Mesochorus ( Stictopisthus ) formosus BRIDGMAN , 1882

Mesochorus ( Stictopisthus) formosus BRIDGMAN, 1882 (figs 5, 20, 42, 59, 76)

O r i g i n a l: Mesochorus formosus BRIDGMAN, 1882: 154 , ♀.

Lectotype: ( ♀) [ Great Britain] ( Norwich ), type not examined.

syn. Mesochorus convexicollis THOMSON, 1886: 344 , ♀ ³.

Lectotype: ( ♀) “Hbg., convexicollis” ( LUND), synonymized by MEYER (1935), type not examined. syn. Mesochorus turbidus SCHWENKE, 1999: 39 , synonymized by RIEDEL (2019).

H o l o t y p e: ( ♀) “I, BZ, Villanders 1000 m, 21.9.1978, E. Haeselbarth” (ZSM), type examined. syn. nov. Stictopisthus polonius SCHWENKE, 1999: 32 , ³.

H o l o t y p e: (³) “399” ( ZSM), type examined. D e s c r i p t i o n: ♀. Body length 2.0-3.0 mm. Flagellum with 20-24 segments ; 1st

flagellar segment 6.5-7.0× as long as wide and 0.62-0.65× as long as eye; 2 nd segment 4.5-5.0× and preapical segment 1.7-2.0× as long as wide. Temple parallel or slightly widened behind eye, moderately narrowed apically, dorsally 0.8× as long as eye. OED 1.8× ocellar diameter. Occipital carina sometimes weak medially. Face coarsely punctate, its width 1.1-1.2× combined length of face and clypeus and 1.0-1.1× eye length, sides parallel. Malar space and ventral 0.3 of facial orbit finely striate. Dorsal mandibular tooth often slightly larger than ventral tooth. MI 0.3-0.4.

Mesosoma moderately depressed, 1.8-2.0× as long as wide. Mesoscutum densely punctate. Mesopleuron with sparse punctures or almost smooth ventrally. Scuto-scutellar groove smooth. Propodeum completely carinate, but area basalis and area superomedia confluent. Area superomedia 2× as long as wide; costula carina reaching at its middle. Area petiolaris hexagonal, as long as wide. Hind femur 3.5-3.6× as long as wide. Areolet pointed frontally; vein 2m-cu reaching at its middle. Vein 1cu-a moderately postfurcal by 0.4-0.6× its length. Pterostigma c. 3.3× as long as wide. Apical part of metacarpus long, about as long as width of pterostigma. Hind wing with 4 distal hamuli; nervellus vertical. 1 st tergite 2.8-3.1× as long as wide; postpetiole aciculate. 2 nd tergite 0.9-1.0× as long as wide. Thyridium comma-shaped. Ovipositor sheath 5.5-6.6× as long as wide and 0.8- 0.9× as long as hind metatarsus, not distinctly narrowed apically, slightly bent upwards.

Color: black. Palps and tegula yellow. Flagellum yellowish proximally, ± infuscate distally. Face brownish; stemmaticum and occiput black. Mandible, gena, clypeus apically and orbits ± yellowish-red. Mesosoma black; mesoscutum sometimes with H-shaped dark reddish mark. Metasoma black; 1 st sternite sometimes with reddish base; 2 nd tergite with yellow band or arched spot in apical 0.25; 3 rd tergite yellow in the basal part (length 0.5 centrally and 0.25 laterally). Legs yellow; hind coxa brown to blackish; hind femur with some brownish suffusion; hind tibia with narrow brown apex (0.5-1.0× tibial width). Pterostigma hyaline, with fuscous margins.

³. Body length 3.0 mm. Flagellum with 22-23 segments; 1 st flagellar segment 7.8-8.0× as long as wide and 0.65-0.75× as long as eye; 2 nd segment 5.4× as long as wide. Temple slightly to moderately narrowed behind eye, dorsally 0.7-0.78× as long as eye. OED 1.4- 1.6× and OOD 0.9× ocellar diameter. Face coarsely punctate, its width 1.0× combined length of face and 1.0× eye length, sides parallel. Mandible with two equal teeth. MI 0.4.

Mesosoma moderately depressed, 1.8-2.0× as long as high. Mesoscutum rather densely punctate medially, with sparse punctures laterally. Mesopleuron with sparse to rather dense punctures ventrally. Propodeum carinate as in ♀. Hind femur 4.0-4.4× as long as wide. Inner apical spur of hind tibia 0.55× as long as hind metatarsus. Hind claws without visible teeth. 1 st tergite 2.5-3.1× as long as wide; postpetiole with longitudinal striation. 2 nd tergite 1.0-1.1× as long as wide. Thyridium comma-shaped. Stylet 1.2-1.4× as long as 2 nd hind tarsomere, slightly clubbed apically.

Color: Head yellowish; stemmaticum brown. Scape, pedicel and basal flagellomeres yellow, flagellum infuscate in distal 3/4. Mesosoma yellowish or reddish; mesoscutum with two lateral and one fronto-median brown to blackish stripes, sometimes completely reddish-yellow; scutellum brown, sometimes reddish-yellow; propodeum blackish or brown. Metasoma blackish; 1 st tergite reddish basally; 2 nd tergite with a transversal band or triangular yellow spot in apical 0.2-0.3; 3 rd tergite yellow in basal 0.5; following tergites brown or slightly vespoid. Legs yellowish; hind tibia infuscate in apical 0.1-0.2. Pterostigma hyaline.

H o s t s: Apanteles s. lat. (Hym., Braconidae ) in Phyllonoryctes blancardella (FABRICIUS, 1781) (Lep., Gracillariidae ) (ZSM), Pholetesor circumscriptus (NEES) in Phyllonorycter lantanella (EDI) , Pholetesor nanus (REINHARD) in Phyllonorycter strigulatella (EDI) ,? Pholetesor nanus (REINHARD) in Phyllonorycter anderidae (EDI) , Pholetesor nanus (REINHARD) in Phyllonorycter spinolella (EDI) , Pholetesor nanus (REINHARD) in Phyllonorycter hilarella (EDI) , Pholetesor nanus (REINHARD) in Phyllonorycter dubitella (EDI) , Phyllonorycter salicolella (EDI), Pholetesor sp. in Catoptilia rufipennella (ÜBERNER, 1813) (Lep., Gracillariidae ) (EDI), Pholetesor laetus (MARSHALL) in Caloptilia semifascia (EDI) , Pholetesor nanus (REINHARD) in Salicidella aspinolella (EDI), [primary host] Bucculatrix thoracella (THUNBERG, 1794) (Lep., Bucculatricidae ) (ZSM)

D i s t r i b u t i o n: West Palaearctic; examined material from Czech Republic, Germany, Poland, Sweden, and United Kingdom.