Syzeuctus hyalinus, 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 : 1045-1046

Syzeuctus hyalinus nov.sp. ( Figs 3 , 16 , 36, 73, 116)

H o l o t y p e: (♀) "MGL-Övörkhangay 12 km SW Arvaykheer, N 46°22´E 102°49´, 1770 m, 3.VII.2004, J. Halada leg." (Linz).

P a r a t y p e s: (2♀♀) labeled as on the holotype (Linz, coll. Riedel).

S t u d i e d m a t e r i a l: 3♀♀; Mongolia *.

D e s c r i p t i o n: ♀: Body length 9-9.5 mm. Distal flagellomeres of all specimens broken off; 1 st flagellomeres 3.8× longer than wide and 0.54× as long as eye. Temple moderately and roundly narrowed apically, dorsally c. 0.35× as wide as eye. OED 1.5× and OOD 2.2× ocellar diameter. Frons densely punctate, with weak median impression. Face with dense punctures, finely granulate. Clypeus moderately convex, c. 1.7× wider than long, with scattered punctures, shining. MI 0.9-1.0. Genal carina reaching mandibular base.

Mesosoma c. 1.55× longer than high. Lateral pronotal groove smooth ventrally. Epicnemial carina low, with low but dentiform lamella on transversal part. Speculum punctate. Apical transversal carina of propodeum complete. Hind femur 5.1-5.4× longer than wide. Hind metatarsus 0.7× as long as hind femur. 2 nd hind tarsomere 1.2-1.4× longer than 3 rd one. Hind claw with short teeth, moderately bent apically. Areolet stalked; 2 nd recurrent vein in its middle. Nervulus interstitial or slightly postfurcal by 1× its width. Hairs on basal cell much shorter than their intervals. Hind wing with 8-10 distal hamuli.

Metasoma stout; 1 st tergite 1.4-1.55× longer than wide, with dense punctures. 2 nd tergite 1.05-1.1× wider than long, with dense punctures. 3 rd tergite 1.1-1.2× wider than long, with dense punctures. Ovipositor 1.15-1.2× longer than fore wing, 1.6-1.7× longer than metasoma and 2.9-3.0× longer than hind tibia.

Color: Head and mesosoma mainly yellow. Scape and pedicel black; flagellum reddish, basal flagellomeres black. Mandibular teeth, anterior tentorial pit, median stripe and sometimes two paramedian stripes of face, median stripe of frons, stemmaticum and occiput, three stripes on mesoscutum, scuto-scutellar groove, two stripes on mesopleuron, stripe on mesosternum, margins of metapleuron and two oblique paramedian stripes on propodeum black. Metasoma mainly black; 1 st tergite apically, 2 nd and 3 rd tergites entirely and 4 th tergite basally dark reddish or reddish-brown; 1 st to 4 th tergites with apical yellow bands. Fore and mid legs yellow; fore and mid femora with brown stripes dorsally; hind coxa and trochanter black ventrally, yellow dorsally; hind trochantellus completely yellow; hind femur yellow dorsally and reddish-brown ventrally; hind tibia yellow externally and reddish internally; mid and hind tarsi ± reddish-brown. Wings hyaline; pterostigma brownish, yellow proximally.

♂ unknown.

Figures

Figs 1-6: Habitus of ♀♀ from dorsal: (1) Syzeuctus altaicus nov.sp. HT (holotype), (2) S. flagellator nov.sp. HT, (3) S. hyalinus nov.sp. HT, (4) S. flavator nov.sp. HT (♂), (5) S. frontator nov.sp. HT, (6) S. maroccanus nov.sp. HT.

Figs 16-18: Habitus of ♀♀ from lateral: (16) Syzeuctus hyalinus nov.sp. HT, (17) S. ibericus nov.sp. HT, (18) S. maroccanus nov.sp. HT.