Syzeuctus bicolor SZÉPLIGETI , 1899

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 : 1024-1025

Syzeuctus bicolor SZÉPLIGETI, 1899 (Figs 58, 101)

O r i g i n a l: Syzeuctus bicolor SZÉPLIGETI, 1899: 31 L e c t o t y p e: (♀) " Svábheg 898. VI.26; Syzeuctus bicolor SZÉPL. ; Szépligeti 07" (Budapest), type

studied. syn. Ichneumon maculatorius FABRICIUS, 1787: 261 , preoccupied by MÜLLER, 1776, synonymized

with bicolor by SCHMIEDEKNECHT 1907, type lost. S t u d i e d m a t e r i a l: 6♀♀, 8♂♂; Bulgaria *, Croatia, France, Germany, Hungary, Slovakia,

Spain. D e s c r i p t i o n: ♀: Body length 9-9.5 mm. Antenna with 37-38 flagellomeres ; 1st

flagellomere 4.6-4.8× longer than wide and 0.6× as long as eye; preapical flagellomere 1.0-1.1× longer than wide. Temple strongly and roundly narrowed behind eye, dorsally 0.55× as long as eye. OED 1.3-1.6× and OOD 2.1× ocellar diameter. Frons strongly impressed medially, sides distinctly swollen, with dense punctures. Face densely punctate, centrally protruding, inner eye margins slightly convergent ventrally. Clypeus 1.6-1.7× wider than long, with rather dense punctures, apical margin rounded. MI 0.6- 0.65. Genal carina reaching mandibular base.

Mesosoma densely punctate, 1.4× longer than high. Lateral pronotal groove smooth. Speculum with partly scattered punctures. Epicnemial carina low, with dentiform lamella on transversal part. Apical transversal carina of propodeum complete. Hind femur 5.0- 6.1× longer than wide. Hind metatarsus 0.65-0.7× as long as hind femur. 2 nd hind tarsomere 1.3-1.35× longer than 3 rd one. Hind claw with short basal teeth, moderately curved apically. Areolet stalked; 2 nd recurrent vein distal to its middle. Nervulus postfurcal by 2× its width. Hairs on basal cell about as long as their intervals. Hind wing

with 9 distal hamuli. Metasoma rather slender; 1st tergite 1.6-1.9× longer than wide, with scattered lateral

punctures. 2 nd tergite 0.95-1.2× longer than wide, with scattered or rather dense punctures. 3 rd tergite 1.0-1.1× longer than wide, densely punctate. Ovipositor 1.1-1.4× longer than fore wing, 1.3-1.8× longer than metasoma and 2.7-3.6× longer than hind tibia.

Color: Black. Mandibular base, clypeus, wider inner and narrow outer orbits, usually median stripe of face, upper margin of pronotum, anterolateral and central spots on mesoscutum, spot on mesopleuron, tegula, spot on subtegular ridge, scutellum except anteromedian black spot, postscutellum, apical band on propodeum, and apical bands on 1 st- 4 th tergites yellow. Coxae and trochanters black; fore and mid trochanters with yellow spots; all trochantelli yellow; fore and mid legs yellow, mid tarsus brown; hind femur black, yellow in apical 0.2; hind tibia yellow, black in apical third, hind tarsus brownish. Wings with (often weak) apical brown stripes, pterostigma brown.

♂: Body length 8-9 mm. Antenna with 36-38 flagellomeres; 1 st flagellomere c. 4.4× longer than wide; preapical flagellomere 1.1× longer than wide. Temple shortly parallel behind eye, moderately narrowed apically, dorsally 0.35× as long as eye. OED 1.4-1.6× ocellar diameter. Clypeus 1.6× wider than long. MI 0.7-0.85. Genal carina reaching mandibular base.

Pronotal groove smooth or punctate. Epicnemial carina moderately elevated, with dentiform lamella on transversal part. Apical transversal carina of propodeum complete. Hind femur 5.7× longer than wide. Areolet stalked, 2 nd recurrent vein distal to the middle. Nervulus postfurcal by 1-3× its width.

Metasoma slender; 1 st tergite 1.9× longer than wide, with very scattered fine punctures. 2 nd tergite 1.1-1.15× longer than wide, with scattered fine punctures, 3 rd tergite 1.1-1.25× longer than wide, with rather dense, fine and sometimes superficial punctures.

Color: Black. Flagellum black or red, basal flagellomeres darkened. Mandible except teeth, clypeus, median stripe on face, malar space and wide orbits yellow. Mesosoma with extended yellow coloration. Metasoma black, 1 st tergite with basal or subbasal and apical yellow band; 2 nd- 4 th /5 th tergites with wide apical yellow bands. Coxae and trochanters black; fore and mid or all coxae and trochanters with yellow stripes; all trochantelli yellow; fore and mid legs yellow; hind femur brownish, narrowly yellow apically; hind tibia yellow, brown in apical 1/3-2/3; hind tarsus brown. Fore wing weakly brownish apically, pterostigma brown, yellowish proximally.

Hosts unknown.

R e m a r k: My interpretation of Syzeuctus bicolor corresponds with the interpretation of HORSTMANN (1999: 52).