Stirexephanes albicoxis, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 84-86

Stirexephanes albicoxis nov. sp.

( Figs 37A–D )

Holotype. (♀) Malaysia: SE Sabah, nr. Danum Valley Field C, c 150 m, WONO, Mal. trap 5, 19.iv.–22.v.1988, RMNH´89, C. van Achterberg & T. Burghouts (Leiden).

Etymology. The species name refers to the completely ivory coxae.

Description. ♀. Body length 11.0 mm.

Head. Flagellum with 32 flagellomeres, slightly lanceolate; 1 st flagellomere 3.4 × longer than wide, 9 th flagellomere square, widest flagellomeres 1.3 × wider than long, apical flagellomere blunt. Temple very short, strongly and linearly narrowed behind eye. OED 1.1 × and OOD 0.9 × ocellar diameter. Frons shining, finely granulate and with superficial punctures dorsally. Face rather densely but superficially punctate, shining. Clypeus large, almost flat, with sparse punctures; apical margin blunt and slightly rounded (fig. 37A). Mandible long and rather slender, with two teeth; ventral tooth much smaller and slightly bent inwards. Malar space 0.8 × as long as width of mandibular base. Gena with sparse fine punctures. Genal carina reaching hypostomal carina away from mandibular base.

Mesosoma . Notaulus distinctly impressed in frontal third of mesoscutum. Mesoscutum finely and densely punctate, dull. Mesopleuron with dense superficial punctures, with some coarse longitudinal rugae ventrally; speculum superficially punctate (fig. 37B). Metapleuron punctate and finely striate; juxtacoxal carina present. Scutellum slightly elevated and laterally carinate in basal 0.8, slightly longer than wide, with rather dense punctures. Propodeum completely carinated, with blunt short apophysis (fig. 37C); spiracle slit-shaped. Area basalis trapezoid, about as wide as long, without median tubercle. Area superomedia horseshoe-shaped, 1.3 × longer than wide; costula reaching at basal 0.35 of its length. Hind coxa with fine dense punctures, without scopa; hind femur densely punctate, 4.8 × longer than wide. Claws simple, strongly bent apically. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 1–2 × their diameter. Vein 1cu-a interstitial.

Metasoma. Oxypygous. Petiole about as wide as high. Postpetiole slightly widened, without latero-median carina; median field not separated, finely granulate; lateral field punctate. Gastrocoelus small, much longer than wide, with fine ridges. Thyridium very small, oblique, 0.2 × as wide as the interval between thyridia (fig. 37D). 2 nd tergite 1.1 × longer than wide, entirely granulate and with fine dense punctures in basal half, dull. Following tergites finely granulate, slightly shining. 2 nd to 5 th sternites with median folds. Ovipositor sheath narrow, reaching widely behind metasomal apex by length of 7 th tergite.

Colour. Black. Flagellum black, flagellomeres 1–4 reddish-brown, flagellomeres 5–15 ivory dorsally. Palps, all coxae and trochanters and 6 th and 7 th tergites mainly ivory. Spot of mandible, lateral margin of clypeus, scape ventrally and two small apical spots of scutellum reddish. Fore and mid femora and fore tibia and tarsus yellow; mid tibia yellow, apically blackish; mid and hind tarsi black; hind femur black, narrowly red at base; hind tibia blackish, diffusely reddish-brown in basal half. 2 nd and 3 rd tergites with narrow reddish apical margins. Wings slightly infuscate; pterostigma reddish-brown.

♂ unknown.

Remarks. This new species differs from the known mainly black Oriental species of Stirexephanes by the completely ivory coxae and trochanters.

Distribution. Only known from Borneo.

Figures

FIGURE 37. Stirexephanes albicoxis n. sp. HT ♀. A face, frontal view, B mesosoma, lateral view, C propodeum, dorsal view, D metasoma, dorsal view.