Mesochorus hyalinus SCHWENKE, 1999

Riedel, Matthias, 2018, The types of Mesochorus GRAVENHORST (Hymenoptera, Ichneumonidae, Mesochorinae) described by W. SCHWENKE and deposited in the Senckenberg Deutsches Entomologisches Institut, Beiträge Zur Entomologie = Contributions to Entomology 68 (1), pp. 1-29 : 8-9

13. Mesochorus hyalinus SCHWENKE, 1999

( Figs 12a–d )

Holotype: "() Jena 10 km NO 19.6.88 K.H. Zoerner "

[, without no., Germany: Thuringia, 10 km NE of Jena,

19.6.1988, leg. K.H. Zoerner] ( SDEI) .

Description: Missing: Left antenna completely, right flagellum. Body length 6.0 mm. Temple strongly and linearly narrowed behind eye, 0.3x as long as the eye width. OOD 0.8, ocellar field elevated. Face with parallel sides, superficially punctate, 0.98x as wide as the length of clypeus+face and 0.77x as wide as the eye length. MI 0.2. Lower mandibular tooth slightly longer than the upper one. Malar space and mandible except teeth striate. Mesoscutum with rather coarse but superficial punctures; mesopleuron and metapleuron almost smooth. Area basalis triangular, narrow, 1.5x longer than wide; area superomedia 2.4x longer than wide and 2.0x longer than the area petiolaris, costula in frontal 4/10 of length of area superomedia; area petiolaris 0.8x as long as wide. Hind femur 4.7x longer than wide; hind metatarsus 0.48x as long as the hind tibia. Hind claws with five basal teeth. Areolet pointed; 2 nd recurrent vein in its middle; nervulus interstitial; pterostigma 3.6x longer than wide, radial vein in its distal 0.68. 1 st tergite slender, 3.0x longer than wide; postpetiolus 1.65x longer than wide; smooth; 2 nd tergite 1.05x longer than wide; thyridium large, transversal-oval. Ovipositor sheath densely pilose, 7.0x longer than wide and 0.88x as long as the hind metatarsus, slightly narrowed in the apical 3/10 of tibial length.

Colour: Reddish. Metasoma reddish; 1 st tergite in apical half and 2 nd tergite in basal half with diffuse brownish tints, 2 nd tergite with a large triangular reddish mark apically. Legs yellowish, hind coxa more reddish; hind tibia and tarsus pale-yellow, hind tibia in apical 1/10 of tibial length (0.5x of tibial width) and tips of hind tarsomeres brownish-red. Pterostigma hyaline.

Remark: This species does not belong to the orbitalis - group, but should be included in the declinans -group sensu SCHWENKE. In the key for the declinans -group ( SCHWENKE, 1999: 80–83) it runs to no. 31 ( Mesochorus boreomontanus SCHWENKE ), but differs by the reddish mesosoma and almost smooth meso- and metapleuron.

Valid name: Mesochorus jenensis SCHWENKE, 2002 , new name for Mesochorus hyalinus SCHWENKE, 1999 , preoccupied by DASCH, 1974.

Figures

Fig. 12a-d: Holotype of Mesochorus hyalinus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.