Mesochorus sordidus 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 : 14-15

25. Mesochorus sordidus SCHWENKE, 1999

( Figs 24a–d )

Holotype: "() Oppach 1,2 km O 10.6 .1993 174/93

H. Zoerner" [, no. 174/93, Germany: Saxony, 1.2 km E

of Oppach, 10.6.1993, leg. K.H. Zoerner] ( SDEI) .

Description: Missing: Left antenna completely, right flagellomeres from 3 rd on. Body length 3.3 mm. 1 st flagellomere 7.3x longer than wide and 0.71x as long as the eye; 2 nd flagellomere 4.4x longer than wide. Temple moderately narrowed behind eye, 0.55x as long as the eye width. OOD 1.0. Face coarsely punctate, 1.1x wider than the length of clypeus+face and 0.87x as wide as the eye length, with parallel sides. MI 0.35. Clypeus with scattered punctures. Malar space striate. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with coarse dense punctures apico-medially and with scattered punctures laterally; mesopleuron with dense fine punctures dorsally and moderately dense but superficial punctures ventrally. Area basalis triangular, slightly longer than wide, shortly stalked apically; area superomedia 1.7x longer than wide and 1.3x longer than the area petiolaris, costula in frontal 4/10 of length of area superomedia; area petiolaris 0.87x as long as wide. Hind femur 5.2x longer than wide; hind metatarsus 0.47x as long as the hind tibia. Hind claws without visible teeth. Areolet shortly sessile, 2 nd recurrent vein slightly prox- imal to its middle; nervulus slightly postfurcal (by 1x its width); pterostigma 2.9x longer than wide, radial vein in its distal 0.68. 1 st tergite 2.9x longer than wide; postpetiolus 1.4x longer than wide, smooth; 2 nd tergite 1.05x longer than wide; thyridium roundish. Stylet long, stab-shaped, slightly clubbed apically, 1.4x longer than the 2 nd hind tarsomere.

Colour: Black. Basal flagellomeres yellowish. Face pale yellow, partly with reddish-yellow suffusion; wide facial orbit, mandible except teeth, malar space and gena cream-yellow. Frontal orbit opposite to lateral ocelli yellowish. Mesosoma black; pronotum reddish; propleuron, anterior margin and hind edge of pronotum, tegula and wing base cream-yellow; mesopleuron reddish, brownish in dorsal third; metapleuron brownish; mesoscutum with reddish H-shaped central spot. 1 st tergite black; 2 nd tergite with red band in the apical 1.5/10 of tibial length; 3 rd tergite red, brownish centrally; following tergites blackish, with dark-greyish hind margins. Legs reddish; hind tibia yellow, brownish basally and in the apical 2/10 of tibial length; hind tarsus except pale base of metatarsus brownish. Pterostigma brownish, distal edge pale.

Remark: The species is correctly placed in the key for the dispar -group ( SCHWENKE, 1999: 48–51), though the pterostigma is not blackish-brown as stated by SCHWENKE but brownish with paler distal edge.

Figures

Fig. 24a-d: Holotype of Mesochorus sordidus SCHWENKE:a. face; b. mesosoma; c. metasoma; d. stylet.