Taxonomic Study of Japanese Ctenopelmatinae (Hymenoptera, Ichneumonidae), with Descriptions of 22 New Species Author Watanabe, Kyohei text Bulletin of the Kanagawa Prefectural Museum (Natural Science) 2024 2024-03-22 53 39 102 journal article 10.5281/zenodo.13237363 2189-6720 13237363 D4FC7074-ADC6-4310-B60E-12B7ECBD6E25 Perilissus autumnalis sp. nov. (SJN: Akino-maru-himebachi) ( Figs. 33A–D , 39K , 40X , 41B, D ) Type series . Holotype : JAPAN , KPM-NK 91241 , F, Aichi Pref. , Toyohashi City , Suse-cho , Kanbata , 23. X. 2018 , S. Morishita leg. Paratypes : JAPAN , TMNH , F, Aichi Pref. , Toyohashi City , Ishimaki-cho , Ege , 14. X. 2018 , S. Morishita leg. ; KPMNK 91242 , F, Toyama Pref. , Toyama City , Arimine , Jurodani , 25. VIII. – 1. IX. 2009 , M. Watanabe et al. leg. (MsT); KPM-NK 91243 , F, Toyama Pref. , Toyama City , Nanto City , Togamura to Kamimomose , 25. VIII. – 1. IX. 2009 , M. Watanabe et al. leg. (MsT); KPM-NK 91244 , F, ditto, 15–29. IX. 2009 ; KPM-NK 91245 , F, Toyama Pref. , Toyama City , Higashikuromaki , Ueno , 20. VI. 2008 , T. Yamauchi leg. ; KPM-NK 91246 , M, Kanagawa Pref. , Fujisawa City , Campus of Keio University , 13. VI. 2019 , T. Amano leg. ; KPM-NK 91247 , M, Kanagawa Pref. , Odawara City , Hayakawa , Mt. Ishigaki-yama , 21. IX. 2014 , K. Watanabe leg. Description. Female ( n = 6). Body length 7.0–7.3 (HT: 7.2) mm, matt and covered with silver setae. Head 0.65 × as long as wide in dorsal view. Clypeus 2.3–2.7 (HT: 2.7) × as broad as high, sparsely punctate, convex in lateral view, lower margin subtruncate ( Fig. 40X ). Face 1.8–1.9 (HT: 1.8) × as broad as high, slightly convex medially in lateral view. Dorsal profile of gena as Fig. 39K . Occipital carina complete. Length of malar space 0.5–0.7 (HT: 0.7) × as long as basal width of mandible. Base of mandible flat ( Fig. 41B ). Lower tooth of mandible longer than upper tooth ( Fig. 41B ). Ocelli large ( Fig. 39K ). POL 0.7–1.0 (HT: 1.6) × as long as OD. OOL 1.2–1.4 (HT: 1.4) × as long as OD. Antenna with 32–34 (HT: 34) flagellomeres. FL I 3.35 × as long as maximum depth, 1.1 × as long as FL II. Mesosoma. Epomia short. Mesoscutum without notaulus. Epicnemial carina present laterally and ventrally, its dorsal end situated slightly behind of anterior margin of mesopleuron. Speculum with small smooth area ( Fig. 33C ). Propodeum with complete carinae. Lateromedian longitudinal carina sometimes partly indistinct ( Fig. 41D ). Area superomedia longer than wide, received lateral section of anterior transverse carina anterior to middle ( Fig. 41D ). Fore wing length 6.0–6.6 (HT: 6.3) mm. Areolet present, shortly petiolated, received vein 2m-cu slightly apically to the middle ( Fig. 33D ). Fore wing vein 1cu-a interstitial to vein M&RS.Nervellus subvertical, intercepted at or slightly anterior the middle. Tarsal claws pectinate. Hind femur 4.7–4.8 (HT: 4.8) × as long as maximum depth in lateral view. Ratio of length of hind first to fifth tarsomeres 4.1–4.2 (HT: 4.1): 2.0: 1.5: 0.9–1.0 (HT: 0.9): 0.9–1.0 (HT: 0.9). Fig. 33. Perilissus autumnalis sp. nov . (KPM-NK 91241, holotype, female) ― A: lateral habitus; B: head, frontal view; C: mesopleuron and metapleuron; D: areolet. Metasoma. T I 1.6–1.8 (HT: 1.6) × as long as maximum width. T II 0.7–0.85 (HT: 0.7) × as long as maximum width. Ovipositor sheath 0.25 × as long as hind tibia. Colouration ( Figs. 33A–D ). Body (excluding wings and legs) blackish brown to black. Face, malar space, clypeus, and pedicel tinged with yellowish brown to brown. Palpi, mandible except for teeth, tegula, and membranous part of metasomal sternites yellowish brown to brown. Wings hyaline. Veins and pterostigma blackish brown except for yellowish-brown wing base. Fore and mid legs yellowish brown. Hind leg blackish brown to black except for trochanter, trochantellus, basal part of tibia, and base of each tarsal segment more or less tinged with yellowish brown. Male ( n = 2). Similar to female. Body length usually slightly shorter than female (minimum specimen: 6.0 mm). Clypeus 2.1 × as broad as high. OOL 1.5 × as long as OD. Antenna with 31 flagellomeres. FL I 2.5–2.9 × as long as maximum depth. T I 1.9 × as long as maximum width. Hind coxa yellowish brown. Distribution. Japan (Honshu). Bionomics. Unknown. Etymology . The specific name is from Latin “ autumnalis ” (autumn). Some adults of this species collected in Autumn, which is rather rare case in Japanese ctenopelmatines. Remarks. This species resembles Peril. sericeus ( Gravenhorst, 1829 ) in the body colouration but can be distinguished by the yellowish brown to brown face (black in Peril. sericeus ), the yellowish brown to brown tegula (whitish yellow in Peril. sericeus ), and the blackish brown to black hind coxa and femur (sometimes yellowish brown in P eril. sericeus ).