Mesochorus zoerneri 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 : 15-16

27. Mesochorus zoerneri SCHWENKE, 1999

( Figs 26a–d )

Holotype: "() Dessau 6,6 SSW 13.8.85 K.H. Zoerner; 78/85 frische Waldwege" [, no. 78/85, Germany: Saxony-Anhalt, 6.6 km SSW of the district Dessau of town Dessau-Rosslau , mesophilic forest trails, 13.8.1985, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Left flagellum broken off, glued on card; left flagellomeres from 24 th on and right flagellomeres from 28 th on, right fore wing. Body length 4.8 mm. 1 st flagellomere 5.0x longer than wide and 0.53x as long as the eye, 2 nd flagellomere 3.4x longer than wide. Temple strongly narrowed behind eye, 0.48x as long as the eye width. OOD 1.1. Face coarsely and densely punctate, wide, 0.85x as wide as the eye length and 1.15x wider than the length of face+clypeus, sides slightly convergent ventrally. MI 0.5. Mandible with two equal teeth. Genal carina reaching the hypostomal carina close to mandibular base. Mesoscutum with coarse and moderately dense punctures; mesopleuron with finer and dense punctures dorsally and coarse and moderately dense punctures ventrally; metapleuron with fine superficial punctures. Scutellum with apical tubercle. Hind femur 4.7x longer than wide; hind metatarsus 0.43x as long as the hind tibia; hind claws with about 7 long and dense teeth. Area basalis almost rectangular, slightly wider than long; area superomedia 1.5x longer than wide and 0.75x as long as the area petiolaris, costula in frontal 7/10 of length of area superomedia; area petiolaris very large (0.5x propodeal length), 1.25x longer than wide. Areolet pointed, oblique, 2 nd recurrent vein proximal to its middle; nervulus slightly postfurcal (by 0.5x its width); pterostigma wide, 2.6x longer than wide, radial vein in its distal 0.67. 1 st tergite 2.8x longer than wide; postpetiolus 1.15x longer than wide, smooth; 2 nd tergite 0.8x as long as wide; thyridium comma-shaped. Ovipositor sheath long and narrow, pilose, 8.4x longer than wide and 1.3x longer than the hind metatarsus, slightly narrowed in its apical 3/10 of tibial length.

Colour: Black. Antennae brown. Face reddish-brown; facial orbit, triangular orbital spot opposite to antennae, malar space, clypeus, mandible except teeth and gena cream-yellow; outer orbit reddish-yellow. Mesosoma blackish; pronotum yellowish frontally; hind edge of pronotum, tegula and wing base cream-yellow. 1 st sternite completely and 1 st tergite basally reddish-yellow, 2 nd tergite with cream-yellow band in the apical 1.5/10 of tibial length. Legs reddish-yellow, hind tibia not darkened apically. Pterostigma brown, proximal and distal edges paler.

Remark: This taxon is correctly placed in the key for the

politus -group ( SCHWENKE, 1999: 46).

Figures

Fig. 26a-d: Holotype of Mesochorus zoerneri SCHWENKE: a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.