Ichneumon flavocoxalis, Riedel, 2020

Riedel, Matthias, 2020, Contribution to the knowledge of Ichneumoninae of Siberia and Far East Russia (Hymenoptera, Ichneumonidae), Beiträge Zur Entomologie = Contributions to Entomology 70 (2), pp. 365-386 : 376

Ichneumon flavocoxalis spec. nov.

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( Figs 5 , 22 , 28 )

Holotype:  “ Russia, Primorskij Kray, Ryazanovska , 14 km SW Slavyanka, 42°48' N 131°12' E, 50 m, 16.VI. 1993, leg. A. Taeger ” ( SDEI).

Description: . Body length 19 mm. Flagellum bristleshaped, with 44 flagellomeres; 1 st flagellomere 2.4x longer than wide, 8 th flagellomere square, widest flagellomeres 1.2x wider than long; preapical flagellomere 1.2x longer than wide. Temple moderately and roundly narrowed behind eye, dorsally 0.8x as long as eye. Distance of lateral ocellus to eye 1.3x ocellar diameter. Frons coarsely rugose-punctate. Face densely rugose-punctate and granulate, matte. Clypeus densely rugose-punctate, ± shining. Gena 1.3x wider than eye, densely rugose-punctate. Malar space 1.1x longer than width of mandibular base. Mandible with two teeth, lower tooth smaller than upper one. Genal carina complete, reaching hypostomal carina away from mandibular base; both carinae low.

Mesosoma covered with brownish hairs. Notaulus indistinctly impressed. Mesoscutum densely and finely rugose-punctate, matte. Mesopleuron and metapleuron densely rugose-punctate; juxtacoxal carina present. Scutellum moderately elevated, slightly wider than long, with dense punctures, without lateral carina. Propodeum completely carinate. Area superomedia hexagonal, 1.1x wider than long, rugose; costula reaching area superomedia slightly frontal to its middle, costula weak laterally. Area externa and area petiolaris rugose. Outer dentiparal edge with short blunt tooth. Hind coxa with fine dense punctures, without scopa. Hind femur densely punctate, 4.0x longer than wide. 3 rd mid tarsomere c. 1.6x longer than wide.

Areolet pentagonal, frontal distance of intercubiti 3x their diameter; 2 nd recurrent vein slightly distal to its middle. Nervulus slightly postfurcal (1x its width).

Metasoma strongly oxypygous, hypopygium short. Postpetiolus strongly widened, lateral field 0.9x as wide as median field, with coarse punctures; median field with very fine and superficial aciculation. 2 nd tergite very wide, 1.35x wider than long. Gastrocoelus impressed, with weak ridges; thyridium slightly oblique, c. 0.65x as wide as the interval. 2 nd and 3 rd tergites very finely and densely rugose-punctate, ± matte. Following tergites granulate, slightly shining. 2 nd to 4 th sternites with median folds. Ovipositor sheath slightly extending behind metasomal apex.

Color: Black. Flagellomeres 5-13 with ivory stripes. Collare and upper margin of pronotum, spot on tegula, subtegular ridge, scutellum, posterolateral spots on 1 st to 3 rd tergites (smaller and weak on 3 rd tergite) and large median spots on 5 th to 7 th tergites yellow. Coxae and trochanters black; all coxae with dorsal yellow spots; hind trochantellus dark reddish. Legs otherwise red; fore and mid femora with blackish ventral suffusion; hind femur narrowly black apically; all tibiae with subbasal yellow rings or stripes; hind tibiae infuscate in apical 0.2; hind tarsus black. Wings with yellowish tint; pterostigma yellow.

: unknown.

Remark: This large species belongs to group B sensu HILPERT (1992), but differs from all known species in this group by its black basal tergites with posterolateral yellow spots. In the key of Siberian Ichneumon species ( RIEDEL, 2018) it runs to couplet 6: Ichneumon quaesitorius LINNAEUS , but it can be differentiated by the yellow spots on hind coxa and basal tergites and the subbasal yellow bands of all tibiae.

Figures

Figs 1–8: Habitus of: 1. Aoplus ocellator spec. nov. , 2. Chasmias paludator sibiricus subspec. nov., 3. Coelichneumon septenus TOWNES et al., new , 4. Protichneumon nigriventris spec. nov. , 5. Ichneumon flavocoxalis spec. nov., 6. Ichneumon megextensorius spec. nov., 7. Ichneumon pilocephalus spec. nov., , 8. Ichneumon taegeri spec. nov. .

Figs 21–23: Head from dorsal: 21. Ichneumon brevimaculatus spec. nov. : 22. Ichneumon flavocoxalis spec. nov. , 23. Ichneumon megextensorius spec. nov. , 24. Ichneumon flavotibialis spec. nov. – Figs 25–26: Protichneumon nigriventris spec. nov. : 25. Head from dorsal, 26. face.

Figs 27–34: Scutellum and propodeum: 27. Ichneumon brevimaculatus spec. nov. : 28. Ichneumon flavocoxalis spec. nov. , 29. Ichneumon polyxanthus (KRIECHBAUMER) , 30. Ichneumon megextentensorius spec. nov. , 31. Ichneumon pilocephalus spec. nov. , 32. Ichneumon flavotibialis spec. nov. , 33. Monontos baikalensis spec. nov. : 34. Protichneumon nigriventris spec. nov.