Nematopodius (Nematopodius) montanus sp. nov. (Standard Japanese name: Miyama-hoso-togari-himebachi) (Figs. 1F, 3H, 10B–H) Holotype. KPM-NK 69554, F, JAPAN, Gunma Pref., Katashina Vil., Mt. Hotakasan, 2. VIII. 2007, K. Watanabe leg. Paratypes. JAPAN: KPM-NK 69581, F, Hokkaido, Sapporo City, Mt. Maruyama, 28. VII. 2009, K. Watanabe leg.; KPM-NK 69582, F, Kanagawa Pref., Yamakita Town, Mt. Komotsurushiyama, 20. VIII. 2014, T. Taniwaki leg.; KPM-NK 69583, F, Yamanashi Pref., Hokuto City, Masutomi, Biwakubo-sawa, 28. VII. – 7. VIII. 2007, K. Watanabe leg. (MsT); KPM-NK 69584, F, Yamanashi Pref., Katsunuma Town, Ootakifudo, 4. VIII. 2008, K. Watanabe leg.; KPM-NK 69585, F, Tochigi Pref., Nasushiobara City, Ookawa-rindo, 28. VII. – 11. VIII. 2010, T. Nakayama leg. (MsT); KPM-NK 69928, F, ditto, 25. VIII. – 13. IX. 2010; KPM-NK 69929, M, Nagano Pref., Outaki Vil., Mt. Ontakesan, 8–9. VIII. 2014, S. Shimizu leg. (MsT). Description. Female (n=7). Body length 7.5–9.5 (HT: 9.0) mm, polished, covered with silver setae. Head 0.65–0.7 (HT: 0.65) times as long as wide. Clypeus 0.45–0.5 (HT: 0.5) times as long as wide, weakly convex, its lower margin subtruncate and margined. Face 0.65–0.7 (HT: 0.65) times as long as wide, almost flat, with a pair of longitudinal shallow depression below antennal socket. Frons slightly concave ventrally, largely smooth except for sparsely punctate dorsally. Occipital carina largely absent laterally, its lower end joined with base of mandible (Fig. 1F). MSL 0.4–0.5 (HT: 0.45) times as long as BWM. OOL 0.6–0.7 (HT: 0.6) times as long as OD. POL 1.3–1.4 (HT: 1.3) times as long as OD. Antenna with 28–29 (HT: 28) flagellomeres. F1 1.2–1.25 (HT: 1.2) times as long as F2. Mesosoma punctate. Epomia present. Lateral area of pronotum striated ventrally (Fig. 10C), with a smooth area dorsally. Notauli distinct and deep, each posterior end confluent each other. Scutellum weakly convex. Epicnemial carina distinct, its dorsal end close to subalar prominence. Mesopleuron with striae along epicnemial carina, subalar prominence and speculum. Speculum smooth. Propodeum without carinae except for complete anterior transverse carina and anterior section of pleural carina. Propodeal apophysis absent (Fig. 10E). Propodeal spiracle oval. Fore wing length 5.0–7.0 (HT: 6.5) mm. Areolet present, small, hexagonal, with sides nearly parallel, outer side indistinct (Fig. 10F). Nervulus opposite to or slightly based on basal vein. Nervellus intercepted anterior to midpoint. Hind femur 6.3–6.7 (HT: 6.3) times as long as maximum depth in lateral view. Hind TS2: TS1, TS3, TS4 and TS5 = 2.0: 3.8, 1.2, 0.6 and 0.6–0.7 (HT: 0.6). Metasoma. T1 3.75–3.9 (HT: 3.75) times as long as maximum width, finely and sparsely punctate posteriorly, smooth anteriorly, with a pair of small triangular teeth at base. Median dorsal carina and dorsolateral carina of T1 absent. T2 2.25–2.4 (HT: 2.3) times as long as maximum width. Ovipositor sheath 0.4 times as long as hind tibia. Apex of ovipositor as Fig. 3H. Coloration (Figs. 10B–F). Body (excluding wings and legs) black, except for: face, clypeus, mandible except for apex, all orbits except for dorsal end of temporal orbit, malar space, collar, lower par and dorsal margin of pronotum, posterior area of propleuron, median spot of mesoscutum, scutellum, postscutellum, tegula and subalar prominence yellow; speculum, lower part of mesopleuron, mesosternum, dorsal margin of metapleuron, and posterior margin of T1–T7 tinged with yellow to reddish brown; posterior part of propodeum partly tinged with reddish brown; ovipositor reddish brown. Wings hyaline; veins and pterostigma brown except for yellow wing base. Fore and mid legs yellow to yellowish brown. Hind leg blackish brown, partly tinged with brown to yellowish in coxa, trochanter, trochantellus, femur and tibia. Male (n=1). Similar to female. OOL 0.5 times as long as OD. Antenna with 30 flagellomeres. F18–F20 with a tyloid. Hind femur 7.1 times as long as maximum depth in lateral view. Hind TS2: TS1, TS3, TS4 and TS5 = 2.0: 3.6, 1.3, 0.6 and 0.5. T1 4.85 times as long as maximum width. T2 2.0 times as long as maximum width. Coloration similar to female (Fig. 10H) except mesopleuron and metapleuron largely yellow to reddish yellow. Distribution. Japan (Hokkaido and Honshu). Etymology. The specific name is from the Latin “montanus ” (mountain), referring to their habitat. Remarks. This species resembles N. formosus Gravenhorst, 1829, in the pronotum with a dorsolateral white margin and the antenna without a white band (in N. formosus usually with a small white band), but it can be distinguished by the nervellus intercepted anterior to midpoint (intercepted posterior to midpoint in N. formosus) and the antenna already without a white band (Fig. 10B) (usually with a small white band in N. formosus). This species can easily separable from other Japanese species by the absence of a white band of antenna (with a wide white band in N. flavoguttatus and N. oblongs) and the pronotum with a dorsolateral white margin (Figs. 10 B, C, H) (without a white margin in N. debilis and N. kusigematii).

Published as part of Kyohei Watanabe, 2019, Taxonomic and Zoogeographical Notes of Japanese Cryptinae (Hymenoptera, Ichneumonidae), with Description of Five New Species, pp. 81-113 in Bulletin of the Kanagawa Prefectural Museum (Natural Science) 48 on pages 101-102, DOI: 10.5281/zenodo.11205625