Aptesis ezoensis, Watanabe, 2025

Aptesis ezoensis sp. nov.

[New SJN: Ezo-akahara-togari-himebachi]

( Figs. 9A–G, 77H, 78G)

Type series. Holotype: JAPAN, KPM-NK 81202 , F, Hokkaido, Horokanai Town, Uryu, Research Forest of Hokkaido University , 11–17. VII. 2012, K. Watanabe et al. leg. (MsT) . Paratype: JAPAN, KPM-NK 81203 , F, same locality of holotype, 17. VII. 2012, M. Ito leg. ; KPM-NK 84973 , F, same data of holotype .

Description. Female (n = 3). Body punctate and polished; covered with setae; body length 5.4–6.2 (HT: 6.2) mm.

Head 0.65 × as long as wide in dorsal view. Clypeus 2.4–2.5 (HT: 2.5) × as wide as long; slightly convex in lateral view; sparsely punctate and coriaceous dorsally, smooth ventrally; lower margin slightly rounded in frontal view, sharp in lateral view. Face 0.3–0.35 (HT: 0.3) × as long as minimum width; weakly convex medially; punctate; ISP matt. Frons densely punctate with coriaceous ISP; with pair of weak, smooth concavities above antennal sockets. POL 1.5–1.6 (HT: 1.6) × as OD. OOL 1.1–1.4 (HT: 1.1) × as OD. Dorsal profile of gena slightly rounded in dorsal view; width gradually narrowing posteriorly ( Fig. 9D). Occipital carina complete. Malar space 1.2 × as long as basal width of mandible. Mandible flat at base; lower tooth equal in length of upper tooth. Antenna with 22 flagellomeres; weakly flattened and tapped apically. FL I 2.0 × as long as maximum depth in lateral view, 1.0 × as long as FL II.

Mesosoma. Pronotum rugulose ventrally ( Fig. 9E). Epomia short; section on border of collar and pronotum present. Mesoscutum with short and weak notaulus; densely punctate. Scutellum slightly convex in lateral view. Mesopleuron without conspicuous smooth area around speculum; punctures partly united into foveola ( Fig. 9E). Epicnemial carina present laterally and ventrally. Sternaulus deep in anterior 0.5 of mesopleuron. Metapleuron rugose posteriorly; with partly indistinct juxtacoxal carina. Propodeum rugose or rugulose; with all carinae except for anterior transverse carina absent; anterior section of lateromedian longitudinal carinae nearly parallel each other; area superomedia defined except for anterior margin, longer than wide; apophysis absent ( Fig. 9G); spiracle oval or round ( Fig. 77H). Fore wing length 4.75–5.3 (HT: 5.3) mm. Areolet as long as maximum width; width gradually narrowing anteriorly; received vein 2m-cu at slightly at near middle ( Fig. 9F). Fore wing vein 1cu-a interstitial to vein M&RS ( Fig. 9F). Nervellus slightly inclivous; intercepted posterior to middle. Hind femur reticulate coriaceous; 4.4–4.9 (HT: 4.4) × as long as maximum depth in lateral view. Tarsal claws simple.

Metasoma finely and sparsely punctate except for T I; ISP smooth or slightly coriaceous. T I 2.0 × as long as maximum width; latero-median carina present except for apical part; dorso-lateral carina complete ( Fig. 77H); largely coriaceous basally and medially, smooth apically. T II 0.75–0.85 (HT: 0.85) × as long as maximum width. Thyridium present; close to anterior margin of T II; slightly depressed; ca. 1.5 × as wide as length. Ovipositor sheath 0.83 × as long as hind tibia, 1.3–1.35 (HT: 1.3) × as long as T I. Ovipositor straight; apex sharp; apex of lower valve with teeth ( Fig. 78G).

Colouration ( Figs. 9A–G). Body (excluding wings) black to blackish-brown. Setae silver. Mandible except for teeth, scape, pedicel, and legs reddish-yellow. Basal segments of flagellum tinged with brown to ivory. Clypeus and palpi partly tinged with brown. Tibial spurs ivory. Membranous part of metasomal sternites yellow to yellowish-brown. FL V to FL X with white markings. Apical part of T I, T II, and T III reddish-yellow. Posterior margins of T VI to T VIII narrowly white medially. Ovipositor reddish-brown. Wings hyaline. Veins and pterostigma brown except for yellowish-brown to yellow wing base.

Male. Unknown.

Distribution. Japan (Hokkaido).

Bionomics. Unknown.

Etymology. The specific name is from the old locality name of Hokkaido, Ezo.

Remarks. This species resembles Ap. improba ( Gravenhorst, 1829) in the largely red legs and metasomal tergites and the propodeum without apophysis but can be distinguished by the black base of T I, T IV, and T V (red in Ap. improba ), the entirely reddish-yellow hind femur (with black apical part in Ap. improba ), and the ovipositor shorter than hind tibia (approximately as long as hind tibia in Ap. improba ).