Scopesis bicolor ( GRAVENHORST , 1829)

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 : 207-208

Scopesis bicolor ( GRAVENHORST, 1829) (figs 1, 20, 36, 54, 74, 103)

Original: Tryphon bicolor GRAVENHORST, 1829 II : 326, ♀.

Holotype: (♀) (Wroclaw), type examined.

syn. Mesoleius praecatorius HOLMGREN, 1876: 48, ♀, synonymized by TEUNISSEN (1945: 220), type not examined. D e s c r i p t i o n: ♀. Body length 8.0–10.0 mm. Flagellum with 41–42 segments; 1st

flagellar segment 5.0–5.3× as long as wide and 1.9× as long as 2 nd segment; 2 nd segment 2.5–2.7×, 3 rd segment 2.3–2.4× and preapical segment 1.5× as long as wide. Temple moderately and roundly narrowed behind eye. OED 1.3× ocellar diameter. Face granulated, at most with some sparse fine and superficial punctures. Clypeus slightly convex, not bulging medially, with sparse rather coarse punctures, shining; apical margin almost straight, with small flat extensions laterally. Ventral mandibular tooth slightly larger than dorsal tooth.

Mesoscutum granulate, dull. Notaulus not distinctly impressed. Mesopleuron granulate or finely rugose or partly striate ventrally, with rather strong striae reaching frontal margin of mesopleuron dorsally. Speculum finely granulate, rather dull. Area superomedia sometimes with weak incomplete lateral carina. Area petiolaris usually with complete carina. Lateral longitudinal carina of propodeum sometimes weak or partly obsolete, pleural carina distinct and complete. Hind femur 4.5–4.7× as long as wide. Inner apical spur of hind tibia 0.62× as long as hind metatarsus. Vein 2rs-m 0.65–0.85× as long as vein M between 2rs-m and 2m-cu. Vein 1cu-a interstitial or postfurcal by 1–2× its width. Nervellus of hind wing slightly inclivous, intercepted in its apical 0.7–0.8. 1 st tergite 1.4– 1.6× as long as wide, without latero-median carina. 2 nd tergite 1.2–1.4× as wide as long.

Color: black. Flagellum reddish ventrally, brownish dorsally, black basally. Palps partly, spot on mandible, apical 2/3 of clypeus reddish. Tegula black or yellow. 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 black basally and in apical 0.25; hind tarsomeres black, with paler bases. Pterostigma ochreous.

The ♀♀ have two color patterns: a) tegula yellow: mid trochanter and mid and hind trochantelli with yellow spots; b) tegula black: all trochanters and trochantelli black.

♁. Body length 7.5-10.0 mm. Flagellum with 40–44 segments; 1 st flagellar segment 5.2– 5.7× as long as wide and 1.9–2.0× as long as 2 nd segment; 2 nd segment 2.5–2.9× and 3 rd segment 2.3–2.6× as long as wide. Temple moderately and roundly narrowed behind eye. OED 1.4× ocellar diameter. MI 0.3. Clypeus moderately convex, not bulging. Mesoscutum with fine granulation, often ± shining. Mesopleuron granulate or finely rugose or partly striate ventrally, with rather strong striae dorsally. Speculum finely granulate, rather dull. Mesopleuron granulate or finely rugose or partly striate ventrally, with rather strong striae reaching frontal margin of mesopleuron dorsally. Speculum finely granulate, rather dull. Hind femur 4.5× as long as wide. Inner apical spur of hind tibia 0.59× as long as hind metatarsus. 1 st tergite 1.8–2.2× as long as wide. 2 nd tergite 0.9–1.1× as long as wide.

Color: black. Palps, mandible except teeth, clypeus, face, ventral spot at scape, often tegula tegula, subtegular ridge, sometimes apical spot of fore coxa, fore and mid trochanters partly and all trochantelli ± yellow (hind trochantellus sometimes black). 1 st tergite usually black. 2 nd to 4 th tergites red. Hind tibia yellowish, infuscate in apical 0.4.

Host: Tenthredopsis spec. (Hym. Tenthredinidae ) ( ZSM).

D i s t r i b u t i o n: West Palaearctic, studied material from Bulgaria, Germany, Italy, Spain, Switzerland, and United Kingdom.

T a x o n o m i c a l r e m a r k: We have seen a ♁ from Kamchatka determined as bicolor ( ROMAN 1931) . It belongs to Scopesis sachalinensis (UCHIDA) . Sc. bicolor has not been found in the Eastern Palaearctic region so far.