Ichneumon altaicurtulus, Riedel, 2018

Riedel, Matthias, 2018, Contribution to the Siberian species of Ichneumon LINNAEUS (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 50 (2), pp. 1509-1562 : 1511

Ichneumon altaicurtulus nov.sp. (figs 19, 63)

T y p e m a t e r i a l: Holotype: ♀ " 12-15 VII 2001, 2000 m, Nura vill., NE Altai Mt. rng., S Kirgizstan, leg. Osipov " (coll. Riedel).

D e s c r i p t i o n: Body length 11 mm. Antenna slightly lanceolate, with 33 flagellomeres; 1 st flagellomere 1.8x longer than wide, 7 th flagellomere square, widest flagellomeres c.0.6x as long as wide; preapical flagellomere 0.75x as long as wide. Temple slightly and roundly narrowed behind eye. OOD 1.5. Gena 1.0x as wide as eye, with scattered punctures in ventral half. Malar space c.1.0x as long as width of mandibular base and 0.8x as long as 1 st flagellomere. Genal carina complete, not interrupted ventrally. Hypostomal carina slightly elevated.

Mesosoma covered with brownish hairs. Mesoscutum densely punctate, lateral field with rather dense punctures centrally. Mesopleuron and metapleuron coarsely striate-punctate; coxal carina present. Scutellum flat, about as long as wide, with fine very scattered punctures. Area superomedia rectangular, about as long as wide; costula absent. Area petiolaris without lateral carina. Hind coxa densely punctate, without scopa. Hind femur 3.7x longer than wide, with scattered punctures basally and in ventral 1/3. Hind tibia without denticular spurs apico-externally. Tarsomeres slender, 3 rd mid tarsomere 1.9x longer than wide.

Metasoma strongly oxypygous, hypopygium short. Postpetiolus strongly widened, lateral field 0.7x as wide as the median one, median field with rather coarse regular aciculation. 2 nd tergite 0.8x as long as wide. Gastrocoelus impressed, with several ridges; thyridium slightly oblique, c.0.8x as wide as the interval. 2 nd and 3 rd tergites densely punctate and finely rugose medially. Ovipositor sheath distinctly extending behind metasomal apex.

Color: Black. Scapus, pedicel and flagellomeres 1-12 yellowish-red. Mandible except teeth, clypeus largely and facial and frontal orbits narrowly reddish. Collare, hind edge of pronotum and tegula red. Scutellum yellow. 2 nd and 3 rd tergites yellow, gastrocoelus reddish, 3 rd tergite with wide basal (1/3 of its length) and narrow apical blackish bands. 5 th to 7 th tergite with very wide and large yellow stripes covering the whole dorsal area. Coxae and trochanters black; legs otherwise reddish-yellow; hind femur black, its basal 1/3 and hind trochantellus red; hind tibia and tarsus yellow; apical 0.2 of hind tibia and tips of hind tarsomeres reddish. Wings with yellowish tint, pterostigma yellow.

Males unknown.

T a x o n o m i c a l r e m a r k This species belongs to group G 1 sensu HILPERT (1992) and runs to I. caedator GRAVENHORST in his key. It differs by the slenderer hind femur and yellow hind tibia and hind tarsus with reddish tips. The new taxon also resembles Ichneumon curtulus KRIECHBAUMER and can be differentiated by its slenderer legs and different color pattern of 3 rd tergite.

However, this species might represent a subspecies of Ichneumon curtulus which have been previously reported from the Western Palaearctic region, Kazakhstan and Iran ( YU et al. 2016).