Mesochorus oppacheus 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 : 11-12

19. Mesochorus oppacheus SCHWENKE, 1999

( Figs 18a–d )

Holotype: "() Oppach 1,3 O 15.8 .1993 304/93 H. Zoerner " [, no. 304/93, Germany: Saxony, 1.3 km E of Oppach, 15.8.1993, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Left flagellum, right antenna completely. Body length 5.1 mm. Temple very short, strongly narrowed behind eye, 0.25x as long as the eye width. Ocelli very large, OOD 0.35. Face with fine, moderately dense punctures, 0.92x as wide as the length of face+clypeus, and 0.66x as wide as the length of the eye, sides slightly convergent ventrally. Clypeus with scattered punctures. Ventral 0.2 of facial orbit, mandibular base and malar space striate. MI 0.15. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with coarse dense punctures caudal-medially, with strongly smoothened structure laterally. Mesopleuron with fine punctures dorsally, almost smooth ventrally; metapleuron with fine scattered punctures. Area basalis triangular, as long as wide, stalked apically; area superomedia 2.3x longer than wide and 2.0x longer than the area petiolaris, costula in frontal 3/10 of length of area superomedia; area petiolaris 0.9x as long as wide. Hind femur 4.5x longer than wide; hind metatarsus 0.46x as long as the hind tibia; hind claws with ca. 4 small basal teeth. Areolet shortly sessile, 2 nd recurrent vein slightly proximal to its middle; nervulus interstitial; pterostigma narrow, 3.4x longer than wide, radial vein in its distal 0.7. 1 st tergite 2.3x longer than wide; postpetiolus 1.2x longer than wide, smooth; 2 nd tergite 1.1x longer than wide; thyridium transversaloval. Ovipositor sheath 5.9x longer than wide and 0.85x as long as the hind metatarsus, narrowed in the apical 3/10 of tibial length.

Colour: Reddish-brown. Head blackish; palps, mandible except teeth, malar space, clypeus and narrow facial orbit cream-yellow. Mesosoma reddish; propleuron brownish; hind edge of pronotum, tegula and wing base creamyellow. 1 st and 2 nd tergites dark reddish-brown, 3 rd tergite reddish-brown basally, blackish apically; following tergites blackish. Legs reddish; hind tibia pale yellow, brown in the apical 2/10 of tibial length (2.5x of tibial width). Pterostigma hyaline-ochreous.

Remark: This species is correctly placed in the key for the angustatus -group ( SCHWENKE, 1999: 72–73), although the pterostigma is not clearly hyaline, but has an ochreous tint.

Figures

Fig. 18a-d: Holotype of Mesochorus oppacheus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.