Heresiarches simile, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 57-59

Heresiarches simile nov. sp.

( Figs 24A–C )

Holotype. (♀) Malaysia: SW Sabah, nr Long Pa Sia (West), c 1050 m, 1–14.iv.1987, Mal. trap 3, C. van Achterberg, RMNH´87 (Leiden).

Etymology. The species name refers to the similarity of this new species with the type species of this genus, Heresiarches eudoxius (Wesmael, 1845) .

Description. ♀. Body length 11 mm.

Head. Flagellum with 33 flagellomeres, almost filiform; 1 st flagellomere 5.0 × and 2 nd flagellomere 4.0 × longer than wide, widest flagellomeres slightly longer than wide. Temple short, strongly and roundly narrowed behind eye, dorsally 0.3 × as long as eye. OED 1.0 × and OOD 1.4 × ocellar diameter. Frons shining, with microsculpture and very sparse fine punctures. Face and clypeus with fine sparse punctures (fig. 24A). Malar space 0.8 × as long as width of mandibular base. Genal carina reaching hypostomal carina close to mandibular base.

Mesosoma . Notaulus indistinct. Mesoscutum with fine dense punctures and granulate, ± dull. Mesopleuron with dense punctures, shining; speculum large and smooth. Metapleuron densely punctate; juxtacoxal carina present. Scutellum moderately elevated, about as long as wide, with fine sparse punctures, with lateral carina in basal 0.8. Area basalis and area superomedia confluent, slightly elevated, smooth, frontal margin bulging towards postscutellum medially, without lateral carina (fig. 24B). Hind coxa with dense superficial punctures, without scopa. Hind femur 4.3 × longer than wide. Claws simple. Areolet pentagonal, frontal distance between veins 2rs-m and 3rsm 2.0 × their diameter. Distal part of vein Rs distinctly sinusoid. Vein 1cu-a postfurcal by 3.0 × its width. Nervellus of hind wing reclivous, intercepted in its apical 0.7.

Metasoma (fig. 24C). Strongly oxypygous. Postpetiole slightly widened, without latero-median carina, finely aciculate basally and smooth posteriorly; median field not separated. Gastrocoelus distinctly impressed, almost triangular, with strong ridges. Thyridium small, oblique, 0.5 × as wide as the interval between thyridia. 2 nd tergite 1.3 × wider than long, densely punctate and distinctly striate medially. 3 rd and 4 th tergites with superficial punctures, shining; following tergites almost smooth.

Colour. Black, tergites with brownish suffusion. Ivory are rings on flagellomeres 7–13, palps, lateral margin of clypeus, wide facial orbit (widened and almost confluent below antennal grooves) (fig. 24A), gena, complete orbit (except narrow interception at malar space), scape ventrally, frontal and upper margins of pronotum, apical spot of tegula, subtegular ridge, stripe of ventral mesopleuron, upper division of metapleuron, area posteroexterna of propodeum, posterolateral spots of 1 st to 3 rd tergites, narrow apical margins of 4 th and 5 th tergites, wide apical bands of 6 th and 7 th tergites (fig. 24C). Legs reddish; fore coxa entirely, mid coxa apically, dorsal spot of hind coxa and all trochanters ivory; hind trochantellus and hind femur brown, hind femur with narrow red spots basally; fore tibia with yellow stripe frontally; hind tibia yellow, infuscate in apical 0.3; mid tarsus brown; hind tarsus black. Wings hyaline; pterostigma brown.

♂ unknown.

Remarks. This new species is similar to the European Heresiarches eudoxius (Wesmael) and runs to this species in the key to known Heresiarches species ( Riedel 2013: 2061–2063). It differs mainly by a slenderer flagellum (1 st flagellomere 4.0 × longer than wide and widest flagellomere 1.2 × wider than long in H. eudoxius ) and might represent an Oriental subspecies of H. eudoxius .

Distribution. Only known from Borneo.

Figures

FIGURE 24. Heresiarches simile n. sp. HT ♀. A face, frontal view, B propodeum, dorsal view, C metasoma, dorsal view.