Mesochorusfulgurans

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 : 694-695

Mesochorusfulgurans CURTIS, 1833: plate 464 ( figs 18-24 )

Holotypus: (♀) withoutoriginallabel (Coll. CURTIS/Melbourne), typenotstudied.

syn. Cryptus (Mesochorus) fulgurans HALIDAY, 1838: 114, preoccupied by CURTIS 1833.

Lectotypus: (♀) fulgurans (Dublin).

syn. Mesochorus pectinipes THOMSON, 1886: 336, preoccupied by BRIDGMAN 1883.

Lectotypus: (♀) Scan (Lund).

syn. Mesochorus fulvus THOMSON, 1886: 336.

Lectotypus: (♀) Pål (Lund), synonymized by HORSTMANN 2006: 1462.

syn. Mesochorus suecicus DALLA TORRE, 1901: 58 (nom. nov. for M. pectinipes THOMSON), synonymized by HORSTMANN 2006: 1462.

syn. nov. Mesochorus minowai UCHIDA, 1929.

Ta xonomica l remar k: Ihad the opportunity to study Japanese material (from Niigata Pref., Sado island) determined as Mesochorus minowai UCHIDA. The specimens belong to M. fulgurans CURTIS. Ihave not seen the type of M. minowai UCHIDA yet, but the pictures of the type material provided by K. KONISHI are also similar to M. fulgurans . I therefore synonymize both species here.

Description: ♀: Bodylength 5.3-7.0 (-10.5) mm. Flagellawith 40-46 segments; 1 st flagellomeres length 6.1x width and 0.6x eye length; 2 nd flagellomeres length 4.1x width; preapical flagellomeres c.2x longer than wide. Temples strongly narrowed behind eyes, length 0.4-0.5x eye width. Ocelli very large, OOD 0.45-0.65. Face width 1.05x length of clypeus+face and 0.8x eye length, with parallel sides. MI 0.2-0.3. Mandibles with two equal teeth. Malar spaces and lower 0.2 of facial orbits striate, sometimes also mandibular bases. Occipital carina complete medially. Genal carinae reach the hypostomal ones far from mandibular bases; hypostomal carinae narrow. Mesoscutum with coarse and dense punctures caudal-medially and with superficial punctures laterally, mesopleura with fine dense punctures dorsally and moderately dense and coarse punctures ventrally; metapleura with fine and moderately dense punctures. Area basalis trapezoid or rectangular, pointed or with short stalk apically; area superomedia length 1.7-2.2x width and 1.75x length of area petiolaris; area petiolaris length 0.8x width. Hind femora length 5.0x height; hind metatarsi length 0.49x length of hind tibiae; hind claws completely pectinate, with strong and long teeth; distal fore tarsomeres moderately swollen, length c.2.3-2.5x width. Areolets pointed-sessile, oblique; 2 nd recurrent veins usually in or proximal to their middle; nervuli interstitial, sometimes slightly antefurcal; pterostigma length 3.5x width. 1 st tergite length 2.8-3.0x width; postpetiole length 1.3- 1.4x width, smooth; 2 nd tergite length 1.3x width; thyridia large, transversal-oval. Ovipositor sheaths length 5.5-6.8x width and 0.65-0.77x length of hind metatarsus.

Colour: Reddish including ocellar space and ovipositor sheaths. Palps, mandibles except teeth, often inner orbits, genae, tegulae, wing bases, fore coxae and trochanters yellowish. Sometimes median lobe of mesoscutum slightly brownish frontally. Pterostigmata pale yellowish-brown, margins slightly darker.

♂: Flagellawith 41 segments. Temples strongly narrowed behind eyes, length c.0.5x eye width. Hind femora length 5.7 height. 2 nd tergite length 1.2x width. Hind claws without visible teeth. Claspers slender, apically blunt, not thickened, length 16x width, length c.1.1-1.2x length of 2 nd hind tarsomeres. Colour as described for the ♀.

Hosts: Abraxas grossulariata (LINNAEUS, 1758) (Lep. Geometridae ) via Hyposoter tricolor (RATZEBURG, 1844) (Hym. Ichneumonidae ).

Distribution: Armenia*, Austria, Czech Republic, Germany, Italy, Japan, Kirgizstan*, Liechtenstein*, Russia including Far East, Sweden, Ukraine.

Figures

Figs 18-24: Mesochorus fulgurans CURTIS ♀: (18) face, (19) propodeum, (20) distal fore tarsomere, (21) mesopleuron, (22) head, (23) hind claw, (24) ovipositor sheaths.