Darwin wasps of the subfamily Pimplinae (Hymenoptera: Ichneumonidae) of Mexico: genera Apechthis Förster, Itoplectis Förster and Pimpla Fabricius Author Khalaim, Andrey I. Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, Cd. Victoria, Tamaulipas, Mexico. Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia. Author Ruíz-Cancino, Enrique 0000-0003-4305-6568 Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, Cd. Victoria, Tamaulipas, Mexico. Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia. & https: // orcid. org / 0000 - 0003 - 4305 - 6568 text Zootaxa 2021 2021-11-25 5071 4 451 491 journal article 3304 10.11646/zootaxa.5071.4.1 250bb9d8-a388-4795-9d57-cf58791d768a 1175-5326 5726393 52E0E77B-D285-4F99-B623-4AA2BF95977E 11. Pimpla oaxacana Khalaim & Ruíz-Cancino , sp. nov. ( Fig. 21 ) Material examined. Holotype female ( UAT ), Mexico , Oaxaca , Cuilapam , nogal, Malaise trap , 26.iii.2005 , coll. J.M. Maldonado. Description. Female . Fore wing length 9.4 mm . Head strongly narrowed behind eyes in dorsal view. Posterior ocellus separated from eye by 0.6× its own diameter. Mandible with upper tooth distinctly longer than the lower tooth. Clypeus in profile proximally slightly convex, apically slightly concave; in front view 1.75× as broad as long, with lower margin weakly concave. Malar space 0.6× as long as basal mandibular width. Face convex, densely punctate (punctures sparse and weak ventrally, coarse and rather deep dorsally), more or less smooth between punctures, with longitudinally striate median prominence. Mesoscutum weakly shining, dull, with very fine and mostly indistinct punctures, rather densely pubescent. Scutellum weakly convex, almost smooth, with fine indistinct punctures. Mesopleuron with fine and even setiferous punctures, smooth and shining between punctures. Epicnemial carina reaching about the level of centre of pronotum. Metapleuron weakly convex, mostly with shallow indistinct punctures, smooth and impunctate anteroventrally, corrugate posteriorly. Submetapleural carina complete, anteriorly strongly raised, rounded. Pleural carina weak but complete. Propodeum dorsally and laterally with dense transverse wrinkles, posteriorly smooth, with dorsoposterior corners not swollen. Fore wing with vein RS almost straight, curved distally. Vein 1cu-a (nervulus) distinctly postfurcal, distal to base of M&RS (basal vein) by 0.3 its own length. Discosubmarginal cell very sparsely hirsute, anteriorly glabrous. First tergite of metasoma short, about as long as posteriorly broad, in lateral view with dorsal surface convex behind middle. Tergite 1 dorsally polished in its basal 0.6, densely and coarsely punctate posteriorly but with posterior white end smooth. Tergites 2–5 densely and coarsely punctate reticulate but with posterior white end smooth, with weak and inconspicuous basolateral grooves. Tergite 6 finely coriaceous, dull, with shallow moderately dense punctures. Tergite 7 finely coriaceous, dull, with fine and sparse punctures. Laterotergites extremely narrow; laterotergite 5 about 0.25× as broad as long. Ovipositor robust and straight, with fine subapical teeth ventrally, its sheath 0.85× as long as hind tibia. Head with antenna, mandible and mouth parts black; lateral corners of clypeus reddish. Mesosoma black, pronotum white marked ventrally and with narrow white stripe on its dorsal margin, mesopleuron with subalar prominence apically whitish, scutellum with posterior 0.3 white, postscutellum entirely white. Tegula blackish, peripherally pale and with extreme posterior corner whitish. Wings slightly yellowish. Veins light brown to brown. Pterostigma brownish black with small white mark basally and brownish mark apically. All coxae and trochanters black; fore trochanter whitish on its anterior side, hind trochantellus reddish apically. All femora dark red, fore femur with inconspicuous orange markings, hind femur apically narrowly black. Fore and mid tibiae yellowish orange with infuscate marks on external surface. Hind tibia black, slightly reddish on its internal surface. Fore and mid tarsi reddish. Hind tarsus black, claws dark red to black. Metasoma black, tergites 1–4 with yellow posterior band, tergites 5–7 also yellow banded posteriorly but the bands becoming narrower on posterior tergites. Sternites mostly blackish, on margins and peripherally whitish. Ovipositor sheath black. Male . Unknown. Etymology. This species is named after the type locality, State of Oaxaca . Distribution. Mexico ( Oaxaca ). Comparison. The new species differs from three other species with black tergites and with a pale band posteriorly ( P. albomarginata , P. carlosi and P. xalapana ) by the shorter malar space, shorter first tergite, black scape of antenna and mid and hind coxae.