Homotropus infuscatus ( Uchida, 1957 )

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 : 59

Homotropus infuscatus ( Uchida, 1957)

( Figs 6 A–G )

Syrphoctonus infuscatus Uchida, 1957: 260 .

Homotropus infuscatus : Dasch, 1964: 164.

Homotropus infuscatus : Townes et al., 1965: 404.

Specimens examined. JAPAN: [Hokkaido] 1F, Hidaka Town, Uenzaru-gawa , 10 VII–1 VIII 2007, A. Ueda leg. ( MT) ( KPMNH) . [ Honshu ] 1F , Yamagata Pref., Mamurogawa Town , 3. X. 2009, Y. Matsubara & K. Fukuda leg. ( KPMNH) ; 1F, Fukushima Pref., Kitakata City, Yamato , 11. VII. 2014, ( KPMNH) ; 1M, Gunma Pref., Tsumagoi Vil., Kanbara, Takamine-kogen , 3. IX. 2015, K. Watanabe leg. ( KPMNH) ; 1F, Toyama Pref., Toyama City, Arimine, Inonedani , 15–22 IX 2009, M. Watanabe leg. ( MT) ( KPMNH) ; 1M, Toyama Pref., Toyama City, Arimine, Jurodani , 15–22 IX 2009, M. Watanabe leg. ( MT) ( KPMNH) ; 1M, Toyama Pref., Toyama City, Kamegai , 1–8 IX 2009, M. Watanabe leg. ( MT) ( KPMNH) ; 1F, ditto, 15–26 IX 2009, M. Watanabe leg. ( MT) ( KPMNH) ; 1F, Nagano Pref., Otaki Vil., Mt. Ontakesan, Tanohara , 17. VII. 2007, K. Watanabe leg. ( KPMNH) ; 1M (holotype), Gifu Pref., Mt. Norikura , 29. VII. 1954, Townes family leg. ( AEI) ; 1F, (paratype), Nagano Pref., Kamikochi , 22. VII. 1954, Townes family leg. ( SEHU) .

Diagnosis. Antenna with 20–21 (in female) or 23 (in male) flagellomeres. Tyloids on FL VII to FL XII or FL XIII in male. Face coriaceous and matt; densely punctate. Clypeus depressed apically; robes rounded at outer corners. Mesoscutum coriaceous and matt in female; coriaceous and polished in male; densely punctate in both sexes. Mesopleuron coriaceous and matt; at most with very sparse punctures anteriorly and ventrally in female ( Fig. 6 C ); smooth and polished; with coriaceous area below episternal scrobe; at most with very sparse punctures anteriorly and ventrally in male. Propodeum coriaceous; posterior part of lateromedian longitudinal carina and pleural carina present. Fore wing length 4.5–5.5 mm. Areolet present. Dorsal part of hind coxa coriaceous and matt. Metasoma dorsoventrally depressed in both sexes. Latero-median carina usually indistinct; at most present on basal 0.4 of T I. T I 1.4–1.5 × as long as maximum width; strigose laterally; otherwise coriaceous. T II 0.85–0.9 × as long as maximum width. Face without pair of yellow markings along each inner orbits ( Figs 6 B, F ). Face entirely black or black with a brown median marking which separated from clypeus in female ( Fig. 6 B ); entirely yellow in male ( Fig. 6 F ). Clypeus yellow with black base in both sexes ( Figs 6 B, F ). Malar space entirely black in female ( Fig. 6 B ), entirely yellow in male ( Fig. 6 F ). Yellow shoulder markings of mesoscutum absent in female ( Fig. 6 A ); present in male ( Fig. 6 E ). Scutellum entirely black. All coxae entirely black in female ( Fig. 6 A ). Fore and mid coxae entirely yellow; hind coxa entirely black in male ( Fig. 6 E ). Hind tibia whitish-yellow to white; darkened basally and apically; often with a black dorsal stripe and a black subbasal marking. T III with a brown apical marking and T II and T IV often with brown marking in female ( Fig. 6 D ). T III with pair of yellow to brown basal marking in male ( Fig. 6 G ). T III and T VI often each with a yellow to brown basal or apical band in male ( Fig. 6 G ).

Distribution. Japan (Hokkaido and Honshu).

Bionomics. Unknown.

Remarks. This is the first record of this species from Hokkaido.

Figures

FIGURE 6. Homotropus infuscatus (Uchida, 1957), female (A–D) and male (E–G)―A, E: lateral habitus; B, F: head, frontal view; C: mesopleuron, lateral view; D, G: T II to apex of metasoma, dorsal view.