Mesochorus canalis 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 : 3-4

3. Mesochorus canalis SCHWENKE, 1999

( Figs 3a–d )

Holotype: "() Oppach 1.3. ONO 8.6.1993 165/93 H. Zoerner " [, no. 165/93, Germany: Saxony, 1.3 km ENE of Oppach, 8.6.1993, leg. K.H. Zoerner] ( SDEI).

Description: Missing: Left flagellum, right antenna, right fore wings, ovipositor sheaths artificially folded centrally. Body length 3.8 mm. Temple moderately but linearly narrowed behind eye, 0.6x as long as the eye width. OOD 1.3. Face very wide, punctate, with centrally smoothened structure, 1.05x wider than the length of clypeus+face and about as wide as the eye length, with parallel sides. Facial orbit and malar space striate. MI 0.35. Mandible with two equal teeth. Genal carina reaching the hypostomal carina far from mandibular base. Mesopleuron with moderately dense punctures dorsally and scattered to moderately dense punctures ventrally; metapleuron with fine punctures. Area basalis narrowly triangular, ca. 2x longer than wide, with long stalk apically; area superomedia 1.45x longer than wide and 1.3x longer than the area petiolaris, costula in frontal 3.5/10 of length of area superomedia; area petiolaris 0.85x as long as wide. Hind femur 4.4x longer than wide; hind metatarsus 0.45x as long as hind tibia; hind claws with ca. 4 small basal teeth. Areolet oblique, pointed, 2 nd recurrent vein distinctly proximal to its middle; nervulus interstitial; postnervulus intercepted widely basal to its middle; pterostigma 3.2x longer than wide, radial vein in its distal 0.6. 1 st tergite short, 1.9x longer than wide; postpetiolus almost square, with a long and wide central (artificial?) impression; 2 nd tergite 0.85x as long as wide, with short basal impression; thyridium roundish. Ovipositor sheath pilose, artifically folded, almost not narrowed apically, ca. 7.2x longer than wide and ca. 1.1x longer than the hind metatarsus.

Colour: Black. Face blackish; facial orbit, clypeus apically, mandible except teeth, malar space and gena in ventral half yellow. Mesosoma black; hind edge of pronotum, tegula and wing base yellow; mesoscutum with central H-shaped red spot. Metasoma black; 2 nd tergite narrowly reddish-yellow apically. Legs reddish; hind tibia yellowish, slightly darkened basally, subbasally and in apical 2/10 to 3/10 of tibial length. Pterostigma brownish.

Remark: This species belongs to the angustatus -group and is correctly placed in the key for this group ( SCHWENKE, 1999: 72–73). It is characterized by stalked area basalis, the venation of fore wings and structure of 1 st tergite. However, some of these features are probably artificial or results of a teratogenic abnormality.

Figures

Fig. 3a-d: Holotype of Mesochorus canalis SCHWENKE: a. face; b. mesosoma; c. postpetiolus; d. ovipositor sheath.