Syzeuctus dusmeti SEYRIG , 1928

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 : 1035-1036

Syzeuctus dusmeti SEYRIG, 1928 (Figs 55, 66, 109)

O r i g i n a l: Syzeuctus dusmeti SEYRIG, 1928: 382

L e c t o t y p e: (♀) "Sena (Huesca), 1922 Andreu" (Madrid), type not studied.

S t u d i e d m a t e r i a l: 2♀♀ 1♂; Spain.

D e s c r i p t i o n: ♀: Body length 9.5-10 mm. Antenna with 38-40 flagellomeres; 1 st flagellomere 4.2× longer than wide. Temple strongly and roundly narrowed behind eye, dorsally c. 0.4× as long as eye. OED 1.2× ocellar diameter. Frons coarsely punctate, with moderately swollen sides, strongly impressed medially. Clypeus c. 2× wider than long, slightly convex, with scattered punctures, apical margin rounded. MI 0.7. Mandible with strong ventral lamella. Genal carina low, reaching mandibular base.

Side of pronotum coarsely and densely punctate. Speculum partly smooth. Epicnemial carina low or slightly elevated, with distinct but not dentiform carina on transversal part. Apical transversal carina of propodeum shortly present laterally, widely absent medially. Hind femur 5.4× longer than wide. Hind claw with few small basal teeth. Areolet stalked; 2 nd recurrent vein strongly distal to its middle. Nervulus postfurcal by 2× its width. Hairs on basal cell shorter than their intervals.

1 st tergite c. 2.0× longer than wide, with very scattered fine setiferous punctures, with basolateral lamelliform extension, spiracle not protruding. 2 nd tergite c. 1.1× longer than wide, with rather dense punctures. 3 rd tergite 1.1× longer than wide, with dense punctures and fine granulation. Ovipositor 0.8× as long as fore wing, about as long as metasoma and 2.1× longer than hind tibia.

Color: Black. Antenna brownish. Palps, mandible, clypeus (partly reddish-yellow), face except black central stripe, gena and wide orbits yellow. Mesosoma with rich yellow coloration. 1 st and 2 nd tergites black, with yellow antero-lateral spots and wide yellow apical bands. 3 rd tergite black, ± red apically; following tergites reddish. 3 rd to 4 th /5 th tergites with apical yellow bands. Fore and mid legs including coxae and trochanters yellowish, with brownish dorsal stripes. Hind coxa and trochanter black; hind coxa yellow dorsally; hind trochantellus yellow; hind femur and tibia reddish, hind tarsus brownish. Wings hyaline, fore wing with apical brown spot, pterostigma brown.

♂: Body length 10-10.5 mm. Antenna with 44 flagellomeres; 1 st flagellomere 4.8× longer than wide. Head with very coarse punctures. Temple shortly parallel behind eye, distinctly and roundly narrowed apically; dorsally 0.45× as long as eye. OED 1.5× ocellar diameter. Frons distinctly swollen laterally and impressed medially. Clypeus 1.8× wider than long. MI 0.85. Genal carina reaching hypostomal carina at mandibular base.

Mesosoma with very coarse punctures. Pronotal groove with almost smooth surface. Speculum punctate. Epicnemial carina low, with ± distinct lamella on transversal part. Apical transversal carina shortly present laterally, widely absent medially. Hind femur 5.5-6.0× longer than wide. Hind claw with long basal teeth. Areolet stalked; 2 nd recurrent vein strongly distal to its middle. Nervulus postfurcal by 2× its width. Hairs on basal cell shorter than their intervals.

1 st tergite 2.3-2.5× longer than wide, with coarse rather dense punctures. 2 nd tergite 1.4- 1.7× longer than wide, with coarse dense punctures. 3 rd tergite 1.25-1.3× longer than wide, with dense but superficial punctures. 1 st /3 rd to 6 th /7 th tergites with strongly enlarged reniform tergal spiracles.

Color: Similar to ♀. Antenna reddish, slightly darkened distally. Head yellow; frons medially, stemmaticum and occiput black. 1 st to 3 rd /4 th tergites black, with wide yellow apical bands, sometimes 1 st tergite with basal yellow band. Following tergites reddish, 4 th tergite with wide, 5 th tergite with narrow yellow apical bands. Coxae and trochanters yellow; hind coxa with black spot; hind trochanter reddish or brown. Legs reddish. Wings hyaline, fore wing with apical brown spot, pterostigma brown.

Hosts: Phycitinae spec. (Lep. Pyralidae ) (Edinburgh), Bazaria ruscinonella RAGONOT, 1887 (Lep. Pyralidae ) (Edinburgh).