Mesochorus martinus 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 : 10

16. Mesochorus martinus SCHWENKE, 1999

( Figs 15a–d )

Holotype: "() Lu-Wittenberg 7.1964 Lichtfalle H. Zoerner " [, without no., Germany: Saxony-Anhalt, Lutherstadt Wittenberg, light trap, 7.1964, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Left antenna. Body length 5.1 mm. Flagellum with 33 flagellomeres; 1 st flagellomere 6.6x longer than wide and 0.67x as long as the eye; 2 nd flagellomere 3.8x longer than wide; preapical flagellomeres ca. 2.0x longer than wide. Temple strongly narrowed behind eyes, 0.45x as long as the eye width. OOD 1.3. Face coarsely punctate, about as wide as the length of face+clypeus and 0.9x as wide as the eye length, sides convergent ventrally. Clypeus with scattered punctures. Ventral 0.4 of facial orbits mandibular base and malar space widely striate. MI 0.5. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with moderately dense punctures apico-medially and scattered punctures laterally. Mesopleuron with fine dense punctures dorsally and scattered small hair-punctures ventrally; metapleuron with very fine scattered punctures. Area basalis rectangular, slightly longer than wide; area superomedia 1.9x 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 stout, 4.0x longer than wide; hind metatarsus 0.45x as long as the hind tibia; hind claws with three long and widely spaced teeth. Areolet shortly sessile, 2 nd recurrent vein slightly proximal to its middle; nervulus interstitial; pterostigma 3.2x longer than wide, radial vein in its distal 0.65. 1 st tergite 2.4x longer than wide; postpetiolus 1.2x longer than wide, smooth; 2 nd tergite 0.8x as long as wide; thyridium transversal-oval. Ovipositor sheath pilose, ca. 6.8x longer than wide and 0.95x as long as the hind metatarsus, slightly narrowed in the apical 4/10 of tibial length.

Colour: Black. Face reddish; wide facial orbit, mandible except teeth and malar space yellow; gena and orbits widely reddish. Mesosoma blackish; pronotum reddish; hind edge of pronotum, tegula and wing base yellowish; mesopleuron brownish, reddish fronto-dorsally. 1 stte rgite narrowly dark reddish basally; 2 nd tergite yellow in the apical 2/10 of tibial length; 3 rd tergite yellowish, sides brownish; following tergites brownish, reddish-brown centrally and apically. Legs yellowish, hind tibia brown in apical 2/10 of tibial length. Pterostigma brownish.

Remark: This taxon is difficult to identify in the key for the pectoralis -group ( SCHWENKE, 1999: 95–98) since the mesopleuron is not completely black. In this key, it runs to no. 60 ( Mesochorus venerandus SCHWENKE ), but differs from M. venerandus by shorter temples and a different coloration of the mesosoma.

Figures

Fig. 15a-d: Holotype of Mesochorus martinus SCHWENKE: a. face; b. mesosoma; c. metasoma; d. ovipositor sheath.