Ichneumon nigrostigmaticus, Riedel, 2018

Riedel, Matthias, 2018, Contribution to the Siberian species of Ichneumon LINNAEUS (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 50 (2), pp. 1509-1562 : 1523-1524

Ichneumon nigrostigmaticus nov.sp. ( figs 10 , 31 , 54 , 73 )

M a t e r i a l e x a m i n e d: Holotype: ♀ " 1-5 vii 2003, 2000 m, SW Tannu-Ola Mt reg., Sogly vill., SW Tuwa reg., S Siberia, leg. Vastchenko " (coll. Riedel)

D e s c r i p t i o n: Body length 14 mm. Antenna slightly lanceolate, with 41 flagellomeres; 1 st flagellomere 1.85x longer than wide, c.7 th flagellomere square, widest flagellomeres c.0.75x as long as wide; preapical flagellomere 0.67x as long as wide. Temple moderately and roundly narrowed behind eye. Ocelli small, OOD 1.8. Frons densely rugose-punctate. Face densely rugose-punctate and granulate. Clypeus densely punctate, with some coarse striae in apical 1/2. Gena wide, 1.3x as wide as eye, densely punctate, but with a small ventral area with scattered punctures. Malar space 1.4x as long as width of mandibular base and 1.5x as long as 1 st flagellomere. Genal carina complete, reaching the hypostomal one far from mandibular base (distance as long as width of mandibular base). Hypostomal carina narrow.

Mesosoma covered with brownish hairs. Mesoscutum rather densely punctate, lateral field centrally with scattered punctures. Mesopleuron and metapleuron coarsely rugosepunctate; coxal carina absent. Scutellum slightly elevated, slightly longer than wide, with fine scattered punctures. Area superomedia about square; costula absent. Area petiolaris not bordered laterally. Hind coxa densely punctate, with rather long brownish hairs, but without scopa. Hind femur slender, 4.1x longer than wide, densely punctate, with scattered punctures in ventral 1/5. Hind tibia with 3-4 denticular spurs apico-externally. Tarsomeres slender, 3 rd mid tarsomere c.1.7x longer than wide.

Metasoma strongly oxypygous, hypopygium short. Postpetiolus strongly widened, median field not distinctly separated and c.1.6x wider than lateral field, with very fine and regular aciculation; lateral field punctate and with fine aciculation. 2 nd tergite 0.8x as long as wide. Gastrocoelus strongly impressed, with several strong ridges; thyridium slightly oblique, c.0.8x as wide as the interval. 2 nd and 3 rd tergites with fine dense punctures and granulation, basal third of 2 nd tergite finely rugose medially. Ovipositor sheath slightly extending behind metasomal apex.

Color: Black. Flagellomeres 1-12 completely and mandible centrally red. Mesosoma black; collare, tegula and central spot on scutellum reddish. Lateral field of postpetiolus with reddish stripe, 2 nd tergite completely red, 3 rd tergite only laterally. 6 th and 7 th tergites diffusely reddish apically, without distinct pale spots. Coxae and trochanters black; legs otherwise red; fore and mid femora basally blackish; hind femur black, in basal 1/10 and apical 1/5 reddish. Wings with brownish tint, pterostigma black, paler proximally.

Males unknown.

T a x o n o m i c a l r e m a r k The species belongs to group G 4 sensu HILPERT (1992). It is characterized by the strongly sculptured clypeus, slender hind femur and characteristical coloration of metasoma.

Figures

Figs 9-12: Habitus of: (9) Ichneumon mesonotator nov.sp.; (10) I. nigrostigmaticus nov.sp.; (11) I. orientopodius nov.sp.; (12) I. paravafer nov.sp.

Figs 27-32: Head from dorsal of: (27) Ichneumon inquinatops nov.sp.; (28) I. lanceolator nov.sp.; (29) I. mandibulatus nov.sp.; (30) I. mesonotator nov.sp.; (31) I. nigrostigmaticus nov.sp.; (32) I. orientopodius nov.sp.

Figs 53-56: Scutellum and propodeum of: (53) Ichneumon mesonotator nov.sp.; (54) I. nigrostigmaticus nov.sp.; (55) I. orientopodius nov.sp.; (56) I. paravafer nov.sp.

Figs 73-76: Postpetiolus and 2nd tergite of: (73) Ichneumon nigrostigmaticus nov.sp.; (74) I. orientopodius nov.sp.; (75) I. paravafer nov.sp.; (76) I. paravulnerator nov.sp.