Setanta albimaculata, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 81-83

Setanta albimaculata nov. sp.

( Figs 36A–D )

Holotype. (♀) Indonesia: N Sumatra, Ketambe , 400 m, Mal. trap, near edge rainforest, iii.1995, Y. van Nierop & C. van Achterberg, RMNH´99 (Leiden).

Etymology. The species name refers to the ivory colour pattern.

Description. ♀. Body length 10.2 mm.

Head. Flagellum with 37 flagellomeres, almost filiform; 1 st flagellomere 4.5 × longer than wide, widest flagellomeres about as long as wide, distal flagellomere blunt. Temple rather long, moderately and roundly narrowed behind eye. OED 1.0 × and OOD 1.2 × ocellar diameter. Frons densely punctate dorsally. Face densely punctate, shining. Clypeus almost flat, wide, 3.1 × wider than long, densely punctate; apical margin sharp, slightly bilobed (fig. 36A). Mandible long and slender, dorsal tooth pointed, ventral tooth very small and blunt. Malar space 0.6 × as long as width of mandibular base. Gena with dense punctures. Genal carina reaching hypostomal carina away from mandibular base.

Mesosoma . Notaulus slightly impressed at frontal margin of mesoscutum. Mesoscutum very densely punctate, slightly shining.Mesopleuron finely rugose-punctate, partly with longitudinal rugae; speculum punctate.Metapleuron rugose-punctate; juxtacoxal carina absent. Scutellum slightly elevated, about as long as wide, with dense punctures; without lateral carina. Propodeum coarsely rugose-punctate, with very blunt short apophysis (fig. 36C); spiracle slit-shaped. Area basalis trapezoid, wider than long, without median tubercle. Area superomedia rectangular, 1.1 × longer than wide; costula absent. Area petiolaris with transverse rugae. Hind coxa densely punctate, without scopa. Hind femur slender, densely punctate, 5.3 × longer than wide. Claws simple. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 4.0 × their diameter. Vein 1cu-a postfurcal by 3.0 × its width.

Metasoma. Amblypygous; hypopygium with an apical brush of fine but elongate setae, not reaching metasomal apex (fig. 36B). 2 nd and 3 rd sternites with median folds. Postpetiole moderately widened, without latero-median carina; median field moderately elevated and separated, finely punctate and weakly striate; lateral field striate. Gastrocoelus triangularly impressed, confluent medially, without multiple longitudinal ridges. Thyridium small, oblique, 0.4 × as wide as the interval between thyridia (fig. 36D). 2 nd tergite as long as wide. 2 nd and 3 rd tergites densely rugose-punctate, dull; 2 nd tergite with longitudinal ridges basally. Following tergites finely punctate, shining. Ovipositor sheath not reaching behind metasomal apex.

Colour. Black. Ivory are rings on flagellomeres 8–15, palps, mandible except teeth, clypeus face except ventral brownish spot, narrow stripes of frontal orbit, gena, scape ventrally, collar, apical half of upper margin of pronotum, spot on tegula, subtegular ridge, apical spot of scutellum, postscutellum, upper division of metapleuron, posterolateral spot of propodeum around apophysis, posterolateral spot of postpetiole, wide posterolateral stripes and narrow apical margins of all tergites. Legs reddish-yellow; fore and mid coxae and trochanters and dorsal spot of hind coxa ivory; fore and mid femora with infuscate dorsal stripes; hind femur except reddish base blackish; mid tibia in apical 0.3 and hind tibia basally and in apical 0.3 black; hind tarsus ivory, 4 th and 5 th hind tarsomeres black. Wings hyaline; pterostigma dark brown.

♂ unknown.

Remarks. The generical position of this new ♀ is somewhat questionable, since the associated ♂ is unknown. The habitus and the morphology of clypeus and gastrocoelus resemble members of the genus Setanta Cameron , but the form of mandible and the brush of setae of apical hypopygium would be more characteristic for Eutanyacra Cameron. I provisionally include this ♀ in the genus Setanta here.

In the key of Oriental Setanta species ( Heinrich 1974a: 439–440), this species runs to Setanta albitarsis Heinrich, 1974 but differs by black mesoscutum and mesopleuron without ivory coloration and the mainly black hind femur.

Distribution. Only known from Sumatra.

Figures

FIGURE 36. Setanta albimaculata n. sp. HT ♀. A face, frontal view, B metasomal apex, lateral view, C propodeum, dorsal view, D basal tergites, dorsal view.