Mesochorus solus 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 : 14

24. Mesochorus solus SCHWENKE, 1999

( Figs 23a–d )

Holotype: "() Dessau 1,7 NW 29.9.1993 395/93 H. Zoerner " [, no. 395/93, Germany: Saxony-Anhalt, 1.7 km NW of the district Dessau of town Dessau- Rosslau, 29.9.1993, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Both antennae completely (head broken off and glued on card). Body length 4.0 mm. Temple strongly narrowed behind eye, ca. 0.4x as long as the eye width. OOD 1.15. Face with dense fine punctures, 1.03x wider than the length of face+clypeus and 0.86x as wide as the eye length, with parallel sides. Clypeus with scattered punctures. Malar space striate. MI 0.3. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from the mandibular base. Mesoscutum with fine scattered punctures, strongly shining; mesopleuron with scattered fine hairpunctures dorsally and very scattered hair-punctures ventrally; metapleuron with scattered and fine punctures. Area basalis rectangular, about as long as wide; area superomedia 2.3x longer than wide and 1.8x longer than the area petiolaris, costula in frontal 4/10 of length of area superomedia; area petiolaris 0.92x as long as wide. Hind femur 4.3x longer than wide; hind metatarsus 0.47x as long as the hind tibia; hind claws with four or five small teeth, middle tooth longest. Areolet pointed, 2 nd recurrent vein slightly proximal to its middle; nervulus slightly postfurcal (0.5x of its width); pterostigma 3.5x longer than wide, radial vein in its distal 0.6. 1 st tergite 2.5x longer than wide; postpetiolus 1.2x longer than wide, smooth; 2 nd tergite 0.9x as long as wide; thyridium transversal-oval. Ovipositor sheath pilose, hairs about as long as width of sheath, 6.7x longer than wide and about as long as the hind metatarsus, slightly narrowed in the apical 3/10 of tibial length.

Colour: Black. Face reddish, with brownish stripes; clypeus, facial orbit, ventral half of frontal orbit, mandible except teeth, malar space and gena cream-yellow; outer orbit reddish-yellow. Mesosoma blackish; hind edge of pronotum, tegula and wing base cream-yellow. Metasoma black; 2 nd tergite yellowish in the apical 1.5/10 of tibial length; 3 rd tergite and following tergites yellow-red centrally, with greyish-yellow hind margins. Legs yellowred, hind coxa and femur more reddish; hind tibia yellow, brownish basally and in the apical 2/10 of tibial length. Pterostigma brownish.

Remark: The species is misplaced in the key for pectoralis -group ( SCHWENKE, 1999: 95–98) because the ovipositor sheath is about as long as the hind metatarsus. It runs to no. 68 ( Mesochorus bracatus SCHWENKE ) but differs from M. bracatus by its pale hind coxa and pale hind femur.

Figures

Fig. 23a-d: Holotype of Mesochorus solus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.