Picrostigeus longicauda RIEDEL, 2023

Riedel, Pénigot, Schwarz, Diller, Johansson & Japoshvili, G., 2023, Darwin wasps (Hymenoptera, Ichneumonidae) of the Kintrishi National Park, Sakartvelo (Georgia), with descriptions of six new species, Linzer biologische Beiträge 55 (1), pp. 61-153 : 147-148

Picrostigeus longicauda RIEDEL nov.sp. ( Figs 21-24 )

H o l o t y p e: (♀) SW Georgia, Kintrishi NP, 1634 m asl, 41.44535308°N 41.05384144°E, MT 12, 20.v.-1.vi.2018, leg. G. Japoshvili (Tbilisi).

P a r a t y p e s: (♀) similar label (ZSM); (♀) SW Georgia, Kintrishi NP, 2280 m, 41.45°N 42.06°E, MT 15 , 30 .vi.-14.vii.2018, leg. G. Japoshvili (Tbilisi) .

D e s c r i p t i o n: ♀. Body length (without ovipositor) 3.7-4.0 mm. Ovipositor length (seen in profile) 2.5 mm. Flagellum with 26-27 flagellomeres; 1 st flagellomere 3.5×, 2 nd flagellomere 2.8-2.9× and 3 rd flagellomere 2.6× longer than wide. Temple strongly and roundly narrowed behind eye. Occiput strongly and concavely excavated medially. Distance of lateral ocellus to eye 1.5× ocellar diameter. Face finely and transversely aciculate.

♁ unknown. Mesoscutum covered with grey setae and fine scattered punctures. Mesopleuron smooth and shining. Epicnemial carina present on mesopleuron, absent on mesosternum. Propodeum smooth and shining, with carination: area basalis and area superomedia confluent, rectangular, c 1.8× longer than wide; anterior transverse carina (costula) absent; area petiolaris wider than long. Hind femur 3.4-3.6× longer than wide. Areolet in fore wing closed (vein 3rs-m present but not pigmentate); vein 2m-cu reaching areolet slightly distad its middle.

1 st tergite 1.3-1.4× longer than wide, rugose; with strong dorsal-lateral carina; latero-median carina weak, present in basal 1/3. 2 nd tergite 2.5× wider than long, finely rugose laterally, smooth medially. Ovipositor sheath (seen from dorsal) 1.6-1.7× longer than hind tibia.

Color: black. Scape and pedicel ventrally and flagellum ochreous in proximal 2/3, distally brownish. Palps, mandible except teeth, apical margin of clypeus, narrow transverse stripe below antennal grooves and spot on frontal orbit yellowish. Hind edge of pronotum and tegula yellowish. Fore and mid legs including coxae reddish-yellow. Hind coxa brown; hind trochanter and trochantellus reddish-yellow; hind femur, tibia and tarsus ± brownish. Metasoma black. Pterostigma brownish-hyaline.

Taxonomical remark: This new species runs to P. obscurus HORSTMANN in his key of the Western Palaearctic Picrostigeus species ( HORSTMANN 1994). It differs by its longer basal flagellomeres (fig. 22) and longer ovipositor sheath (fig. 21), larger ocelli and strongly excavated occiput (fig. 24).

Figures

Figs 21-24: Picrostigeus longicauda RIEDEL nov.sp. HT: (21) habitus, (22) basal flagellomeres, (23) face, (24) head from dorsal.