Ichneumon nudicoxator, 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 : 198-199

Ichneumon nudicoxator nov.sp. (figs 33, 50, 63, 75)

H o l o t y p e: (♀) " Kirgisistan [ Kyrgyzstan], Tschatkal G.-K. (Kara-Bura), 3000 m, 29-31.V.1997, leg. W. Dolin" (ZSM).

D e s c r i p t i o n: ♀: Body length 8.6 mm. Flagellum almost filiform, with 37 flagellomeres; 1 st flagellomere 2.3× longer than wide, c. 14 th flagellomere square, widest flagellomeres 1.2× wider than long; preapical flagellomere 0.80× as long as wide. Head covered with short brownish hairs. Temple slightly and roundly narrowed behind eyes, dorsally 0.8× as long as eye. OED 1.6× and OOD 1.7× ocellar diameter. Frons punctate, partly rugose centrally. Face punctate, with transverse rugae medially. Clypeus slightly convex, with scattered punctures. Gena 1.1× as wide as eye, with scattered punctures ventrally. Mandible not modified, lower tooth smaller than upper tooth. MI 1.3; malar space 1.0× as long as 1 st flagellomere. Genal carina complete, reaching hypostomal carina far from mandibular base; both carinae low.

Mesosoma covered with short brownish hairs. Mesoscutum densely punctate anteriorly, punctures scattered in posterior half. Mesopleuron and metapleuron coarsely and densely rugose-punctate and striate; juxtacoxal carina present. Scutellum almost flat, about as long as wide, with fine scattered punctures, without lateral carina. Propodeum rugose. Area superomedia rectangular, about as long as wide; anterior transversal carina absent. Mid and hind coxae with very scattered punctures ventrally; hind coxa without scopa. Hind femur 3.9× longer than wide, with scattered punctures in ventral half. Tarsi slender, 3 rd mid tarsomere 1.8× longer than wide.

Metasoma strongly oxypygous, hypopygium short. Postpetiolus moderately widened, lateral field punctate, 0.6× as wide as median field; median field finely aciculate. 2 nd tergite 0.70× as long as wide. Gastrocoelus impressed, with few ridges. Thyridium oblique, 1.1× as wide as the interval. 2 nd and 3 rd tergites finely and densely punctate, 2 nd tergite finely rugose-punctate anterior-medially. Ovipositor sheath not extending behind metasomal apex.

Color: black. Mandible partly reddish. Head including antenna and mesosoma entirely black. 1 st to 3 rd tergites red, following tergites black, without ivory spots. Coxae, trochanters and trochantelli black; legs otherwise red; hind metatarsus apically and following hind tarsomeres entirely blackish. Wings with brown suffusion; pterostigma dark brown.

♁ unknown.

R e m a r k: This new species is characterized by the black head and mesosoma, very scattered punctures of mid and hind coxae, large and oblique thyridia and black apical tergites without ivory spots. In the key of Siberian Ichneumon species ( RIEDEL 2018) it runs to I. asiaticus ROMAN , but differs by the longer 1 st flagellomere, scattered punctation of hind coxa, red hind femur and entirely black mesosoma. The punctation of hind coxa resembles I. brevipunctatus RIEDEL , but this new species differs by the larger thyridium and different coloration of the flagellum, metasoma and legs.