Syzeuctus robustor AUBERT , 1978

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 : 1065-1066

Syzeuctus robustor AUBERT, 1978 ( Fig. 15 )

O r i g i n a l: Syzeuctus robustor AUBERT, 1978: 132 , new name for S. robustus TELENGA.

syn. Syzeuctus robustus TELENGA, 1930: 105 , preoccupied by UCHIDA, 1928.

H o l o t y p e: (♀) "Uralsk 27.V. and 2.VII.1927, leg. Koloskov" (St. Petersburg), type not studied, high resolution photos seen.

S t u d i e d m a t e r i a l: 2♀♀, 1♂; Morocco *, Russia, Turkey *.

D e s c r i p t i o n: ♀: Body length 9 mm. Antenna with 37 flagellomeres; 1 st flagellomere 4.5× longer than wide, preapical flagellomere 1.1× longer than wide. Temple strongly and roundly narrowed apically, dorsally 0.25-0.35× as wide as eye. OED 1.1× and OOD 1.8× ocellar diameter. Frons densely punctate, slightly swollen laterally, with weak median impression. Clypeus slightly convex, c. 2× wider than long. Lower mandibular tooth smaller than upper one. MI 0.65. Genal carina reaching mandibular base.

Pronotum densely punctate, lateral pronotal groove smooth ventrally. Epicnemial carina low, with low lamella at transversal part. Speculum partly smooth. Apical transversal carina of propodeum entirely absent. Hind femur 5.4× longer than wide. Hind metatarsus 0.7× as long as hind femur. 2 nd hind tarsomere 1.35× longer than 3 rd one. Hind claw without visible teeth, strongly bent 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 distance. Hind wing with 8 distal hamuli.

1 st tergite 2.1× longer than wide, with scattered punctures. 2 nd tergite 1.2× longer than wide, with dense punctures. 3 rd tergite 1.1× longer than wide, with superficial punctures. Ovipositor 0.75× as long as fore wing, 0.95-1.0× as long as metasoma and 2.0× longer than hind tibia.

Color: Head and mesosoma mainly yellow. Antenna yellowish. Stripes between ocelli, occiput, scape dorsally, proximal 2/3 of 1 st flagellomere, three stripes on mesoscutum, three spots on mesopleuron, stripe on mesosternum, spot on metapleuron, two paramedian spots on propodeum, stripes on hind coxa and hind trochanter black. Metasoma mainly reddish; 1 st tergite with wide basal and apical yellow bands, blackish centrally; 2 nd and 3 rd tergites with basolateral yellow spots and wide apical yellow bands; 4 th and 5 th tergites with wide apical yellow bands; hypopygium yellow. Legs yellowish; hind femur, tibia and tarsus reddish. Fore wing without or with weak brown apical spot;

pterostigma brown, yellowish proximally. ♂: Body length 9 mm. Antenna with 37 flagellomeres; 1st flagellomere 4.5× longer than

wide; preapical flagellomere 1.1× longer than wide. Temple strongly and roundly narrowed apically, dorsally c. 0.3× as long as eye. OED 1.2× ocellar diameter. Frons densely punctate, with slightly swollen sides and weak median impression. Clypeus slightly convex, c. 2× wider than long. MI 1.0. Genal carina reaching mandibular base.

Pronotum densely punctate, lateral pronotal groove smooth ventrally. Epicnemial carina low, with low carina at transversal part. Apical transversal carina of propodeum absent. Hind femur 5.6× longer than wide. Hind metatarsus 0.7× as long as hind femur. 2 nd hind tarsomere 1.33× longer than 3 rd one. Hind claw without visible teeth, strongly bent apically.

1 st tergite 2.1× longer than wide, with fine scattered punctures. 2 nd tergite 1.2× longer than wide, with fine scattered punctures. 3 rd tergite 1.05× longer than wide, with superficial fine punctures.

Color: Head and mesosoma yellow. Scape yellow, brown dorsally; flagellum reddishbrown. Stripes between ocelli, occiput, three stripes on mesoscutum, spots on mesopleuron, spots on metapleuron, two paramedian spots on propodeum, stripes on hind coxa and complete hind trochanter black. 1 st to 3 rd tergites yellow; 1 st tergite blackish centrally; 2 nd and 3 rd tergites with central brown band. 4 th and 5 th tergites red, with wide yellow apical bands; 6 th and 7 th tergites reddish-brown. Legs yellowish; hind femur reddish. Fore wing without or with weak brown apical spot; pterostigma ochreous.

Figures

Figs 12-15: Habitus of ♀♀ from lateral: (12) Syzeuctus altaicus nov.sp. HT, (13) S. flagellator nov.sp. HT, (14) S. frontator nov.sp. HT, (15) S. robustus TELENGA LT (lectotype).