Mesochorus falcatus 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 : 5-6

7. Mesochorus falcatus SCHWENKE, 1999

( Figs 7a–d )

Holotype: "() Dessau 4 km SSW, 7.8.86, K.H. Zoerner; 100/86 Taubeufer" [, no. 100/86, Germany: Saxony- Anhalt , 4 km SSW of the district Dessau of town Dessau-Rosslau, shore of the river Taube, 7.8.1986, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Right flagellomeres from the 19th on, tip of right stylet broken off. Body length 8.2 mm. Flagellum with 40 flagellomeres; 1 st flagellomere 7.5x longer than wide and 0.64x as long as the eye; 2 nd flagellomere 5.0x longer than wide; preapical flagellomeres 2.5–3.0x longer than wide. Temple moderately and roundly narrowed behind eye, 0.56x as long as the eye width. Ocelli large, OOD ca. 0.7. Face coarsely and densely punctate, with parallel sides, about as wide as the length of clypeus+face and 0.86x as wide as eye length. MI 0.25. Mandibular teeth of equal size. Malar space finely striate. Genal carina reaching the hypostomal carina close to mandibular base. Mesoscutum with dense and fine punctures; mesopleuron densely punctate dorsally and with coarse but scattered punctures ventrally; metapleuron with fine scattered punctures. Area basalis almost rectangular, ca. 1.5x longer than wide; area superomedia 1.9x longer than wide and 1.35x longer than the area petiolaris, costula in frontal 3.5/10 of length of area superomedia; area petiolaris 0.95x as long as wide. Hind femur 5.3x longer than wide; hind metatarsus 0.54x as long as the hind tibia; hind claws with two long basal teeth, apices strongly falcate. Areolet slightly sessile, slightly oblique; 2 nd recurrent vein slightly proximal to its middle; nervulus interstitial; subbasal cell of front wing completely bare in basal half. 1 st tergite 2.9x longer than wide; postpetiole 1.4x longer than wide, smooth; 2 nd tergite 1.25x longer than wide; thyridium indistinct. Stylet pointed, ca. 1.25x longer than the 2 nd hind tarsomere.

Colour: Completely reddish. Pterostigma hyaline.

Remark: The taxon is correctly placed in the key of the fulvus -group ( SCHWENKE, 1999). The males can easily be identified by the falcate claws.

Valid name: Mesochorus pelvís SCHWENKE, 2002 syn. Mesochorus falcatus SCHWENKE, 1999 (preoccupied by Mesochorus falcatus DASCH, 1974 ), synonymized by HORSTMANN (2006).

Figures

Fig. 7a-d: Holotype of Mesochorus falcatus SCHWENKE: a. face; b. mesosoma; c. stylet, d. right hind claw.