Mesochorus ( Stictopisthus ) unicinctor (THUNBERG , 1824)

Mesochorus ( Stictopisthus) unicinctor (THUNBERG, 1824) (fig. 15, 52, 72, 85)

O r i g i n a l: Cryptus ( Mesochorus) unicinctor THUNBERG, 1824: 315 , ³.

Lectotype: (³) “ Uppsala Univ. Zool. Mus. Thunbergsaml. nr. 25273 Ichneumon unicinctor Sv. Typ ” ( Uppsala), designated by Horstmann , 2004, type not examined.

syn. Cryptus ( Mesochorus) complanatus HALIDAY, 1838: 114 , ♀.

Lectotype: ( ♀) “3450” (Dublin), synonymized by SCHWENKE (1999: 31), type not examined.

syn. Mesochorus aciculatus BRIDGMAN, 1881: 162 , ♀.

Type lost ( FITTON 1976), synonymized by SCHWENKE (1999: 31).

syn. Mesochorus laticeps THOMSON, 1886: 344 , ♀.

Lectotype: ( ♀) “Bök 8/84” (Lund), synonymized by SCHWENKE (1999: 31), type not examined.

D e s c r i p t i o n: ♀. Body length 3.0- 3.9 mm. Flagellum with 23-28 segments; 1 st flagellar segment 3.1-3.7× as long as wide and 0.45-0.50× as long as eye; 2 nd segment 2.2-2.6× and preapical flagellomere 1.8× as long as wide. Head wide, 2.2× as wide as long. Temple parallel or slightly widened behind eye, moderately narrowed apically, dorsally 0.8× as long as eye. OED 1.9-2.3× and OOD 1.0× ocellar diameter. Occipital carina complete medially. Frons punctate medially, almost smooth laterally. Face punctate centrally, with some transverse irregular striae laterally, its width 1.4-1.5× combined length of clypeus and face and 1.2-1.3× eye length. Dorsal mandibular tooth often larger than ventral tooth. Clypeus slightly impressed, coarsely punctate. MI 0.6.

Mesosoma strongly depressed, 2.5-2.9× as long as high. Mesoscutum with moderately dense punctures (intervals as long as their diameter), with finer sparse punctures laterally. Mesopleuron with rather dense to dense punctures ventrally; punctures of metapleuron finer and denser. Scuto-scutellar groove slit-shaped, smooth. Propodeum completely carinate, but area basalis and area superomedia confluent. Area superomedia c. 2× as long as wide; costula reaching at its middle. Area petiolaris hexagonal, as long as or slightly as long as wide. Fore tibia swollen, 2.2-2.3× as long as wide. Hind femur stout, 2.8-3.0× as long as wide. Inner apical spur of hind tibia 0.63× as long as hind metatarsus. Hind claws without visible teeth. Areolet sessile frontally; vein 2m-cu reaching its middle. Vein 1cu-a strongly postfurcal by 0.7-1.0× its length; distal part of metacarpus about as long as width of pterostigma. Hind wing with 4-5 distal hamuli. Nervellus of hind wing vertical or slightly inclivous.

1 st tergite 2.2-2.4× as long as wide; postpetiole aciculate. 2 nd tergite 0.9× as long as wide. Thyridium comma-shaped, transverse. Ovipositor sheath 4.2-5.7× as long as wide and 0.9-1.2× as long as hind metatarsus, not distinctly narrowed and slightly bent upwards apically.

Color: black. Palps, mandible and tegula yellow. Flagellum brownish, basal flagellomeres yellowish. Face yellowish or reddish-yellow; frons and wide orbits reddish-yellow; stemmaticum and occiput brown or black. Mesosoma black; mesoscutum sometimes with dark reddish H-shaped central spot; pronotum, mesopleuron and metapleuron in Eastern Palaearctic specimens ± reddish. 1 st tergite black; 2 nd tergite with yellow band in apical 0.3-0.4; 3 rd tergite yellow baso-medially, brown laterally and apically; following tergites brownish. Legs yellowish; mid coxa reddish, sometimes brownish; hind coxa often brown dorsally or ± black, hind femur sometimes with brownish suffusion, hind tibia usually narrowly brown apically (0.5× tibial width). Pterostigma hyaline or yellowish.

³. Body length 4.0 mm. Flagellum with 23-28 segments; 1 st flagellar segment 5.6× as long as wide and 0.57-0.62× as long as eye; 2 nd segment 4.2× and preapical segment 2.0× as long as wide. Temple moderately and roundly narrowed behind eye. OED 1.5× ocellar diameter. Frons and occiput with sparse punctures. Face densely punctate, its width 1.3× combined length of face and clypeus and 1.1× eye length, sides convergent ventrally. Mandible with two equally sized teeth, sometimes dorsal tooth slightly larger. MI 0.5.

Mesosoma moderately depressed, 1.9-2.0× as long as high. Mesoscutum and mesopleuron with coarse rather dense punctures, shining; pronotum smooth. Propodeum completely carinate, but area basalis and area superomedia confluent. Area superomedia c. 2× as long as wide; costula reaching at its middle. Area petiolaris large, hexagonal, as long as or slightly as long as wide. Hind femur 3.5-3.9× as long as wide. Wing venation as in ♀.

1 st tergite 2.2-2.5× as long as wide; petiole and postpetiole coarsely aciculate, striae almost appearing as dorso-lateral carinae. 2 nd tergite 0.8-1.0× as long as wide. Thyridium large, transverse, on base of tergite. Stylet pointed apically, 1.6-1.7× as long as 2 nd hind tarsomere.

Color: face yellow; orbits cream-yellow; head otherwise yellowish-red. Mesosoma yellow; mesoscutum with brownish spots laterally and frontal-medially. Propodeum brown, apical 1/3 yellowish. 1 st tergite black, 1 st sternite sometimes rufous basally; 2 nd tergite brown, with yellow band in the apical 0.3-0.4; 3 rd tergite yellow, with apical brownish band; following tergites yellowish-brown and slightly vespoid. Legs yellow, hind tibia and hind tarsomeres slightly fuscous apically. Pterostigma hyaline.

H o s t s: Catoptilia falconipennella (ÜBERNER, 1813) (Lep., Gracillariidae ) (EDI), Pholesetor sp. (Hym. Braconidae ) in Catoptilia rufipennella (ÜBERNER, 1813) (Lep., Gracillariidae ) (EDI), Microgastrinae (Hym. Braconidae ) in Ancylis upupana (TREITSCHKE, 1835) (Lep., Torticidae) (ZSM).

R e m a r k s: The specimen reared from Ancylis upupana in the ZSM determined as “ macrocephalus ” and mentioned under this species in SCHWENKE (1999: 29) belongs to M. unicinctor .

D i s t r i b u t i o n: Transpalaearctic; examined material from Austria, Azerbaijan *, Belgium, Byelorussia *, Germany, Russia ( Murmansk region, Karelia, Tuva region, Far East Russia), Slovakia *, Sweden, and United Kingdom.