Mesochorus fulvoides, Riedel, 2018

Riedel, Ravenhorst Matthias, 2018, Contribution to the Palaearctic species of Mesochorus G (Hymenoptera, Ichneumonidae, Mesochorinae): 1. The M. fulvus-group, Linzer biologische Beiträge 50 (1), pp. 687-716 : 695-696

Mesochorus fulvoides nov.sp. ( figs 25-28 )

Holotypus: (♀) Traunstein 13.7.1960; Mesochorusfulgurans Curt. R. Bauer ♀ (Munich).

Ta xonomica l remar k: This species is closely related to M. heterodon HORSTMANN. It differs by its wider face, trapezoid area basalis, longer area petiolaris, and slenderer distal fore tarsomeres.

Description: ♀: Bodylength 7 mm. Flagellawith 44 segments; 1 st flagellomeres slender, length c.8x width and 0.85x eye length; 2 nd flagellomeres length c.5.0x width. Temples moderately narrowed behind eyes, length 0.7x eye width. Ocelli small, OOD 1.5-1.6. Face very wide, sides slightly divergent ventrally, width 1.22x length of clypeus+face length and 1.15x eye length, with coarse punctures. Frons finely granulate and with some scattered punctures. MI 0.6. Lower mandibular teeth distinctly larger than the upper ones. Genae and mandibular bases finely striate. Occipital carina complete medially. Genal carinae reach the hypostomal ones far from mandibular bases. Pronotum punctate, frontal margin smooth; mesoscutum with coarse dense punctures caudalmedially and with fine scattered punctures laterally; mesopleura with moderately dense punctures; metapleura with fine and moderately dense punctures. Area basalis trapezoid, length 1.6x width; area superomedia length 2.2x width, costulae in frontal 0.35; area petiolaris length 1.2x width. Hind femora length 5.8x height; hind claws slender, with 3 short teeth at bases; distal fore tarsomeres slender, length c.3.3 width. Areolets pointed sessile, very oblique; 2 nd recurrent veins in their middle; nervuli interstitial; postnervuli intercepted at basal 0.35. Frontal margins of pterostigmata folded. 1 st tergite length 3.3- 3.4x width; postpetiolus smooth, length 1.8x width; 2 nd tergite length 1.24x width. Ovipositor sheaths rather slender, length 8.3x width and 0.8x length of hind metatarsi.

Colour: Reddish including ocellar space. Palps, clypeus, genae, wide inner orbits, hind edges of pronotum, tegulae and wing bases yellow. Pterostigmata very pale ochreous. Ovipositor sheaths dark brownish.

Males andhosts unknown.

Distribution:Germany.

Figures

Figs 25-28: Mesochorus fulvoides nov.sp. ♀ (holotypus): (25) face; (26) head, (27) hind claw, (28) ovipositor sheaths.