Coelichneumon (Exephanides) nigropropodealis, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 45

Coelichneumon (Exephanides) nigropropodealis nov. sp.

( Figs 18A–C )

Holotype. (♀) Malaysia: SW Sabah, nr. Long Pa Sia (East), 25.xi.–7.xii.1987, c. 1000 m, Mal. trap 5, C. van Achterberg, RMNH´87 (Leiden).

Description. ♀. Body length 15.3 mm.

Head. Flagellum with 37 flagellomeres, distinctly lanceolate; 1 st flagellomere 2.4 × longer than wide, about 11 th flagellomere square, widest flagellomeres 1.9 × wider than long. Temple rather short, distinctly and linearly narrowed behind eye, dorsally 0.5 × as long as eye. OED 1.4 × and OOD 1.0 × ocellar diameter. Frons almost smooth, shining. Face and clypeus rather densely punctate (fig. 18A). Malar space 0.7 × as long as width of mandibular base. Gena in profile 0.8 × as wide as eye, with sparse punctures. Genal carina reaching hypostomal carina, both carinae low.

Mesosoma . Side of pronotum punctate dorsally, with coarse striae ventrally. Notaulus impressed in frontal 1/5 of mesoscutum. Mesoscutum coarsely and densely punctate, finely granulate, posterior margin with sparse punctures. Mesopleuron densely punctate, partly rugose, speculum smooth. Metapleuron coarsely rugose-punctate; juxtacoxal carina present. Scutellum slightly elevated, slightly wider than long, with rather dense punctures, without lateral carina. Area basalis and area superomedia confluent; area superomedia slightly wider than long (fig. 18B); costula reaching at apical 0.7 of its length. Hind coxa with dense punctures and small low pale scopa ventro-apically. Hind femur densely punctate, 3.9 × longer than wide. Tarsi moderately widened, 3 rd mid tarsomere 1.2 × longer than apically wide. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 3.0 × their diameter. Vein 1cu-a postfurcal by 2.0 × its width.

Metasoma. Oxypygous and rather slender. Postpetiole strongly widened, median field moderately elevated, with fine aciculation and some coarse punctures; lateral field 0.8 × as wide as median field, with coarse punctures. 2 nd tergite 1.1 × wider than long. Gastrocoelus strongly impressed and with ridges. Thyridium almost transverse, 1.0 × as wide as the interval between thyridia. 2 nd and 3 rd tergites coarsely rugose-punctate, with strong median striae (fig. 18C). 4 th tergite with superficial punctures and fine striae in basal third. Following tergites almost smooth. Ovipositor sheath slightly extending behind metasomal apex by 0.5 × length of 7 th tergite.

Colour. Black. Ivory are rings of flagellomeres 4–18, palps, base of mandible, clypeus, face except roundish central black spot, complete orbit except narrow interruption at lateral ocellus, ventral spot of scape, collar and upper margin of pronotum, spot of tegula, subtegular ridge, wide stripe on ventral mesopleuron, side of scutellum, posterolateral spots of 1 st to 3 rd tergites, narrow apical margins of 2 nd and 3 rd tergite, and apical bands on 4 th to 7 th tergites. Legs reddish; fore and mid coxae, all trochanters and small ventral and dorsal spots on hind coxa ivory. Frontal stripes of fore and mid tibiae and all tarsi ivory. Hind femur red, black in apical 0.4; hind tibia black, with wide subbasal ivory ring. Wings hyaline, pterostigma black.

♂ unknown.

Remarks. This new species belongs to the subgenus Exephanides and resembles Coelichneumon (Exephanides) pseudoneotypus Riedel, 2013 from India. It differs by stouter tarsomeres, slenderer hind femur, stouter metasoma, ivory fore and mid tarsi and slightly different colour patterns of face and tergites.

Distribution. Only known from Borneo.

Figures

FIGURE 18. Coelichneumon (Exephanides) nigropropodealis n. sp. HT ♀. A face, frontal view, B propodeum, dorsal view, C basal tergites, dorsal view.