Mesochorus pseudolapponicus, Riedel, 2018

Riedel, Ravenhorst Matthias, 2018, Contribution to the Palaearctic species of Mesochorus G (Hymenoptera, Ichneumonidae, Mesochorinae): 1. The M. fulvus-group, Linzer biologische Beiträge 50 (1), pp. 687-716 : 701-702

Mesochorus pseudolapponicus nov.sp. ( figs 60-64 )

Holotypus: (♀) Russia, Yakutia, 9-10 km W of Yakutsk, Vilyujskij trakt (path), 22.VII.1970, leg. D. Kasparyan (St. Petersburg).

Description: Bodylength 6 mm. Flagellawith 41 segments, slender; 1 st flagellomeres length 6.4x width and 0.7x eye length; 2 nd flagellomeres length 4.5x width; preapical flagellomeres almost 3x longer than wide. Temples moderately and roundly narrowed behind eyes, length 0.65x eye width. OOD 0.8. Face coarsely punctate, with central smoothened ridge, sides slightly divergent ventrally, width 1.1x length of clypeus+face and 0.8x eye length. Clypeus with scattered punctures. MI 0.25. Lower mandibular teeth distinctly larger than the upper ones. Genae, malar spaces and ventral 0.1 of facial orbits striate. Occipital carina shortly interrupted medially. Genal carinae reach the hypostomal ones far from mandibular bases, hypostomal carinae not elevated. Pronotum largely smooth; mesoscutum with coarse dense punctures caudal-medially and with superficial punctures laterally; mesopleura with finer dense punctures dorsally and with coarse but scattered punctures ventrally; metapleura with fine scattered punctures. Area basalis rectangular, confluent with area superomedia; area superomedia length c.2.3x width and c.2x longer than area petiolaris, costulae in frontal 0.35; area petiolaris about as long as wide. Hind femora length 5.2x height; hind metatarsi length 0.49x length of hind tibiae; hind claws with about 5-6 narrowly spaced basal teeth; distal fore tarsomeres length 2.6x width. Areolets shortly stalked; 2 nd recurrent veins proximal to their middle, nervuli interstitial; postnervuli intercepted at basal 0.35; pterostigmata wide, length c.2.7x width, radial veins in their distal 0.7. 1 st tergite length 3.0x width; postpetiolus length 1.6x width, smooth; 2 nd tergite length 1.1x width; thyridia roundish. Ovipositor sheaths pilose, length 6.4x height and 0.77x length of hind metatarsi, narrowed in apical half.

Colour: Yellowish-red (including ocellar space and ovipositor sheaths). Palps, mandibles except teeth, genae, facial orbits, hind edges of pronotum, tegulae, and wing bases yellowish. Legs reddish-yellow; hind tibiae yellowish, slightly infuscate in apical 0.1. 2 nd tergite with some reddish-brown lateral suffusion; tergites 3-6 with narrow yellowish hind margins. Pterostigmata brownish, paler proximally and distally.

Males andhosts unknown.

Distribution:Russia(FarEast).

Figures

Figs 60-64: Mesochorus pseudolapponicus nov.sp. ♀ (holotypus): (60) face, (61) propodeum, (62) hind claw, (63) head, (64) ovipositor sheaths.