Mesochorus ( Stictopisthus ) mandibulator, Riedel, 2025

Mesochorus ( Stictopisthus) mandibulator nov.sp. (figs 7, 44, 62)

H o l o t y p e: ( ♀) “ Mongolia, Gobi-It. Aimy 33 km South Begzra, Koslov, 14.7.1970 ” (St. Petersburg).

Paratype: (³) “ Mongolia, G.-Altai, Mt. Khasagt Kharkan, 15 km S Jargalan, Kerzner, 14.8.1970 ” ( St.

Petersburg). D e s c r i p t i o n: ♀. Body length 4 mm. Flagellum with 26 segments; 1st flagellar segment 4.3× as long as wide and 0.57× as long as eye; 2 nd segment 2.9× and preapical flagellomere 2.2× as long as wide. Temple roundly narrowed behind eye, dorsally 0.8× as long as eye. OED 2.2× ocellar diameter. Occipital carina complete. Face with coarse punctures and transverse aciculation, its width 1.5× combined length of face and clypeus and 1.2× eye length, with parallel sides. Clypeus impressed, almost smooth. Mandible strongly swollen in apical half, with two equal teeth. MI 0.5.

Mesosoma strongly depressed, 2.2× as long as high. Side of pronotum smooth; mesoscutum, mesopleuron, and metapleuron rather densely punctate. Scuto-scutellar groove smooth. Hind femur 3.2× as long as wide. Areolet sessile frontally; vein 1cu-a strongly postfurcal by 0.8× its length. Pterostigma 2.5× as long as wide. Distal part of metacarpus short, c. 0.7× as long as width of pterostigma. 1 st tergite 2.3× as long as wide; postpetiole finely aciculate. 2 nd tergite 0.8× as long as wide. Thyridium transverse, comma-shaped. Ovipositor sheath 4.2× as long as wide and 0.6× as long as hind metatarsus, not distinctly narrowed and slightly bent upwards apically.

Color: black. Head reddish; mandible except teeth, facial orbit and gena yellowish. Flagellum reddish, slightly infuscate in distal third. Mesosoma reddish; mesoscutum with two blackish lateral stripes and blackish fronto-medial spot; propodeum blackish, brownish in apical third. 1 st sternite basally reddish; 1 st tergite black, with reddish apical spot; 2 nd tergite red, with basolateral black stripes; 3 rd tergite reddish, brownish in apical half; following tergites brownish, slightly vespoid. Legs reddish-yellow; hind femur more brownish-yellow; hind tibia cream-yellow, narrowly brown at apex (0.5× tibial diameter). Pterostigma yellowish, margins brownish.

³. Body length 3.5 mm. Flagellum with 24 segments; 1 st flagellar segment 5.3× as long as wide and 0.61× as long as eye; 2 nd segment 3.9× and preapical segment 2.5× as long as wide. Temple roundly narrowed behind eye, dorsally 0.8× as long as eye. OED 1.4× ocellar diameter. Occipital carina complete. Face with coarse and irregular transverse aciculation, its width 1.2× combined length of face and clypeus and 1.1× eye length, with parallel sides. Clypeus slightly impressed, almost smooth. Mandible slightly swollen in apical half, with two equal teeth. MI 0.5.

Mesosoma moderately depressed, 2.0× as long as high. Side of pronotum smooth. Mesoscutum, mesopleuron, and metapleuron rather densely punctate. Scuto-scutellar groove smooth. Areolet sessile frontally; vein 1cu-a strongly postfurcal by 0.8× its length, distal part of metacarpus c 0.7× as long as width of pterostigma.

1 st tergite 2.1× as long as wide; postpetiole almost smooth, with central rim. 2 nd tergite 0.8× as long as wide. Thyridium comma-shaped. Stylet stick-shaped, slightly clubbed apically, 1.2× as long as 2 nd hind tarsomere.

Color: Head reddish; mandible except teeth, facial orbit and gena yellowish. Flagellum reddish, slightly infuscate in distal third. Mesosoma reddish; mesoscutum with two blackish lateral stripes and blackish fronto-median spot; propodeum blackish, in apical third brownish. 1 st sternite with reddish base. 1 st tergite black, with reddish apical spot; 2 nd tergite red, with basolateral black spots; 3 rd tergite reddish, more brownish in the apical half; following tergites brownish, slightly vespoid. Legs reddish-yellow; hind femur more brownish-yellow; hind tibia cream-yellow, narrowly brown at apex (1.0× tibial diameter); hind metatarsus cream-yellow, apically brown; following hind tarsomeres brownish. Pterostigma yellowish, margins brownish.

R e m a r k s: This species is closely related to Mesochorus macrocephalus STROBL and probably represents a subspecies of the latter. It differs by longer basal flagellar segments, wider malar space and a slightly different color pattern.

D i s t r i b u t i o n: Only known from Mongolia.

Mesochorus ( Stictopisthus) maroccanus ( SCHWENKE, 1999) , new ♁ (figs 8, 22, 27, 35, 45, 77, 88)

O r i g i n a l: Stictopisthus maroccanus SCHWENKE, 1999: 29 View in CoL , ♀.

H o l o t y p e: ( ♀) “ Maroc, Dariet Aoua, 20.7.58” ( American Entomological Institute ), type not examined. D e s c r i p t i o n: ♀. Body length 2.9-3.3 mm. Flagellum with 20-23 segments ; 1st

flagellar segment 3.5-3.8× as long as wide and 0.43-0.45× as long as eye; 2 nd segment 2.7-2.8× and preapical segment 1.7× as long as wide. Temple moderately to strongly and roundly narrowed behind eye, dorsally 0.6-0.8× as long as eye. OED 1.4-1.8× and OOD 1.4× ocellar diameter. Occipital carina complete medially. Frons finely granulated laterally. Face with coarse but superficial punctures, its width 1.0× eye length and 1.2× combined length of clypeus and face. Mandible with two equal teeth. MI 0.5-0.7.

Mesosoma slightly or moderately depressed, 1.8-2.0× as long as high. Mesopleuron coarsely and rather densely punctate; metapleuron with finer and denser punctures. Scuto-scutellar groove slit-shaped, smooth. Area basalis and area superomedia confluent; costula reaching at its middle. Area petiolaris 0.9× as long as wide. Hind femur 3.1-3.3× as long as wide. Inner apical spur of hind tibia 0.65× as long as hind metatarsus. Hind claws without visible teeth. Areolet oblique, slightly sessile frontally; vein 2mc-u reaching at its middle; vein 1cu-a strongly postfurcal by 0.6× its length. Postnervulus intercepted in its middle. Pterostigma 2.9× as long as wide; distal part of metacarpus short, 0.1-0.5× of pterostigma width. Hind wing with 4 distal hamuli; nervellus slightly inclivous.

1 st tergite 2.0× as long as wide; postpetiole aciculate. 2 nd tergite 0.7× as long as wide. Ovipositor sheath 5.5-6.5× as long as wide and 0.8-0.9× as long as hind metatarsus, sometimes slightly narrowed and bent upwards apically.

Color: Black. Face, clypeus, gena, frontal orbit and vertex yellow; frons medially and temple reddish, outer orbit sometimes red; occiput brown, sometimes also stemmaticum. Pronotum, mesopleuron and metapleuron centrally reddish; mesoscutum with four lateral and submedian yellowish stripes, confluent frontally; mesosternum often ± brownish, scutellum with yellowish sides, brown centrally; propodeum blackish. Base of 1 st sternite rufous. 1 st tergite black, reddish basally and apically; 2 nd tergite reddish-yellow, with basolateral infuscate stripes; 3 rd tergite yellowish in basal 0.6, brown apically; following tergites completely brown or with narrow apical yellow margins (slightly vespoid). Legs yellowish; hind tibia cream-yellow, not or indistinctly and narrowly darkened basally and apically. Pterostigma hyaline, with darker margins.

³. Body length 3.0- 3.2 mm. Flagellum with 22-24 segments; 1 st flagellar segment 4.3- 4.9× as long as wide and 0.60× as long as eye; 2 nd segment 3.3-3.4× and preapical segment c. 2.0× as long as wide. Temple moderately and roundly narrowed behind eye, dorsally 0.8× as long as eye. OED 1.4-1.5× and OOD 1.5× ocellar diameter. Facial width 1.2× eye length and 1.2× combined length of face and clypeus. MI 0.7.

Mesosoma not or slightly depressed, 1.7-2.0× as long as high. Mesopleuron with coarse and dense but somewhat superficial punctures. Areolet oblique; vein 2m-cu reaching proximad its middle. Vein 1cu-a postfurcal by 0.4× its length, strongly inclivous. Pterostigma wide, 2.5× as long as wide. Stylet 1.3× as long as 2 nd hind tarsomere.

Color: Flagellum yellowish, fuscous distally. Head yellowish; stemmaticum and occiput brownish. Pronotum and mesopleuron rufous; mesosternum partly and metapleuron completely brownish; mesoscutum brownish, with four longitudinal yellow stripes, confluent frontally; scutellum brownish, with lateral yellow stripes; propodeum black basally and reddish in apical 1/3, sometimes entirely red. 1 st tergite black, with basal and apical yellow bands; 2 nd tergite blackish, with large triangular apical spot (2/3 of tergite length) or yellow with blackish latero-basal stripes; 3 rd tergite yellowish, apical margin and sides brownish; following tergites brown, with narrow yellowish apical margins. Fore and mid coxae and trochanters, hind tibia and tarsus cream-yellow; legs otherwise reddish-yellow. Pterostigma pale yellow, with darker margins.

Var.: 1♀ from Kirgizhia: Hind tibia slightly red apically, and hind tarsus pale.

H o s t s: Apanteles sp. (Hym. Braconidae ) in Pempelia genistella DUPONCHEL, 1837 (Lep., Pyralidae ) (EDI).

D i s t r i b u t i o n: Transpalaearctic; examined material from Bulgaria *, Croatia *, Iran *, Jordan *, Kyrgyzstan *, Morocco, Mongolia *, Spain *, Tunisia *, Turkey.