Syzeuctus flavator, 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 : 1039

Syzeuctus flavator nov.sp. ( Figs 4 , 11, 53)

H o l o t y p e: (♂) " Mongolia, 80 km W Ulaanbaatar, dunes, 1230 m, 17.8.1007, M. Halada lg." (Linz).

S t u d i e d m a t e r i a l: 1♂; Mongolia *. D e s c r i p t i o n: ♂: Body length 7.3 mm. Antenna with 35 flagellomeres ; 1st

flagellomere 3.7× longer than wide and 0.54× as long as eye; preapical flagellomere 1.3× longer than wide. Head covered with short hairs. Temple shortly parallel behind eye and roundly narrowed apically, dorsally 0.45× as long as eye. OED 1.6× and OOD 2.1× ocellar diameter. Frons punctate, slightly swollen laterally and slightly impressed medially. Clypeus 2.0× wider than long. MI 0.8. Genal carina reaching mandibular base.

Ventrofrontal edge of pronotum strongly curved, lateral pronotal groove smooth. Epicnemial carina low, without carina on transversal part. Propodeum with dense, coarse punctures; apical transversal carina complete. Hind femur 4.6× longer than wide. Hind metatarsus 0.75× as long as hind femur. 2 nd hind tarsomere 1.2× longer than 3 rd one. Hind claw with few long teeth, moderately bent apically. Areolet stalked; 2 nd recurrent vein in its middle. Nervulus postfurcal by 1× its width. Hairs on basal cell much shorter than their intervals. Hind wing with 9 distal hamuli.

1 st tergite 1.25× longer than wide, with scattered punctures laterally. 2 nd tergite 1.1× wider than long, with dense punctures. 3 rd tergite as long as wide, with dense but rather superficial punctures.

Color: Yellow. Antenna brown basally, reddish-brown in apical 2/3. Tergites yellow, with diffuse narrow reddish stripes basally and laterally. Legs yellow; hind femur ventrally and hind tibia internally reddish. Wings hyaline; pterostigma yellow, paler proximally.

♀ and hosts unknown.

R e m a r k: This new taxon is characterized by its small size, almost complete yellow coloration and stout metasoma.

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.