Contribution to the knowledge of Oriental Syzeuctus FÖRSTER (Hymenoptera, Ichneumonidae, Banchinae), with description of six new species Author Riedel, Matthias text Linzer biologische Beiträge 2022 2022-09-01 54 1 257 273 journal article 221138 10.5281/zenodo.7507419 f155b393-5df8-4acb-9c0f-c73d6634dcd1 0253-116X 7507419 Syzeuctus achterbergi nov.sp. ( figs 4 , 10 , 16 , 22 ) H o l o t y p e: ( ♀ ) Indonesia : C Sulawesi , nr Luwuk, Salodik, c 400 m , 21-31.X.1989 , Mal. trap 14, C. v. Achterberg, RMNH´89 (Leiden). P a r a t y p e: ( ♀ ) Indonesia : C Sulawesi , nr Luwuk, Bunga, c 300 m , 1-14.XI.1989 , Mal. trap 16, C. v. Achterberg, RMNH´89 (coll. RIEDEL). E t y m o l o g y: This species is dedicated to C. VAN ACHTERBERG who made important contributions to the knowledge of Oriental Hymenoptera . D e s c r i p t i o n: ♀ : Body length 9 mm . Length of fore wing 7 mm and of ovipositor 7 mm . Antenna with 39-40 flagellomeres; 1 st flagellomere 4.2× longer than wide and 0.49-0.51× as long as eye; preapical flagellomere square. Temple very short, strongly and roundly narrowed behind eye, dorsally 0.2× as long as eye. OED 1.2× and OOD 1.5× ocellar diameter. Vertex and frons coarsely and densely punctate. Frons moderately swollen laterally and strongly concavely impressed medially. Face densely punctate, inner eye margins slightly divergent ventrally. Clypeus 2.0× wider than long, with rather dense punctures, apical margin rounded. MI 0.6-0.7. Mandible with strong baso-ventral lamella, upper tooth larger than lower one. Mesosoma coarsely and densely punctate, 1.45× longer than high. Frontoventral edge of pronotum moderately curved. Side of pronotum densely punctate dorsally, with fine longitudinal striae ventro-posteriorly, pronotal groove partly smooth. Epicnemial carina low, pleural part present, transversal part weak. Mesopleuron partly with dense punctures, medially and posteriorly with scattered punctures; speculum large, smooth. Propodeum with coarse transversal rugose-punctation. Pleural carina present. Apical transverse carina of propodeum strong and complete. Hind femur 5.0-5.2× longer than wide. Hind metatarsus 0.54× as long as hind femur. 2 nd hind tarsomere 1.35-1.45× as long as 3 rd one. Hind claw with c. 4 long teeth, strongly bent apically. Areolet with long stalk; vein 2mc-u reaching areolet in its distal 0.8. Vein 1cu-a slightly postfurcal by 1-2× its width. Postnervulus intercepted in its middle. Nervellus of hind wing slightly reclivous, intercepted in its apical 0.75-0.80. Hind wing with 7-9 distal hamuli. Metasoma rather slender, tergites with narrow spiracles, spiracles not or slightly bulged. 1 st tergite 1.85-1.95× longer than wide, smooth medially, with rather dense and coarse lateral punctures. 2 nd tergite 1.4× and 3 rd tergite 1.3-1.4× longer than wide, both densely punctate but smooth in apical 0.2. Ovipositor 1.0× as long as fore wing, 1.25× longer than metasoma and 2.5× longer than hind tibia. Figs 1-3 : Habitus from dorsal: ( 1 ) Syzeuctus laoticus nov.sp. ♀ holotype (HT); ( 2 ) S. siamensis nov.sp. ♀ HT; ( 3 ) S. orientalis nov.sp. ♁ paratype (PT). Figs 4-9: Basal tergites from dorsal: ( 4 ) Syzeuctus achterbergi nov.sp. ♀ HT; ( 5 ) S. floresiensis nov.sp. ♀ HT; ( 6 ) S. genator nov.sp. ♀ HT; ( 7 ) S. laoticus nov.sp. ♀ HT; ( 8 ) S. orientalis nov.sp. ♁ PT; ( 9 ) S. siamensis nov.sp. ♀ HT. Figs 10-15: Faces from frontal: ( 10 ) Syzeuctus achterbergi nov.sp. ♀ HT; ( 11 ) S. floresiensis nov.sp. ♀ HT; ( 12 ) S. genator nov.sp. ♀ HT; ( 13 ) S. laoticus nov.sp. ♀ HT; ( 14 ) S. orientalis nov.sp. ♁ HT; ( 15 ) S. siamensis nov.sp. ♀ HT. Color: head and mesosoma black, with extensive cream-yellow coloration. Flagellum brown. Palps, mandible except teeth, clypeus, face except dorso-median black spot, wide frontal orbit, malar space and outer orbit, ventral spot on pedicel, frontal and upper margins of pronotum, spot on tegula, subtegular ridge, hook-shaped anterolateral spots and roundish central spot on mesoscutum, dumb-bell shaped stripe on mesopleuron, upper division and posterior spot on metapleuron, sides and apex of scutellum, postscutellum and transverse stripe on apical propodeum yellow. Metasoma reddish; 1 st tergite creamyellow basally and with yellow apical band. Legs red; fore and mid coxae and trochanters cream-yellow, hind coxa ± black in basal half. Fore wing with brown apical stripe; pterostigma brown. Figs 16-21: Heads from frontal: ( 16 ) Syzeuctus achterbergi nov.sp. ♀ HT; ( 17 ) S. floresiensis nov.sp. ♀ HT; ( 18 ) S. genator nov.sp. ♀ HT; ( 19 ) S. laoticus nov.sp. ♀ HT; ( 20 ) S. orientalis nov.sp. ♁ HT; ( 21 ) S. siamensis nov.sp. ♀ HT. ♁ unknown. Figs 22-23: Mesosoma from lateral: ( 22 ) Syzeuctus achterbergi nov.sp. ♀ HT; ( 23 ) S. genator nov.sp. ♀ HT. R e m a r k: This new species belongs to the villosus group sensu CHANDRA & GUPTA (1977) and runs to S. villosus (CAMERON, 1899) in their key of Oriental Syzeuctus (CHANDRA & GUPTA 1977: 138-139) . It differs by its longer ovipositor and different coloration of legs and 1 st tergite.