Mesochorus agnellonis, Schwenke, 1999

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 : 690-691

Mesochorus agnellonis SCHWENKE, 1999: 70 ( figs 1-4 )

Holotypus: (♀) Italia Piemonte Pontechianale CN Colle Agnello m 2050, 2.VIII.1986 Scaramozzino (ZSM), type studied.

Description: ♀: Bodylength 4.5-5.5 mm. Flagellawith 35-37 segments; 1 st flagellomeres length 7.5x width and 0.64x eye length, 2 nd flagellomeres length 5.0x width, preapical flagellomeres c.2x longer than wide. Temples strongly narrowed behind eyes, length 0.5x eye width. Ocelli very large, OOD 0.5-0.7. Face with parallel sides,

width 1.0x length of clypeus+face and 0.8x eye length, punctate. Frons almost smooth. MI 0.3. Mandibles with equal teeth. Malar spaces, ventral 0.3 of facial orbits and mandibular bases finely striate. Occipital carina complete medially. Genal carinae reach the hypostomal ones close to mandibular bases (distance c.0.3x length of malar spaces). Pronotum with very superficial punctures, almost smooth; mesoscutum with fine and moderately dense punctures apico-medially and fine superficial punctures laterally; mesopleura with fine dense punctures dorsally and with coarse scattered punctures ventrally; metapleura with moderately dense superficial punctures. Area basalis slender, triangular to trapezoid, length c.2x width; area superomedia length 2.4x width and 1.3- 1.5x length of area petiolaris, costulae in frontal 0.3-0.35; area petiolaris length 1.1x width. femora length 4.9-5.6x height; hind metatarsi short, length 0.41x length of hind tibiae; hind claws short, with short basal teeth; distal fore tarsomeres slightly swollen, length 2.7x width. Areolets pointed, oblique, 2 nd recurrent veins proximal to their middle; nervuli interstitial; postnervuli intercepted in basal 0.2-0.3; pterostigma length 3.6x width, radial veins in distal 0.65. 1 st tergite length 3.0x width; postpetiolus length 1.4x width, smooth; 2 nd tergite length 0.95x width; thyridia large, roundish. Ovipositor sheaths length 5.8-6.3x height and 0.8-0.9x length of hind metatarsi.

Colour: Reddish. Ocellar space and frons usually brownish to blackish medially. Flagella more or less infuscate apically. Mesoscutum with three more or less distinct reddishbrown longitudinal stripes. Pterostigmata hyaline-ochreous, margins slightly darker.

♂: Flagella with 35-39 segments. OOD 0.9. Mesopleura with rather dense or scattered punctures. Areae basalis and superomedia sometimes confluent. Legs slender; hind femora length 5.9-6.1x width. Claws without distinct teeth. Clasper stab-shaped, slightly clubbed apically, length 1.0-1.2x length of 2 nd hind tarsomeres.

Hosts unknown.

Distribution: Austria*, Czech Republic (Moravia)*, Italy, Kirgizstan*, Russia (FarEast)*.

Figures

Figs 1-4: Mesochorus agnellonis SCHWENKE ♀ (holotypus): (1) face, (2) propodeum, (3) distal fore tarsomere, (4) ovipositor sheaths.