Lamachus montanus, Watanabe, 2024

Watanabe, Kyohei, 2024, Taxonomic Study of Japanese Ctenopelmatinae (Hymenoptera, Ichneumonidae), with Descriptions of 22 New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 53, pp. 39-102 : 78

Key to Japanese species of Lamachus

1. Notaulus extending behind of the middle of mesoscutum. T III and T IV red.

.............................. Lamachus iwatai Momoi, 1962 -. Notaulus not extending the middle of mesoscutum. Metasomal tergites black, its posterior margin sometimes tinged with white ( Figs. 26A , 27A ).

...................................................................... 2 2. Propodeum with lateromedian longitudinal carina (more or less indistinct partly). Latero-median carina of T I distinct. T I 1.5 × as long as maximum width. Upper tooth of mandible as long as lower tooth.

........................... Lamachus gilpiniae Uchida, 1955 -. Propodeum without lateromedian longitudinal carina ( Figs. 26C , 27D ). Latero-median carina of T I indistinct or absent. T I more than 1.6 × as long as maximum width. Upper tooth of mandible slightly longer than lower tooth. ...................................................................... 3

3. Hind coxa black with white area(s) (at least ventrally) ( Fig. 26A ). Hind femur and tibia black except for white band ( Fig. 26A ). Length of T I 1.7–2.0 × as long as maximum width.

...................... Lamachus albopictus Cushman, 1937 -. Hind coxa, femur, and tibia reddish brown except for narrow black base ( Fig. 27A ). T I 2.1–2.3 × as long as maximum width.

................................. Lamachus montanus sp. nov.

Figures

Fig. 26. Lamachus albopictus Cushman, 1937 (A–E:KPM-NK 84940, female; F: KPM-NK 84942, male) ― A: lateral habitus; B, F: head, frontal view; C: propodeum,dorsal view; D: apical part of metasoma, lateral view; E: areolet.

Fig. 27.Lamachus montanus sp. nov. (KPM-NK 84944, holotype, female) ―A: lateral habitus; B: head, frontal view; C: mesopleuron; D: propodeum, dorso-lateral view; E: areolet.