Syzeuctus immedicatus CHANDRA & GUPTA, 1977

Riedel, Matthias, 2022, Contribution to the knowledge of Oriental Syzeuctus FÖRSTER (Hymenoptera, Ichneumonidae, Banchinae), with description of six new species, Linzer biologische Beiträge 54 (1), pp. 257-273 : 265-267

Syzeuctus immedicatus CHANDRA & GUPTA, 1977

M a t e r i a l e x a m i n e d: Laos: 35 km NE Vientiane, Lao Pako env, 50 m, 18°10´N 102°52´E, 4♀♀ 1♁ 1-4. VI.2004, leg. Jendek & Sausa (Linz) ; Indonesia: W Sumatra, Mt. Sanggul , ∼ 1400 m, 30 km N Paykumbuh, 1♀ I.2007, leg. Jakl (Linz) ; Indonesia: N Sumatra, Ketambe , near N.P. Gn. Leuser, c 400 m, 1♁ IV.1994, Mal. Trap, leg. Y. v. Nierop & C. v. Achterberg (Leiden) ; S Vietnam: Dông Nai, Cát Tiên N.P., Dong trail, Mal. traps, c 100 m, 1♀ 2♁♁ 13-19. V.2007, leg. C. v. Achterberg & R. de Vries (Leiden) ; S Vietnam: Dak Lak, Chu Yang Sin N.P., Krong, K´Mar, Mal. traps 13-23, 590- 810 m, 1♁ 22-26.X.2005, leg. C. v. Achterberg & R de Vries (Leiden) ; S Vietnam: Dông Nai, Cát Tiên N.P., Botanical garden, Mal. traps, c 100 m, 1♀ 1♁ 13- 20. V.2005, leg. C. v. Achterberg & R. de Vries (Leiden) ; S Vietnam: Dông Nai, Cát Tiên N.P., Crocodile tr., Mal. traps, c. 100 m, 1♁ 13-19. V.2007, leg. C. v. Achterberg & R. de Vries (Leiden) .

D e s c r i p t i o n: ♀: Body length 13.0- 13.5 mm. Length of fore wing 8.5-9.0 mm and of ovipositor 8.0-9.0 mm. Antenna with 46-49 flagellomeres; 1 st flagellomere 5.3× longer than wide and 0.66× as long as eye; preapical flagellomere square or slightly longer than wide. Temple very short, strongly and roundly narrowed behind eye, dorsally 0.2× as long as eye. OED 1.2× and OOD 1.2-1.3× ocellar diameter. Vertex with scattered punctures. Frons with fine dense punctures, slightly swollen laterally and slightly impressed medially. Face densely punctate, finely granulate, ± dull. Clypeus convex, 1.9× wider than long, apical margin rounded. MI 0.3-0.5. Mandible with baso-ventral lamella, lower tooth slightly shorter than upper tooth.

Mesosoma densely punctate, covered with grey setae, 1.45× longer than high. Frontoventral edge of pronotum moderately curved. Side of pronotum densely punctate, posterior margin with some coarse longitudinal rugae, pronotal groove partly smooth. Epicnemial carina low, pleural part short, ending in ventral third of mesopleuron, transversal part present as short lamella. Pleural carina present. Apical transverse carina of propodeum complete and distinct. Legs slender; hind femur 5.6-5.8×. Hind metatarsus 0.58-0.65× as long as hind femur. 2 nd hind tarsomere 1.5× as long as 3 rd one. Hind claw with c. 5 teeth, strongly bent apically (c.90°).

Areolet with long stalk (stalk longer than areolet); vein 2m-cu reaching areolet in its distal 0.8. Vein 1cu-a postfurcal by 2-3× its width. Postnervulus intercepted behind its middle. Hind wing with 9-10 distal hamuli.

Metasoma slender, tergites with narrow spiracles, spiracles of 1st and 2nd tergites slightly bulging. 1 st tergite 2.0-2.6× longer than wide, with rather coarse dense punctures, almost smooth medially, shining. 2 nd tergite 1.30-1.45× longer than wide, with dense punctures and fine granulation, ± dull. 3 rd tergite 1.30-1.40× as long as wide, with dense punctures, ± dull. Ovipositor 0.9-1.0× as long as fore wing, 1.0-1.2× as long as metasoma and 2.0- 2.3× longer than hind tibia.

Color: Black. Flagellum black. Palps, mandible, clypeus, face, gena, complete orbits (widened on frontal orbit), scape and pedicel, frontal and upper margins of pronotum, tegula, subtegular ridge, anterolateral and central spots on mesoscutum, two spots on mesopleuron, upper division and apical spot of metapleuron, scutellum except black median stripe, postscutellum, area spiracularis frontally and wide triangular spot on posterior propodeum yellow. 1 st to 4 th tergites with basal red or reddish-yellow bands, 1 st to 5 th tergites with apical yellow bands. Sternites yellow, with ± distinct brown lateral spots; hypopygium black with yellow hind margin. Fore and mid coxae and trochanters and all trochantelli yellow. Hind coxa black, yellow in apical third. Fore and mid legs yellow, its femora with reddish dorsal stripes. Hind femur red, sometimes narrowly infuscate basally; hind tibia red, ± infuscate apically; hind tarsus black. Wings hyaline; fore wing with subapical brown spot. Pterostigma brown.

♁: Body length 14 mm. Antenna with 49-50 flagellomeres; 1 st flagellomere 5.0× longer than wide, preapical flagellomeres longer than wide. Hind femur 5.6× longer than wide. Hind metatarsus 0.75× as long as hind femur. 2 nd hind tarsomere 1.45x as long as 3 rd hind tarsomere. 1 st tergite 2.35× longer than wide. 2 nd tergite 1.53× longer than wide and 3 rd tergite 1.45× longer than wide. Structure otherwise as described for the ♀.

Color: Black, yellow coloration more extendend than in the ♀: in addition flagellum yellowish ventrally; propleuron and mesosternum yellow; 1 st to 4 th tergites with basal yellow bands and all tergites with apical yellow bands; hind tibia ochreous, infuscate in apical 0.1.

In ♁♁ from Vietnam, hind femur yellowish with internal and external brownish stripes. Color pattern otherwise as described for the ♀.

D i s t r i b u t i o n: Apparently widespread in the Oriental region, known from China, India and Myanmar, new records for Indonesia, Laos and Vietnam.