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 Mesoleptidea mesorufa sp. nov. (SJN: Muneaka-hoso-maru-himebachi) ( Figs. 14A–E , 38H , 40I ) Type series . Holotype : JAPAN , KPM-NK 84859 , F, Hokkaido , Obihiro City , 15. VIII. 2019 , T. Amano leg. Description. Female ( n = 1). Body length 8.8 mm , matt and covered with silver setae. Head 0.65 × as long as wide in dorsal view. Clypeus 2.7 × as broad as high, sparsely punctate ventrally, lower margin rounded ( Fig. 40I ). Face 1.7 × as broad as high, finely punctate and flat. Dorsal profile of gena as Fig. 38H . Occipital carina complete. Length of malar space 0.7 × as long as basal width of mandible. POL 0.9 × as long as OD. OOL 1.2 × as long as OD. Antenna with 38 flagellomeres. FL I 6.65 × as long as maximum depth, 2.0 × as long as FL II. Mesosoma. Epomia absent. Mesoscutum with weak notaulus. Epicnemial carina present laterally and ventrally, its dorsal end situated near anterior margin of mesopleuron. Speculum with large smooth area. Mesopleuron with oblique or transverse rugae in front of speculum. Interspace of punctures of mesopleuron and propodeum granulate or dull ( Fig. 14D ). Metapleuron with distinct punctures ( Fig. 14C ). Propodeum coriaceous, without longitudinal smooth area dorsally ( Fig. 14D ), without carinae except for lateral longitudinal carina and pleural carina. Fore wing length 7.6 mm . Areolet present, shortly petiolated anteriorly, received vein 2m-cu near the outer angle ( Fig. 14E ). Fore wing vein 1cu-a interstitial to vein M&RS. Nervellus subvertical, intercepted posterior the middle. Tarsal claws simple. Hind femur 6.0 × as long as maximum depth in lateral view. Ratio of length of hind first to fifth tarsomeres 3.8: 2.0: 1.5: 0.9: 0.9. Fig. 14. Mesoleptidea mesorufa sp. nov . (KPM-NK 84859, holotype, female) ― A: lateral habitus; B: head, frontal view; C: metapleuron; D: propodeum, dorso-lateral view; E: areolet. Metasoma finely punctate. T I 2.9 × as long as maximum width. T II 1.2 × as long as maximum width. Ovipositor sheath 0.2 × as long as hind tibia. Colouration ( Figs. 14A–E ). Body (excluding wings and legs) black. Two pairs of markings of frontal orbit, face except for a median longitudinal black stripe, clypeus, malar space, mandible except for teeth, lower part of gena, palpi, ventral surface of antenna, ventral part of propleuron, small spots of collar, postero-dorsal corner of pronotum, a pair of longitudinal markings of antero-lateral part of mesoscutum, scutellum, postscutellum, tegula, subtegular ridge, and longitudinal stripe of mesopleuron yellow to yellowish brown. Mesoscutum except for yellow markings, mesopleuron along yellow stripe, mesosternum, and a small area of metapleuron reddish brown. Posterior margins of T IV to T VII, lateral margins of T II to T VII, and membranous part of metasomal sternites whitish yellow to white. Ovipositor yellowish brown. Wings hyaline. Veins and pterostigma brown to yellowish brown except for yellow wing base. Fore and mid legs whitish yellow to yellowish brown (coxae, trochanters, and trochantelli paler than other parts). Hind coxa and femur reddish brown each with dorsal blackish brown stripe. Hind trochanter and hind tibia except for base blackish brown. Hind tibia whitish yellow at base. Hind trochantellus and tibial spurs whitish yellow. Hind tarsus blackish brown, each segment with a narrow whitish yellow base. Male. Unknown. Distribution. Japan ( Hokkaido ). Bionomics. Unknown. Etymology . The specific name is from Latin “ meso -” (middle) plus “ rufa ” (red), which derived from the red mesoscutum. Remarks. This species resembles Mesolep. maculata in the presence of the areolet and in the body colouration, but can be distinguished by the entirely rounded clypeus (with a median concavity in Mesolep. maculata ), the yellow scutellum (black in Mesolep. maculata ), and the metapleuron with distinct punctures (punctures indistinct in Mesolep. maculata ).