Syzeuctus crassitarsis TELENGA , 1930

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 : 1032-1033

Syzeuctus crassitarsis TELENGA, 1930 (Figs 30, 56, 64, 107)

O r i g i n a l: Syzeuctus crassitarsis TELENGA, 1930: 105

H o l o t y p e: (♀) "Turkestan, Aschabad, 10.VI.1925, leg. Gussakovskij" (St. Petersburg), high resolution photos seen.

syn. Syzeuctus crassitarsis bicolor TELENGA, 1930: 106 , preoccupied by SZÉPLIGETI, 1899, synonymized by YU & HORSTMANN 1997: 80.

H o l o t y p e: (♀) "Turkestan, Syr-Darja-Gebiet, 1927" (St. Petersburg), not studied.

syn. nov. Syzeuctus pallidator AUBERT, 1966: 39

L e c t o t y p e: (♀) "[red] Type; Syzeuctus pallidator AUB. ♀; J.F. Aubert Sineurada coll Dumont 1921 Tozeur Tunisie " (Lausanne), type studied and designated as lectotype here .

S t u d i e d m a t e r i a l: 5♀♀, 2♂♂; Mongolia *, Morocco *, Tunesia*, Turkmenistan,

Uzbekistan. D e s c r i p t i o n: ♀: Body length 7-10 mm. Antenna with 31-36 flagellomeres ; 1st

flagellomere 5.2-6.7× longer than wide and 0.65-0.67× longer than eye; preapical flagellomere square. Temple moderately to strongly and roundly narrowed behind eye, dorsally 0.3-0.4× as long as eye. OED 1.2-1.3× and OOD 2.0× ocellar diameter. Frons with scattered or rather dense punctures, moderately impressed medially. Face with scattered to dense punctures. Clypeus 2.0-2.1× wider than long, with scattered punctures. MI 0.6-0.8. Mandible with ventral lamella rather slender and long, lower tooth small, 0.5× as long as upper one. Genal carina reaching mandibular base.

Mesosoma 1.5-1.55× longer than high. Mesoscutum, mesopleuron and metapleuron with coarse rather dense punctures. Frontoventral edge of pronotum moderately curved; lateral pronotal groove partly smooth. Speculum punctate. Epicnemial carina low, without distinct carina on transversal part, low carina on pleural part present. Propodeum with rather dense punctures, apical transversal carina complete. Hind leg stout, hind femur 4.1-4.4× longer than wide. Hind metatarsus 0.65-0.70× as long as hind femur. Hind tarsomeres with strong apical bristles. 2 nd hind tarsomere 0.85-0.95× as long as 3 rd hind tarsomere. Hind claw ± pectinate, moderately curved apically. Areolet with long stalk, stalk almost as long as areolet; 2 nd recurrent vein distinctly distal to its middle. Nervulus interstitial or slightly postfurcal by 1× its width. Hairs on basal cell much shorter than their intervals.

1 st tergite 1.5-1.9× longer than wide, with scattered to rather dense punctures. 2 nd tergite 1.1-1.4× longer than wide, with fine scattered setiferous punctures. 3 rd tergite 1.1-1.5× longer than wide, with scattered to rather dense but superficial punctures. Ovipositor 1.2- 1.4× longer than fore wing, 1.5-1.75× longer than metasoma and 2.9-3.4× longer than hind tibia.

Color: Mainly cream-yellow. Antenna reddish, basal flagellomeres ± blackish. Mandibular teeth, sometimes median stripe on frons, stemmaticum, occiput partly, three stripes on mesoscutum, scutoscutellar groove, sometimes small spot on mesopleuron, two paramedian spots on propodeum and sometimes stripe on dorsal metapleuron black. Tergites red, with wide basal and apical yellow bands; basal tergites sometimes with vshaped blackish basal spots. Legs yellow; all femora and sometimes mid and hind trochanters and/or mid and hind tibiae with dorsal brown stripes; tips of hind tibia and hind tarsomeres sometimes brownish. Fore wing with subapical brown spot; pterostigma

brownish, yellow proximally. ♂: Body length 11 mm. Antenna with 36 flagellomeres; 1st flagellomere 5.1× longer than

wide and 0.65× as long as eye. Temple shortly parallel behind eye, moderately and roundly narrowed apically, dorsally 0.4× as long as eye. OED 1.1× ocellar diameter. MI 0.65. Hind femur 4.5× longer than wide; hind metatarsus 0.7× as long as hind femur; 2 nd hind tarsomere about as long as 3 rd one.

1 st tergite 1.75× longer than wide, with rather dense punctures; 2 nd tergite 1.2× longer than wide, with dense punctures; 3 rd tergite 1.2× longer than wide, with dense but superficial punctures.

Color: As in ♀, but with black stripes on margins of pronotum, mesopleuron and metapleuron. Epicnemium behind fore coxa blackish.

Hosts unknown.

R e m a r k: Although I was not able to study the type of S. crassitarsis , the high quality photos of the holotype kindly sent by D. Kasparyan together with the similarities of coloration and form hind tarsus convinced me to synonymize this species with S. pallidator . The taxon seems to be rather widespread in the Southern Palaearctic region.