Syspasis nigrotibialis, Riedel, 2021

Riedel, Matthias, 2021, Revision of the Palaearctic species of Syspasis TOWNES, 1965 (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 53 (2), pp. 775-810 : 789-790

Syspasis nigrotibialis nov.sp. (figs 8, 41, 55)

H o l o t y p e: (♀) S Kirgizstan, NE Altai Mt. rng., Nura vill., 2000 m 12-15.VII.2001, leg. Osipov (ZSM).

M a t e r i a l e x a m i n e d: 1 ♀ from Kyrgyzstan.

D e s c r i p t i o n: ♀: Body length 8.7 mm. Flagellum with 37 flagellomeres, slightly lanceolate; 1 st flagellomere 2.6× and 2 nd flagellomere 2.3× longer than wide, combined length 0.69× eye length; 13 th flagellomere square; widest flagellomeres 1.2× wider than long. Temple strongly and roundly narrowed behind eye, dorsally 0.5× as wide as eye. OED 1.2× ocellar diameter. Frons rugose-punctate. Face densely punctate and finely granulate. Clypeus moderately convex, punctate; apical margin sharp, straight. Gena with scattered punctures ventrally. MI 1.1. Mandible with two teeth, lower tooth very small and moderately bent inwards (by 45°). Genal carina reaching hypostomal carina away from mandibular base, hypostomal carina moderately elevated (by width of distal maxillary palp). Mesosoma covered with brownish hairs. Side of pronotum mainly striate-rugose; upper margin punctate. Epomia strong. Notaulus indistinct. Mesoscutum densely punctate, shining. Mesopleuron and metapleuron densely rugose-punctate; speculum punctate; juxtacoxal carina present. Scutellum moderately elevated, slightly longer than wide, with dense punctures and lateral carina in anterior 0.5. Area basalis with strong median tubercle. Area superomedia heart-shaped, 1.3× wider than long; anterior transversal carina posterior to its middle. Hind coxa densely punctate, without scopa. Hind femur densely punctate, 4.4× longer than wide. Hind tibia with c. 10 denticular spurs externally. Areolet quadrilateral, veins 2rs-m and 3rs-m meeting frontally; vein 2m-cu distad its middle. Vein 1cu-a slightly antefurcal. Metasoma oxypygous, 2 nd to 4 th sternites with median folds. Postpetiolus strongly widened, without dorsal carinae. Lateral field about as wide as median field, punctate; median field aciculate and punctate. Gastrocoelus distinctly impressed, with longitudinal ridges. Thyridium almost transverse, 1.0× as wide as the interval between thyridia. 2 nd tergite 0.85× as long as wide. 2 nd to 4 th tergites densely and coarsely punctate and ± shining; basal third of 2 nd tergite with coarse striae medially. Ovipositor sheath slightly extending behind metasomal apex.

Color: black. Flagellum black. Narrow stripes on vertex and upper outer orbit ivory. Mesosoma entirely black. 1 st tergite black; 2 nd tergite red, black between thyridia. 3 rd to 6 th tergites entirely red; 7 th tergite brownish. Coxae, trochanters and trochantelli black; all femora and fore tibia and tarsus reddish; mid and hind tibiae and tarsi black, hind tibia with dark reddish suffusion internally. Wings with brown infuscation; pterostigma black.

♁ unknown.

Hosts: unknown.

T a x o n o m i c a l r e m a r k: Thisnewspeciesiscloselyrelatedto S. nigrithorax nov.sp. It differs by wider malar space, slenderer hind femur and mainly black mid and hind tibiae. This species might only represent a subspecies of S. nigrithorax , but more material and the knowledge of the associated ♁ might solve this taxonomical question.