Ichneumon nigroantennator, Riedel, 2021

Riedel, Matthias, 2021, A New Contribution to the Knowledge of the East Palaearctic Ichneumoninae (Hymenoptera, Ichneumonidae), Linzer biologische Beiträge 53 (1), pp. 171-240 : 196-197

Ichneumon nigroantennator nov.sp. ( figs 20 , 60, 72)

H o l o t y p e: (♀) " Kazakhstan mer.-west, Alma-Arasan, 43,2N 76,8E, 15 km S Almaty, leg. K. Denes jr., 27.5.1994 " (Linz).

D e s c r i p t i o n: ♀: Body length 10.3 mm. Flagellum almost filiform, with 36 flagellomeres; 1 st flagellomere 2.2× longer than wide, widest flagellomeres 1.2× wider than long; preapical flagellomere 0.86× as long as wide. Head covered with brownish hairs. Temple slightly and roundly narrowed behind eyes, dorsally 1.0× as long as eye. Ocelli small, OED 2.0× and OOD 2.1× ocellar diameter. Vertex and occiput coarsely and transversely rugose-punctate. Frons and face rugose-punctate. Clypeus with rather dense punctures and some fine longitudinal rugae medially; apical margin straight. Gena wide, 1.2× as wide as eye, with dense and partly rugose punctures in ventral half. Mandible not modified, lower tooth smaller than upper tooth. MI 1.5; malar space 1.0× as long as 1 st flagellomere. Genal carina complete, reaching hypostomal carina far from mandibular base; hypostomal carina slightly elevated.

Mesosoma covered with brownish hairs. Mesoscutum densely punctate, ± shining. Meso- and metapleuron coarsely and densely rugose-punctate; juxtacoxal carina present. Scutellum slightly elevated, slightly wider than long, with fine scattered punctures, without lateral carina. Propodeum rugose. Area superomedia hexagonal, 1.3× wider than long; anterior transversal carina indistinct. Hind coxa coarsely punctate, with finer dense punctures apico-ventrally, without scopa. Hind femur 3.9× longer than wide, with dense punctures. Tarsi slender, 3 rd mid tarsomere 1.6x longer than wide.

Metasoma strongly oxypygous, hypopygium short. Postpetiolus moderately widened, lateral field rugose-punctate, 0.75× as wide as median field; median field finely aciculate. 2 nd tergite 0.67× as long as wide. Gastrocoelus impressed, with strong ridges. Thyridium large, almost transverse, 1.1× wider than the interval. 2 nd and 3 rd tergites finely and densely rugose-punctate, 2 nd tergite finely striate between thyridia. Ovipositor sheath shortly extending behind metasomal apex.

Color: black. Palps brownish, mandible reddish centrally. Flagellum, head and mesosoma otherwise entirely black. 2 nd and 3 rd tergites red, apical tergites without ivory spots. Coxae and trochanters black; fore and mid legs red, fore femur basally and mid femur mainly blackish; mid tibia weakly infuscate apically; hind femur black; hind tibia red,

black in apical 0.24; hind metatarsus red, infuscate apically, hind tarsus otherwise black. Wings with distinct brownish infuscation; pterostigma black.

♁ unknown. R e m a r k: This new species is characterized by its black head and mesosoma, red 2nd

and 3 rd tergites and black apical tergites. In the key of Siberian Ichneumon species ( RIEDEL 2018) it runs to I. kazdikistanus HEINRICH, but differs by its wide and transverse thyridia and entirely black apical tergites.

Figures

Figs 19-22: Habitus from dorsal: (19) Ichneumon melanosomops nov.sp. ♀, (20) Ichneumon nigroantennator nov.sp. ♀, (21) Ichneumon nigrostriatus nov.sp. ♀, (22) Ichneumon paraltaicola nov.sp. ♀.