Mesochorus caucasicus, 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 : 692-693

Mesochorus caucasicus nov.sp. ( figs 65-69 )

Holotypus: (♀) Russia: North Caucasus, Stavropol Terr.: Karachaevo-cherkessiya, Teberdinskij Natural Reserve, 10 km S of Archyz, valley of Kyzgych River, 2.VII.1976, leg. D. Kasparyan (St. Petersburg).

Description: ♀: Bodylength 7 mm. Flagellawith 47 segments; 1 st flagellomeres length 6x width and 0.73x eye length; 2 nd flagellomeres length 3.8x width, preapical flagellomeres c.2x longer than wide. Temples strongly narrowed behind eyes, length 0.55x eye width. OOD 1.2. Face wide, with slightly divergent sides ventrally, width c.1.2x length of clypeus+face and c.1.0x eye length, coarsely punctate. Frons and clypeus smooth, with scattered punctures. MI 0.2. Mandibles with two equal teeth. Malar spaces distinctly striate. Occipital carina shortly interrupted medially. Genal carinae reach the hypostomal ones far from mandibular bases. Pronotum with fine granulation and very superficial punctures; mesoscutum with dense coarse punctures caudal-medially and with superficial punctures laterally; mesopleura with fine dense punctures dorsally and scattered punctures ventrally; metapleura with fine and moderately dense punctures. Hind femora length 5.7x height; hind metatarsi length c.0.47x length of hind tibiae; hind claws with 5-6 rather short teeth in basal 2/3; distal fore tarsomeres slender, length c.3x width. Areolets pointed; 2 nd recurrent veins slightly distal to their middle; nervuli interstitial; postnervuli intercepted in basal 0.3; pterostigma length c.3.3x width, radial veins in their distal 0.7. 1 st tergite length 3.4x width; postpetiolus length 1.8x width, smooth; 2 nd tergite length 1.3x width. Ovipositor sheaths pilose, length 7.2x height and 0.9x hind metatarsi length, slightly narrowed apically, not bent apically.

Colour: Yellowish-brown (including ocellar space and ovipositor sheath). Palps, mandibles except teeth, genae, clypeus, wide facial and frontal orbits, tegulae, hind edges of pronotum, wing bases, fore and middle coxae and trochanters cream-yellow. Mesoscutum with an indistinct brownish stripe frontal-medially. 2 nd tergite with some brownish-red suffusion laterally. Pterostigmata hyaline-ochreous.

Males andhosts unknown.

Distribution:Russia(Caucasus).

Figures

Figs 65-69: Mesochorus caucasicus nov.sp. ♀ (holotypus): (65) face, (66) propodeum, (67) hind claw, (68) head, (69) ovipositor sheaths.