Aptesis albicoxalis, Watanabe, 2025

Aptesis albicoxalis sp. nov.

[New SJN: Atsugi-togari-himebachi]

( Figs. 8A–G, 78F)

Aptesis sp. A : Watanabe & Taniwaki, 2018: 75.

Type series. Holotype: JAPAN, KPM-NK 81204 , F, Honshu, Kanagawa Pref., Atsugi City, Nakaogino , 9. V. 2007, K. Watanabe leg. Paratype: JAPAN: [Honshu] KPM-NK 81205 , F, same data of holotype ; KPM-NK 81206 , F, Nagano Pref., Outaki Vil., Mt. Ontake-san, Hakkaisan , 4. VIII. 2017, K. Watanabe leg.

Description. Female (n =3). Body punctate and polished; covered with setae; body length 5.75–6.2 (HT: 5.75) mm.

Head 0.6 × as long as wide in dorsal view. Clypeus 2.0–2.15 (HT: 2.0) × as wide as long; slightly convex in lateral view; sparsely punctate dorsally; smooth ventrally; lower margin weakly rounded in frontal view, sharp in lateral view. Face 0.4 × as long as minimum width; weakly convex medially, densely punctate; ISP smooth. Frons densely punctate, with pair of weak, smooth concavities above antennal sockets. POL 1.6–2.0 (HT: 1.8) × as OD. OOL 1.4 × as OD. Dorsal profile of gena rounded in dorsal view; width gradually narrowing posteriorly ( Fig. 8D). Occipital carina complete. Malar space 1.05–1.1 (HT: 1.05) × as long as basal width of mandible. Mandible flat at base; lower tooth equal in length of upper tooth. Antenna with 22–23 (HT: 23) flagellomeres; not flattened and tapped. FL I 2.4–2.6 (HT: 2.4) × as long as maximum depth in lateral view, 0.95–1.05 (HT: 0.95) × as long as FL II.

Mesosoma. Pronotum rugulose ventrally ( Fig. 8E). Epomia absent. Mesoscutum with short and weak notaulus; densely punctate medially. Scutellum slightly convex in lateral view. Mesopleuron without conspicuous smooth area around speculum; punctures partly united into foveola ( Fig. 8E). Epicnemial carina present laterally and ventrally. Sternaulus deep in anterior 0.6 of mesopleuron. Metapleuron rugose ventrally, with complete juxtacoxal carina. Propodeum largely rugose; with all carinae; dorsal face shorter than area postero; area superomedia defined, ca. 1.0 × as long as maximum width; apophysis weak and obtuse ( Fig. 8G); spiracle round. Fore wing length 4.4–5.2 (HT: 4.6) mm. Areolet as long as maximum width; width gradually narrowing anteriorly; received vein 2m-cu basal than middle ( Fig. 8F). Fore wing vein 1cu-a slightly postfurcal to vein M&RS ( Fig. 8F). Nervellus inclivous; intercepted near posterior end of vein ( Fig. 8F). Hind femur reticulate coriaceous; 4.2–4.5 (HT: 4.4) × as long as maximum depth in lateral view. Tarsal claws simple.

Metasoma finely and sparsely punctate; ISP smooth. T I 1.95–2.1 (HT: 1.95) × as long as maximum width; latero-median carina present except for apical part; dorso-lateral carina complete. T II 0.5–0.55 (HT: 0.5) × 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 1.2–1.38 (HT: 1.38) × as long as hind tibia, 1.9–2.15 (HT: 2.15) × as long as T I. Ovipositor straight or slightly decurved; apex sharp; apex of lower valve with teeth ( Fig. 78F).

Colouration ( Figs. 8A–G). Body (excluding wings) black to blackish-brown. Setae silver. Mandible except for teeth, clypeus, basal and ventral parts of antenna, palpi, and tegula more or less tinged with reddish-yellow. FL V to FL X with white markings. Fore and mid legs and membranous part of metasomal sternites yellow to yellowish-brown. Hind coxa and basal part of hind femur reddish-yellow. Hind trochanter, trochantellus, and tibial spurs yellow to yellowish-brown. Median parts of T VI and T VII white. Ovipositor reddish-brown. Wings yellowish-hyaline. Veins and pterostigma yellowish-brown except for yellow wing base.

Male. Unknown.

Distribution. Japan (Honshu).

Bionomics. Unknown.

Etymology. The specific name is from Latin “ albi ” (white) plus “ coxalis ” (coxa), which means whitish coxa.

Remarks. This species resembles Ap. corniculata Sheng, 2003 in the colouration but can be distinguished by the face 0.4 × as long as minimum width (0.5 × in Ap. corniculata ) and the T I 1.95–2.1 × as long as maximum width (1.2 × in Ap. corniculata ).