

Homotropus sundevalli ( Holmgren, 1858)

( Figs 13 A–E)

Bassus sundevalli Holmgren, 1858: 364 .

Bassus scabrosus Desvignes, 1862: 217 .

Syrphoctonus enizemopsis Uchida, 1957: 255 . Syn. nov.

Homotropus enizemopsis : Dasch, 1964: 181.

Homotropus sundevalli : Dasch, 1964: 181.

Homotropus enizemopsis : Townes et al., 1965: 403.

Homotropus sundevalli : Klopfstein, 2014: 74.

Specimens examined. JAPAN: [Honshu] 1M, Gunma Pref., Tsumagoi Vil., Kanbara, Takamine-kogen , 3. IX. 2015, K. Watanabe leg. ( KPMNH) ; 1M, Niigata Pref., Nagaoka City, Suyoshi, Mt. Nokogiriyama , 7. VI. 2014, S. Shimizu leg. ( KPMNH) ; 1M, Toyama Pref., Toyama City, Arimine, Inonedani , 15–22 IX 2009, M. Watanabe leg. ( MT) ( KPMNH) ; 1M, Nagano Pref., Otaki Vil., Mt. Ontakesan, Hakkaisan , 5 IX 2022, S. Morishita leg. ( TMNH) ; 1F (holotype), Gifu Pref., Mt. Norikura , 29. VII. 1954, Townes family leg. ( AEI) ; 1M, Gifu Pref., Hirayu , 12. X. 1982, K. Konishi leg. ( NARO) . AUSTRIA: 1F (det. E. Diller), Oberosterreich, Stallburgalm , 4. VIII. 1986, M. Schwarz leg. ( ZSM) . GERMANY: 1M (det. E. Diller), Goslar , 18. VIII. 1948, E. Bauer leg. ( ZSM) .

Diagnosis. See Klopfstein (2014b).

Distribution. Japan (Honshu). Outside Japan, this species is widely distributed in Palearctic region ( Yu et al. 2016).

Bionomics. Host unknown in Japan. Outside of Japan, Epistrophe grossulariae (Meigen 1822) ( Diptera , Syrphidae ) has been recorded as a host ( Rotheray 1986; Thirion 1994). In Japan, adults were collected in broadleaved forests.

Remarks. This is the first record of this species from Japan. Japanese specimens share similar character states with the diagnosis of European specimens proposed by Klopfstein (2014b), while female Japanese specimen (holotype of H. enizemopsis ) differs from European specimens in the following character states: fore coxa entirely black (black with yellow apex in European specimens); mid and hind trochanters, trochantelli, and femora entirely black (orange in European specimens); hind tibia entirely black (yellow or orange with darknened apex in European specimens). However, as no significant differences were found in other character states, we conclude that the observed variation is intraspecific variation within a single species.