Schenkia alpina, Watanabe, 2025

Schenkia alpina sp. nov.

[New SJN: Ontake-futo-togari-himebachi]

( Figs. 57A–G, 79W)

Type series. Holotype: JAPAN, KPM-NK 84968 , F, Honshu, Nagano Pref., Outaki Vil., Mt. Ontake-san, Hakkaisan , 5. VIII. 2017, K. Watanabe leg. Paratype: JAPAN, KPM-NK 84974 , F, same locality of holotype, 18–20. VIII. 2014, S. Shimizu leg. (MsT) .

Description. Female (n = 2). Body polished; covered with setae; body length 8.4–9.5 (HT: 9.5) mm.

Head 0.6 × as long as wide in dorsal view. Clypeus 2.7 × as wide as long; slightly convex in lateral view; punctate and coriaceous dorsally, smooth ventrally; lower margin subtruncate in frontal view, obtuse in lateral view. Face 0.45 × as long as minimum width; weakly convex medially; matt; finely punctate. Frons weakly concave above antennal sockets; matt and punctate dorsally, coriaceous and partly transversely rugulose ventrally. POL 1.2–1.3 (HT: 1.2) × as OD. OOL 1.0–1.2 (HT: 1.0) × as OD. Gena and occiput finely and densely punctate. Dorsal profile of gena rounded in dorsal view; width gradually narrowing posteriorly ( Fig. 57D). Occipital carina complete. Malar space 0.9–1.0 (HT: 0.9) × as long as basal width of mandible. Mandible flat at base; lower tooth equal in length of upper tooth. Antenna with 29–30 (HT: 29) flagellomeres; apical part flattened below and tapped to slender apex. FL I 1.8–1.9 (HT: 1.9) × as long as maximum depth in lateral view, 0.9 × as long as FL II.

Mesosoma. Pronotum rugulose ventrally and posteriorly, densely punctate antero-dorsally ( Fig. 57E). Epomia absent. Mesoscutum densely punctate; with short and weak notaulus ( Fig. 57D). Scutellum sparsely punctate ( Fig. 57G); slightly convex in lateral view. Mesopleuron punctate; punctures partly united into groove-like foveola; with conspicuous smooth area around speculum ( Fig. 57E). Epicnemial carina present laterally and ventrally. Sternaulus deep in anterior 0.5 of mesopleuron. Metapleuron punctate anteriorly, irregularly rugulose posteriorly; with complete juxtacoxal carina. Propodeum rugose or rugulose except for area externa finely and sparsely punctate with smooth ISP ( Fig. 57G); anterior transverse carina absent; posterior transverse carina complete, inverted U-shaped; lateromedian longitudinal carina complete; lateral longitudinal carina complete; pleural carina complete; area superomedia distinct except for anterior margin, slightly longer than wide; apophysis absent; spiracle oval. Fore wing length 7.65–8.5 (HT: 8.5) mm. Areolet as long as maximum width; width gradually narrowing anteriorly; received vein 2m-cu at near middle ( Fig. 57F). Fore wing vein 1cu-a slightly antefurcal to vein M&RS. Nervellus slightly inclivous; intercepted near posterior end of vein. Hind femur reticulate coriaceous; 4.2–4.6 (HT: 4.6) × as long as maximum depth in lateral view. Tarsal claws simple.

Metasoma finely and sparsely punctate; ISP smooth. T I 2.1 × as long as maximum width; latero-median carina absent posteriorly; dorso-lateral carina complete. T II 0.65–0.75 (HT: 0.65) × as long as maximum width. Thyridium present; close to anterior margin of T II; slightly depressed; ca. 3.0 × as wide as length. Ovipositor sheath 1.2 × as long as hind tibia, 1.8–1.85 (HT: 1.85) × as long as T I. Ovipositor slightly decurved; apex obtuse; apex of lower valve with teeth ( Fig. 79W).

Colouration ( Figs. 57A–G). Body (excluding wings) black to blackish-brown. Setae silver; more or less brownish on head and mesoscutum. Subapical part of mandible, lower part of clypeus, ventral surface of apical part of flagellum, and posterior margin of T II tinged with reddish-brown. Face and frons with pair of longitudinal yellow stripe along each orbit; stripe narrowly absent on frons in HT or largely absent in paratype. FL VI to FL XI (or XII in HT) with white markings. Median part of collar, second to fourth tarsomeres of mid and hind legs, and apex of metasoma ivory. Scutellum and apex of T I narrowly tinged with ivory. Fore tarsus and apex of hind first tarsomere sometimes partly tinged with ivory. Thyridium and ovipositor reddish-brown. Membranous part of metasomal sternites yellowish-brown. Wings hyaline. Veins and pterostigma blackish-brown to brown except for yellowish-brown wing base.

Male. Unknown.

Distribution. Japan (Honshu).

Etymology. The specific name is from Latin “ alpina ”, which means alpine mountains.

Remarks. This species resembles S. tosaensis in the black body and the shape of ovipositor apex but can be distinguished by the hind tarsus with white areas (black in S. tosaensis ), the facial and frontal orbits with yellow markings (without markings in S. tosaensis ) and the FL I 1.8–1.9 × as long as maximum depth in lateral view (2.6 × in S. tosaensis )