Syzeuctus decoratus ( COSTA , 1890)

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 : 1033-1034

Syzeuctus decoratus ( COSTA, 1890) (Figs 33, 65, 108)

O r i g i n a l: Lissonota decorata COSTA, 1890: 17

syn. Lissonota formosa TOSQUINET, 1900: 162-165 , preoccupied by BRIDGMAN, 1887, synonymized by AUBERT 1967: 69.

H o l o t y p e: (♀) " type; Russia Sarepta 1880 B.; collection Dr. J. Tosquinet; Lissonota formosa TOSQ. dét. J. Tosquinet " (Bruxelles), type studied .

syn. Lissonota hortobagyensis KISS, 1926b: 245-248 , synonymized by BAJARI 1959.

L e c t o t y p e: (♀) "Hortobágy Szilády, 923.VII.4; Typus Lissonota hortobágyensis n.sp. " (Budapest), type not studied .

S t u d i e d m a t e r i a l: 2♀♀ 3♂♂, Kyrgyzstan *, Russia (Wolgograd).

D e s c r i p t i o n: ♀:Body length 10-11 mm. Antenna with 36 flagellomeres; 1 st flagellomere 3.8× longer than wide and 0.55× as long as eye; preapical flagellomere 1.2× longer than wide. Temple distinctly narrowed or shortly parallel behind eye, strongly and roundly narrowed apically, dorsally c. 0.4-0.5× as wide as eye. OED 1.1-1.2× and OOD 1.5× ocellar diameter. Frons with scattered or dense punctures, sides slightly swollen, with moderate median impression. Clypeus moderately convex, 1.5-1.6× wider than long, with scattered punctures. MI 0.75-0.9. Genal carina reaching mandibular base.

Mesosoma 1.4× longer than high. Frontoventral edge of pronotum moderately or sharply curved, lateral pronotal groove smooth ventrally. Epicnemial carina low, without distinct lamella at transversal part. Speculum punctate. Apical transversal carina of propodeum complete and strong. Hind femur 5.5-5.7× longer than wide. Hind metatarsus 0.7× as long as hind femur. 2 nd hind tarsomere 1.3-1.4× longer than 3 rd one. Hind claw long, pectinate, moderately bent apically. Areolet stalked, 2 nd recurrent vein slightly proximal or distal to its middle. Nervulus postfurcal by 1× its width. Hairs on basal cell shorter than their distance. Hind wing with 9 distal hamuli.

Metasoma rather stout. 1 st tergite 1.4-1.5× longer than wide, with dense punctures. 2 nd tergite 1.05× wider than long, with dense punctures. 3 rd tergite 1.0-1.05× wider than long, with ± superficial punctures. Spiracles of 1 st to 3 rd tergites slightly protruding. Ovipositor 0.9× as long as fore wing, 1.0-1.2× as long as metasoma and 2.0-2.1× longer than hind tibia.

Color: Head largely yellow. Scape brownish, sometimes yellow ventrally; Antenna reddish, basal two flagellomeres ± black. Anterior tentorial pit, median stripes of face and frons, stemmaticum and occiput black. Mesosoma largely yellow; three stripes on mesoscutum, three spots on mesopleuron, stripe on mesosternum, spots on metapleuron and two paramedian spots on propodeum black. Metasoma mainly red; 1 st to 5 th tergites with apical cream-yellow bands, sometimes 1 st tergite with basolateral yellow spot. Fore and mid coxae mainly yellow, fore and mid trochanters brown, yellow frontally, hind coxa yellow dorsally and red ventrally; hind trochanter brown, hind trochantellus yellow. Femora, tibiae and tarsi red; fore and mid tibiae yellow frontally, hind tibia yellow in basal 0.15. Wings hyaline; pterostigma ochreous, yellowish proximally.

♂: Body length 9-9.5 mm. Antenna with 35-36 flagellomeres, 1 st flagellomere 4.4× longer than wide and 0.55× as long as eye. Temple shortly parallel behind eye and moderately narrowed apically. OED 1.6× ocellar diameter. Frons slightly swollen laterally and moderately impressed medially. Face densely punctate. Clypeus 1.8× wider than long, with scattered punctures. MI 1.0. Mandible with ventral lamella; lower tooth c. 0.5× as long as upper one. Genal carina reaching mandibular base.

Frontoventral edge of pronotum moderately curved, lateral pronotal groove smooth. Epicnemial carina low, with narrow lamella opposite to ventral edge of pronotum. Speculum punctate. Apical transversal carina of propodeum complete, area petiolaris rugose. Hind femur 4.8-5.0× longer than wide. Hind metatarsus 0.75-0.8× as long as hind femur. 2 nd hind tarsomere 1.2× longer than 3 rd one. Hind claw densely pectinate, moderately curved apically. Areolet stalked, 2 nd recurrent vein distal to the middle. Nervulus postfurcal by 1-2× its width.

1 st tergite 1.45-1.55× longer than wide, with coarse and dense punctures. 2 nd tergite 1.0× as long as wide, with dense punctures. 3 rd tergite about as long as wide, with dense punctures. Spiracles of 2 nd and 3 rd tergites slightly protruding laterally.

Color: Black. Yellow are palps, mandible except teeth, clypeus, face except central black stripe, malar space, gena and wide orbits. Mesosoma with extended yellow coloration: pronotum largely, large spots on mesopleuron and metapleuron, upper division of metapleuron, tegula, subtegular ridge, scutellum and postscutellum, four confluent stripes on mesoscutum, triangular central spots and anterolateral stripes on propodeum. 1 st tergite blackish, following tergites ± red; 1 st to 3 rd /5 th tergites with wide apical yellow bands, 1 st tergite with subbasal yellow spot. Fore and mid coxae and trochanters mainly yellow; hind coxa yellow dorsally and apicoventrally; hind trochanter blackish with yellow apical margin, hind trochantellus yellow. For and mid legs yellow, femora with dorsal blackish stripes; hind femur red, with external yellow stripe; hind tibia yellow, reddish internally, hind tarsus ± brown. Wings hyaline, pterostigma brown, yellow in proximal third.

Hosts unknown. R e m a r k: The description of ♂♂ bases on the material from Kyrgyzstan here, the separation from ♂♂ of S. maculipennis is not clear yet and needs more material for comparison.