Scopesis longigena ( THOMSON , 1894), 2024

Riedel, Matthias, H, Andres & Schmidt, Stefan, 2024, Revision of the Palaearctic species of Scopesis FÖRSTER (Hymenoptera, Ichneumonidae, Ctenopelmatinae), Linzer biologische Beiträge 56 (1), pp. 201-252 : 213-214

Scopesis longigena ( THOMSON, 1894) , stat. rev. (figs 6, 40, 59, 79)

Original: Mesoleius longigena THOMSON, 1894: 2031 , ♀ ♁, synonymized with Sc. bicolor by SCHMIEDEKNECHT (1914: 2930).

Lectotype: (♀) Ostricourt (Lund), designated and examined by HORSTMANN (2006: 81).

D e s c r i p t i o n: ♀. Body length 9.0 mm. Flagellum with 38 segments; 1 st flagellar segment 4.7× as long as wide and 2.1-2.2× as long as 2 nd segment; 2 nd segment 2.0–2.2×,

3 rd segment 1.8–2.0× and preapical segment 1.3× as long as wide. Temple moderately and roundly narrowed behind eye. OED 1.7× ocellar diameter. Clypeus slightly convex, not bulging medially, with sparse punctures, laterally without apical extensions. Ventral mandibular tooth slightly larger than dorsal tooth. MI 0.5.

Mesopleuron granulate and ± distinctly punctate ventrally, with fine striae dorsally. Speculum with microsculpture, shining. Area superomedia with weak lateral carina. Area petiolaris with complete carina. Hind femur 4.6× as long as wide. 1 st tergite 1.5–1.6× as long as wide, without latero-median carina. 2 nd tergite 1.4–1.5× as wide as long.

Color: black. Flagellum reddish ventrally, blackish basally, brownish dorsally. Palps brownish, mandible brownish or reddish. Apical 1/2 of clypeus reddish. Tegula brown. 1 st to 4 th tergites red, sometimes 1 st tergite ± black. Coxae, trochanters and trochantelli black; legs red; hind femur entirely black; hind tibia reddish-yellow, infuscate in apical 0.4; hind tarsomeres black. Pterostigma ochreous or yellowish.

♁. Body length 7.5 mm. Flagellum with 37 segments; 1 st flagellar segment 4.8× as long as wide and 1.8× as long as 2 nd flagellomere; 2 nd segment 2.6× as long as wide. Temple distinctly roundly narrowed. OED 1.5×. Clypeus transversely convex and slightly bulging medially, with coarse punctures, granulate. Ventral mandibular tooth slightly larger than dorsal tooth. MI 0.5.

Mesopleuron distinctly striate dorsally, with very superficial punctures, granulate but rather distinctly shining; speculum with microsculpture, shining. Area superomedia with weak lateral carina, sides slightly divergent apically. Area petiolaris with incomplete carina medially. Hind femur 4.6× as long as wide. 1 st tergite 2.2× as long as wide, without latero-median carina. 2 nd tergite 1.1× as wide as long

Color: black. Flagellum ochreous ventrally, brown dorsally. Palps, mandible except teeth, clypeus, face and scape ventrally yellow. Tegula black. 1 st tergite black, narrowly red apically; 2 nd to 4 th tergites red. Coxae, trochanters, trochantelli, mid femur basally and hind femur black. Hind tibia yellowish, infuscate in apical 0.4. Hind tarsus black. Pterostigma ochreous.

Host: Tenthredo notha KLUG, 1817 (Hym. Tenthredinidae ) (ZSM).

D i s t r i b u t i o n: Western Palaearctic, studied material from Germany and Sweden.

Taxonomical remarks: This species is closely related to Sc. bicolor (GRAVENHORST) and was synonymized with Sc. bicolor by SCHMIEDEKNECHT (1914). As already mentioned by HORSTMANN (2006), it differs by its stouter flagellum and slightly weaker structure of mesopleuron. Due to its rather short basal flagellomeres, it is not impossible that this species represents a variety of Sc. frontator (THUNBERG) or Sc. macropus (THOMSON) with black hind femur, but further genomic studies are necessary to solve this question.