Mesochorus albifacies 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 : 2-3

1. Mesochorus albifacies SCHWENKE, 1999

( Figs 1a–d )

Holotype: "() Eisenberg Thü 19.8. 196/88 Zoerner" [, no. 196/88, Germany: Thuringia, Eisenberg , 19.8.1988, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Right flagellomeres from 25th on. Body length 4.8 mm. Left flagellum with 35 flagellomeres; 1 st flagellomere 6.0x longer than wide and 0.8x the length of eye; 2 nd flagellomere 4.0x longer than wide; preapical flagellomeres ca. 2x longer than wide. Temple roundly narrowed behind eye, 0.6x as long as the eye width. OOD 1.05. Face 1.1x wider that the length of clypeus+face and as wide as the eye length, with parallel sides. Malar space and ventral 0.2 of facial orbit narrowly striate. MI 0.4. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesoscutum with fine dense punctures; mesopleuron with fine dense punctures dorsally and moderately dense and fine punctures ventrally; metapleuron with superficial punctures. Area basalis trapezoid, longer than wide; area superomedia ca. 2.0x longer than wide and 1.2x longer than area petiolaris, costula in frontal 4/10 of length of area superomedia; area petiolaris 1.1x longer than wide. Hind femur 5.2x longer than wide; hind metatarsus 0.46x as long as hind tibia; hind tarsal claws without visible teeth. Areolet widely sessile, 2 nd recurrent vein slightly proximal to its middle; nervulus interstitial; pterostigma ca. 4.0x longer than wide, radial vein in its distal 0.6. 1 st tergite 3.1x longer than wide; postpetiolus 1.5x longer than wide, smooth; 2 nd tergite 1.35x longer than wide, thyridium transversal-oval. Stylet stabshaped, clubbed apically, 1.4x longer than the 2 nd hind tarsomere.

Colour: Flagellum blackish, basal flagellomeres yellowbrown. Head brown; face, clypeus, mandible except teeth, malar space and gena cream-yellow; orbits otherwise reddish. Mesosoma black; hind edge of pronotum, tegula and wing base cream-yellow; sides of pronotum and ventral 2/3 of mesopleuron reddish, dorsal 1/3 of mesopleuron brownish; metapleuron brownish; mesoscutum with reddish-brown central spot. Metasoma black; 2 nd tergite with narrow yellow hind margin. Legs reddish-yellow; fore and middle coxae and all trochanters cream-yellow; hind tibia cream-yellow, brownish basally and in the apical 2/10 of tibial length (2x of tibial width); hind tarsus brown. Pterostigma brownish.

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

angustatus- group ( SCHWENKE, 1999: 72–73).

Figures

Fig. 1a-d: Holotype of Mesochorus albifacies SCHWENKE:a. face; b. mesosoma; c. metasoma; d. stylet.