Aptesis yamauchii, Watanabe, 2025

Aptesis yamauchii sp. nov.

[New SJN: Yamauchi-togari-himebachi]

( Figs. 15A–G, 78L)

Type series. Holotype: JAPAN, KPM-NK 81208 , F, Honshu, Toyama Pref., Toyama City, Arimine , Inonedani , 1–8. IX. 2009, M. Watanabe leg. (MsT) . Paratype: JAPAN [Honshu] KPM-NK 102997 , F, Honshu, Toyama Pref., Toyama City, Arimine, Inonedani , 4–11. VIII. 2009, M. Watanabe leg. (MsT); KPM-NK 81210 , F, Toyama Pref., Toyama City, Arimine, Jyurodani , 4–11. VIII. 2009, M. Watanabe leg. (MsT); OMNH , F, 11–16. VIII. 2009; KPM-NK 102827 , F, Toyama Pref., Nanto City, Togamura-kamimomose , 21–28. VII. 2009, KPM-NK 81209 , F, ditto, 11–18. VIII. 2009, M. Watanabe leg. (MsT); KPM-NK 102999 , F, Nagano Pref., Outaki Vil., Mt. Ontake-san, Hakkaisan , 31. VII. 2013, K. Watanabe leg.; KPM-NK

102998, F, ditto, 5. VIII. 2017.

Description. Female (n = 7). Body punctate and polished; covered with setae; body length 5.8–7.4 (HT: 7.4) mm.

Head 0.6 × as long as wide in dorsal view. Clypeus 1.9–2.0 (HT: 2.0) × as wide as long; weakly convex in lateral view; sparsely punctate dorsally; smooth ventrally; lower margin subtruncate in frontal view, sharp and narrowly reflected in lateral view. Face 0.4–0.45 (HT: 0.45) × as long as minimum width; weakly convex medially; punctate; ISP coriaceous laterally, smooth medially. Frons densely punctate with coriaceous ISP; area above antennal sockets narrowly smooth. POL 1.6–2.2 (HT: 1.6) × as OD. OOL 1.0–1.4 (HT: 1.1) × as OD. Dorsal profile of gena slightly rounded in dorsal view; width gradually narrowing posteriorly ( Fig. 15D). Occipital carina complete. Malar space 1.25–1.45 (HT: 1.3) × as long as basal width of mandible. Mandible flat at base; lower tooth equal in length of upper tooth. Antenna with 26–27 (HT: 26) flagellomeres; not flattened and tapped. FL I 2.1–2.4 (HT: 2.4) × as long as maximum depth in lateral view, 0.95–0.98 (HT: 0.95) × as long as FL II.

Mesosoma finely punctate. Pronotum rugulose ventrally. 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 with conspicuous smooth area around speculum. Epicnemial carina present laterally and ventrally. Sternaulus deep in anterior 0.7 of mesopleuron. Metapleuron with partly indistinct or complete juxtacoxal carina. Propodeum rugose or rugulose; with all carinae except for anterior transverse carina absent; anterior section of lateromedian longitudinal carina sometimes (including holotype) absent anteriorly; area superomedia partly defined; apophysis absent ( Fig. 15G); spiracle round. Fore wing length 5.0–6.2 (HT: 6.2) mm. Areolet as long as maximum width; width gradually narrowing anteriorly; received vein 2m-cu at near middle ( Fig. 15F). Fore wing vein 1cu-a interstitial to vein M&RS ( Fig. 15F). Nervellus subvertical; intercepted near posterior end of vein. Hind femur reticulate coriaceous; 4.6–5.0 (HT: 4.7) × as long as maximum depth in lateral view. Tarsal claws simple.

Metasoma finely and sparsely punctate; ISP smooth. T I 1.4–1.7 (HT: 1.55) × as long as maximum width; lateromedian carina obtusely present except for apical part; dorso-lateral carina complete; largely slightly coriaceous. T II 0.65–0.7 (HT: 0.7) × as long as maximum width. Thyridium present; close to anterior margin of T II; flat to slightly depressed; ca. 3.0 × as wide as length. Ovipositor sheath 0.9–1.0 (HT: 1.0) × as long as hind tibia, 1.7–1.9 (HT: 1.9) × as long as T I. Ovipositor straight; apex sharp; apex of lower valve with teeth ( Fig. 78L).

Colouration ( Figs. 15A–G). Body (excluding wings) black to blackish-brown. Setae silver. Subapical part of mandible yellowish-brown. FL V (or VI) to FL IX (or X) with white markings. Tibial spurs and membranous part of metasomal sternites yellow to yellowish-brown. Face sometimes with pair of dark reddish-brown spots along orbit. Posterior margins of each metasomal tergite usually narrowly tinged with red. Wings brownish-hyaline. Veins and pterostigma blackish-brown except for yellowish-brown to yellow wing base.

Male. Unknown.

Distribution. Japan (Honshu).

Etymology. The specific name is from Dr. Takeo Yamauchi, who kindly offered the valuable materials collected by Dr. Mamoru Watanabe in Toyama Prefecture tome.

Bionomics. Unknown.

Remarks. This species resembles Ap. melana in the black body and the shape of areolet but can be distinguished by the longer ovipositor sheath and T I and the colouration of hind tibia (see above key).