Syzeuctus rufigaster, Riedel, 2021

Riedel, Matthias, 2021, The genus Syzeuctus FÖRSTER in the Western Palaearctic region and Central Asia (Hymenoptera, Ichneumonidae, Banchinae), with descriptions of 17 new species, Linzer biologische Beiträge 52 (2), pp. 1013-1098 : 1067-1068

Syzeuctus rufigaster nov.sp. ( Figs 23 , 47, 88, 134)

H o l o t y p e: (♀) Kirgizia sept-west 22.5.94, 20 km W Czolpon-Ata 42,8 N 77,4 E (Issik-kul), leg. K. Denes jr. (Linz).

P a r a t y p e: (♀) Kirgizia sept-west, 20 km W Czolpon-Ata 42,8 N 77,4 E (Issik-kul), leg. J Kadlec 22.5.94 (Linz).

S t u d i e d m a t e r i a l: 2♀♀; Kyrgyzstan *.

D e s c r i p t i o n: ♀: Body length 9-10 mm. Antenna with 35-36 flagellomeres; 1 st flagellomere 4.8× longer than wide and 0.6× as long as eye; preapical flagellomere 1.1- 1.2× longer than wide. Temple shortly parallel behind eye, strongly narrowed apically. OED 1.7× and OOD 2.2× ocellar diameter. Frons moderately protruding laterally and impressed medially, with partly scattered punctures, shining. Face densely punctate, inner eye margins parallel. Clypeus 1.5-1.7× wider than long, convex, with very scattered punctures; apical margin rounded. MI 0.7-0.8. Genal carina reaching mandibular base.

Mesosoma with coarse dense punctures; 1.5× longer than high. Frontoventral edge of pronotum moderately curved, lateral pronotal groove smooth. Speculum punctate. Epicnemial carina low, with dentiform lamella on transversal part. Apical transversal carina of propodeum complete. Hind femur 5.3-5.6× longer than wide; hind leg rather slender, hind metatarsus 0.7× as long as hind femur. Hind claw with long teeth, moderately curved apically. Areolet stalked, 2 nd recurrent vein distal to its middle. Nervulus postfurcal by 2× its width. Hairs on basal cell much shorter than their intervals. Hind wing with 8 distal hamuli.

Metasoma stout; 1 st tergite 1.3-1.4× longer than wide, with rather dense coarse punctures laterally. 2 nd tergite 1.0-1.15× wider than long, with dense punctures. 3 rd tergite 1.1-1.2× wider than long, densely punctate. Ovipositor 1.3× as long as fore wing, 1.7-1.8× as long as metasoma and 3.0× longer than hind tibia.

Color: Black. Flagellum dark reddish-brown, black basally. Mandible except teeth, clypeus, complete orbits and malar space yellow. Mesosoma with extended yellow coloration: frontal and upper margins of pronotum, tegula, subtegular ridge, hook-shaped anterolateral and central spots on mesoscutum, scutellum and postscutellum, spots in mesopleuron, metapleuron and propodeum yellow (yellow spots smaller in paratype). 1 st to 5 th tergites completely reddish, 6 th and 7 th tergites brownish. Coxae and trochanters black, with ± yellow spots. Legs otherwise reddish; fore and mid legs yellowish frontally, fore femur brownish dorsally; hind tibia yellow basally or externally. Hind tarsus ± brownish. Wings hyaline, without brown spots; pterostigma brown, yellow proximally.

♂ and hosts unknown.

R e m a r k: This new species resembles S. inaequalis (FONSCOLOMBE) , but differs by the extended yellow coloration of mesosoma, hyaline wings and complete apical transversal carina of propodeum.

Figures

Figs 22-23: Habitus from lateral: (22) Syzeuctus ruficoxis nov.sp. HT, (23) S. rufigaster nov.sp. HT. Fig. 24: Mesoscutum of Syzeuctus brevipunctatus nov.sp. HT.