Virgichneumon dumeticola (GRAVENHORST, 1829)

Riedel, Matthias, 2024, The genus Virgichneumon HEINRICH in the West Palaearctic region (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 56 (1), pp. 149-199 : 162-163

Virgichneumon dumeticola (GRAVENHORST, 1829) (figs 5, 27, 47, 65, 98)

Holotype: (♁) (Wroclaw), studied and comb. nov. by RASNITSYN (1981).

D e s c r i p t i o n: ♀. Body length 8.5-10.0 mm. Flagellum with 34-38 segments, slightly lanceolate; 1 st flagellar segment 2.1-2.2× as long as wide; 9 th or 10 th segment square; widest segments 1.2-1.3× as wide as long. Temple slightly to moderately and roundly narrowed behind eye (fig. 5). OED 1.0-1.2× and OOD 1.5-1.6× ocellar diameter. Gena 1.0-1.1× as wide as eye, with dense punctures ventrally. MI 0.9-1.1. Hypostomal carina low or slightly elevated.

Mesopleuron including speculum densely rugose-punctate, partly striate; metapleuron with very coarse rugose-punctation. Epicnemial carina low behind fore coxa. Scutellum wider than long, with sparse punctures. Area superomedia heart-shaped, about as long as wide; slightly posterior to its middle with costula (fig. 27). Hind coxa with dense punctures and rather dense setae, without or with weak scopa. Hind femur 3.9-4.1× as long as wide, densely punctate. External surface of hind tibia without or with few (1-2) denticular spines. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 1- 2× their width; vein 2m-cu reaching distad its middle. Vein 1cu-a postfurcal by 1-2× its width.

Postpetiole with median field of postpetiole elevated, densely punctate; latero-median carina indistinct. Gastrocoelus impressed, with some ridges. Thyridium transverse, 0.4- 0.5× as wide as interval between thyridia (fig. 47). 2 nd tergite 1.3× as wide as long. 2 nd and 3 rd tergites with fine and very dense rugose-punctation, ± dull; following tergites shining. Ovipositor sheath reaching beyond metasomal apex by length of 7 th tergite.

Color: black. Setae of mesoscutum brownish. Flagellar segments 7/8-14/15 dorsally, frontal orbit dorsally, scutellum, wide apical stripe of 6 th tergite and 7 th tergite largely ivory. Side of clypeus sometimes yellowish. 2 nd tergite often with narrow reddish hind margin. Pterostigma blackish.

♁. Body length 9-10 mm. Flagellum with 34-37 segments. Tyloids short-oval, on flagellar segments 5/7-14/18, maximally as long as their segments (fig. 98). MI 0.6. Fore metatarsus without apical tooth. Hind femur 3.7-3.8× as long as wide. 2 nd tergite 1.1× as long as wide.

Color: black. Clypeus laterally, inner orbit up to lateral ocellus (fig. 65), collar and hind edge or upper margin of pronotum, often spot on tegula, subtegular ridge and apical 2/3 of scutellum, sometimes spot on postscutellum and spots on fore and mid coxae ivory. Flagellum often ochreous ventrally. Legs black; fore and mid femora apically and fore and mid tibiae and tarsi mainly yellowish-brown; sometimes hind femur with chestnut-brown suffusion; hind tibia usually with ivory or yellowish basal spot. Pterostigma brown.

T a x o n o m i c a l r e m a r k s: For a differentiation of ♁♁ of Virgichneumon dumeticola and V. digrammmus (with black hind femora) see the remarks under V. digrammus .

S t u d i e d m a t e r i a l: from Austria, Bulgaria, Georgia, Germany, Italy, Russia, Sweden, Turkey.