Mesochorus ovimaculatus 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 : 12

20. Mesochorus ovimaculatus SCHWENKE, 1999

( Figs 19a–d )

Holotype: "() Dessau-Anh. 108/88 23.8. leg. Zoerner " [, no. 108/88, Germany: Saxony-Anhalt, district Dessau of town Dessau-Rosslau , 23.8.1988, leg. K.H. Zoerner] ( SDEI).

Description: Complete. Body length 3.5 mm. Flagellum with 30 flagellomeres, preapical flagellomeres ca. 1.5x longer than wide; 1 st flagellomere 6.4x longer than wide and 0.6x as long as the eye; 2 nd flagellomere 3.4x longer than wide. Temple slightly and roundly narrowed behind eye, 0.65x as long as the eye width. OOD 1.45. Face coarsely punctate, with parallel sides, 1.05x wider than the length of clypeus+face and 0.9x as wide as the length of the eye, coarsely punctate. MI 0.5. Clypeus with scattered punctures. Ventral 0.4 of facial orbit and malar space striate. Upper mandibular teeth slightly larger than the lower ones. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with moderately dense punctures apicomedially, superficially punctate laterally; mesopleuron with dense coarse punctures dorsally and very scattered fine hair-punctures ventrally; metapleuron more or less smooth. Area basalis trapezoid, slightly longer than wide; area superomedia 1.8x longer than wide and 1.3x 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 4.1x longer than wide; hind metatarsus 0.45x as long as the hind tibia; hind claws with about three short teeth. Areolet pointed, slightly oblique, 2 nd recurrent vein in its middle; nervulus interstitial; pterostigma 3.1x longer than wide, radial vein in its distal 0.7. 1 st tergite 2.75x longer than wide; postpetiolus 1.25x longer than wide, smooth; 2 nd tergite 0.95x as long as wide; thyridium roundish. Ovipositor sheath pilose, 5.4x longer than wide and as long as the hind metatarsus, slightly narrowed in the apical 4/10 of tibial length.

Colour: Flagellum yellowish, darkened in distal half. Face dark brownish. Clypeus and narrow orbits reddish; mandible except teeth, malar space and gena yellow. Mesosoma black; hind edge of pronotum, tegula and wing base yellow. Metasoma black; 2 nd tergite with yellow-red band in the apical 2/10 of tibial length; 3 rd tergite yellow-red, with brownish sides and yellowish-grey apical band; following tergites brown basally and yellow-grey apically. Legs reddish-yellow; hind femur with brownish suffusion; hind tibia yellow, brown basally and in the apical 1.5/10 of tibial length (1x of tibial width). Pterostigma hyaline-ochreous.

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

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

Figures

Fig. 19a-d: Holotype of Mesochorus ovimaculatus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.