Mesochorus virgatus 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 : 15

26. Mesochorus virgatus SCHWENKE, 1999

( Figs 25a–d )

Holotype: "() Dessau 4 SSO 16.8.88 K.H. Zoerner; 92/88 Muldauenwald" [, no. 92/88, Germany: Saxony- Anhalt , 4 km SSE of the district Dessau of town Dessau-Rosslau, carr woodland of river Mulde, 16.8.1988, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Both antennae, both fore legs. Body length 3.2 mm. Temple slightly narrowed behind eye, 0.7x as long as the eye width. OOD 1.8. Face very wide, sides divergent ventrally, 1.2x wider than the length of clypeus+face and 1.1x wider than the eye length, densely and coarsely punctate, with weak sublateral impressions below antennae. Ventral 0.5 of facial orbit and malar space widely striate. MI 0.9. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with dense coarse punctures apico-medially and laterally; mesopleuron with fine punctures dorsally and almost smooth ventrally; metapleuron with superficial punctures. Area basalis triangular, about as long as wide; area superomedia short, 1.5x longer than wide and 0.8x as long as the area petiolaris, costula in the middle; area petiolaris very large (ca. 0.5x as long as propodeum), 0.95x as long as wide. Hind femur 4.8x longer than wide; hind metatarsus 0.38x as long as the hind tibia; hind claws with one visible basal tooth. Areolet shortly stalked; 2 nd recurrent vein in its middle; nervulus slightly postfurcal (by 1x its width); pterostigma 3.0x longer than wide, radial vein in its distal 0.62; distal part of radial vein long and weakly sinusoid. 1 st tergite 2.4x longer than wide; postpetiolus 1.25x longer than wide, with central rim; 2 nd tergite about as long as wide; thyridium roundish. Ovipositor sheath pilose, 8.4x longer than wide and 1.2x longer than the hind metatarsus, narrowed over its whole length.

Colour: Head yellow; face with some brownish spots; facial orbit and ventral half of frontal orbit widely, clypeus, malar space, mandible except teeth, and gena creamyellow; frons medially, ocellar field and dorsal stripe of occiput brown. Mesosoma reddish; pronotum and frontodorsal and ventral spots on mesopleuron yellow. Tegula with brownish spots. Basal 2/3 of propodeum brown. Metasoma black; 2 nd tergite with reddish band in the apical 2.5/10 of tibial length; 3 rd and 4 th tergites reddish, with central brownish bands; following tergites brown, with yellowish hind margins. Legs reddish-yellow; hind tibia slightly darker in the apical 1.5/10 of tibial length. Pterostigma hyaline.

Remark: This species is correctly placed in the key for

the pectoralis -group ( SCHWENKE, 1999: 95–98).

Figures

Fig. 25a-d: Holotype of Mesochorus virgatus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.