Syzeuctus tigris SEYRIG , 1926

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 : 1071-1073

Syzeuctus tigris SEYRIG, 1926 ( Figs 49 , 91, 137)

O r i g i n a l: Syzeuctus tigris SEYRIG, 1926: 129

H o l o t y p e: (♀) Panarroya (Sierra Morena), VI-1923 (Madrid), type not studied.

S t u d i e d m a t e r i a l: 45♀♀, 31♂♂; Croatia *, France, Gran Canaria, Italy *,

Malta, Morocco *, Sicily , Spain, Tunesia *. D e s c r i p t i o n: ♀: Body length 8-10 mm. Antenna with 28-32 flagellomeres ; 1st

flagellomere 4.2-4.4× longer than wide and 0.5× as long as eye; preapical flagellomere square or slightly transverse. Temple strongly and roundly narrowed behind eye, dorsally 0.3× as long as eye. OED 1.2-1.3× and OOD 1.6× ocellar diameter. Frons coarsely punctate, smoothened and strongly impressed medially, moderately swollen laterally. Face densely punctate, centrally protruding. Clypeus small, c. 1.7× wider than long, with scattered punctures, apical margin rounded. MI 0.75. Genal carina reaching hypostomal one close to mandibular base.

Mesosoma very coarsely and densely punctate. Frontoventral edge of pronotum strongly curved. Lateral pronotal groove punctate. Speculum partly smooth. Epicnemial carina low, carina on pleural part present, without carina on transversal part. Apical transversal carina of propodeum ± present laterally, absent medially. Hind femur 5.0-5.6× longer than wide. Hind metatarsus 0.6× as long as hind femur. 2 nd hind tarsomere 1.4× longer than 3 rd one. Hind claw with basal teeth, strongly curved apically. Areolet stalked; 2 nd recurrent vein distal to its middle. Nervulus postfurcal by 2× its width. Hairs on basal cell shorter than or as long as their intervals. Hind wing with 9 distal hamuli.

Metasoma slender. 1 st tergite 2.2-2.5× longer than wide, almost smooth, with very few lateral punctures. 2 nd tergite 1.25-1.6× longer than wide, with fine setiferous punctures. 3 rd tergite 1.1-1.15× longer than wide. 2 nd to 3 rd /4 th tergites with triangular antero-medial areas. Spiracles of 2 nd and 3 rd tergites slightly protruding laterally. Ovipositor 1.05-1.15× longer than fore wing, 1.25-1.35× longer than metasoma and 2.6-3.2× longer than hind tibia.

Color: Black. Mandible except teeth, clypeus, face, gena and wide orbit yellow. Mesosoma mainly yellow; three stripes on mesoscutum, scuto-scutellar groove, ventral and posterior margins of pronotum, wide margins of mesopleuron, mesosternum, margins of metapleuron and two oblique paramedian stripes on propodeum black. 1 st to 4 th /5 th tergites black; 1 st tergite yellow subbasally; 1 st to 5 th /6 th tergites with wide apical yellow bands; 5 th or 6 th and 7 th tergites usually reddish. Fore and mid coxae and trochanters, hind coxa dorsally and all trochantelli yellow. Fore and mid legs mainly yellow-red, mid tarsus ± brown. Hind leg brownish; hind femur apically and hind tibia basally (sometimes also apically) yellow. Fore wing with apical brown stripe; pterostigma brown.

♂: Body length 7-7.5 mm. Antenna with 28-31 flagellomeres. Temple strongly and roundly narrowed behind eye, dorsally 0.3× as long as eye. OED 1.2× ocellar diameter. Frons coarsely punctate, smoothened and strongly impressed medially, sides moderately swollen. Face densely punctate, centrally protruding. Clypeus small, 1.7-2.0× wider than long, with scattered punctures, apical margin rounded. MI 0.9. Genal carina reaching hypostomal one close to mandibular base.

Mesosoma very coarsely and densely rugose-punctate. Lateral pronotal groove rugosepunctate. Speculum partly smooth. Epicnemial carina low or slightly elevated, pleural part present, transversal part absent. Apical transversal carina of propodeum widely absent medially. Hind femur 5.3-5.4× longer than wide. Hind claw with basal teeth. Areolet with long stalk; 2 nd recurrent vein strongly distal to its middle. Nervulus postfurcal by 2× its width.

1 st tergite 2.2-2.7× longer than wide, almost smooth, with very few lateral punctures. 2 nd tergite 1.3-1.6× longer than wide. 3 rd tergite 1.1-1.4× longer than wide.

Color: Black. Flagellum reddish-brown, darker basally. Head yellow; median stripes of face and frons, stemmaticum and occiput black. Mesosoma mainly yellow; three stripes on mesoscutum, scuto-scutellar groove, ventral and posterior margins of pronotum, wide margins of mesopleuron, mesosternum, margins of metapleuron and two oblique paramedian stripes on propodeum black. Tergites blackish or dark brownish; 1 st tergite with wide basal and apical yellow band; 2 nd to 6 th /7 th tergites with wide apical yellow bands. Fore and mid legs yellow. Hind coxa brown, yellow apically; hind trochanter brown, hind trochantellus yellow; hind femur reddish-brown, sometimes yellowish apically; hind tibia brown, yellow in basal 1/4; mid and hind tarsi brown. Wings hyaline, fore wing with apical brown spot; pterostigma brown.

Hosts unknown.

Figures

Figs 49-52: Basal tergites of ♀♀ from dorsal: (49) Syzeuctus tigris SEYRIG, (50) S. vigil (TOSQUINET) HT, (51) S. ibericus nov.sp. HT, (52) S. kazakhstanicus nov.sp. PT. Figs 53-55: Basal tergites of ♂♂: (53) Syzeuctus flavator nov.sp. HT, (54) S. flagellator nov.sp., (55) S. dusmeti SEYRIG with enlarged tergal spiracles, from lateral. Fig. 56: Hind tarsomere of Syzeuctus crassitarsis TELENGA ♀.