Benyllus sundaensis, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 31

Benyllus sundaensis nov. sp.

( Figs 11A–D )

Holotype. (♀) Indonesia: Sumbawa , nr Pancasila, Gn. Tambora, Mal. trap 4, c 1090 m, 22.ix.–2.x.1993, C. van Achterberg, RMNH´93 (Leiden).

Paratype. (♀) Indonesia: Sumbawa , nr Pancasila, Gn. Tambora, Mal. trap 8, c 500 m, 27.ix.–2.x.1993, C. van Achterberg, RMNH´93 (Leiden) .

Description. ♀. Body length 7.0–8.0 mm.

Head. Flagellum with 36–38 flagellomeres, slightly lanceolate; 1 st flagellomere 3.6–3.7 × longer than wide, about 12 th flagellomere square, widest flagellomeres 1.4 × wider than long. Temple very short, strongly and roundly narrowed behind eye. OED 0.9 × and OOD 0.9 × ocellar diameter. Frons finely rugose, with some superficial punctures. Face densely punctate, shining, weakly impressed above anterior tentorial pits, latero-ventrally slightly swollen. Clypeus almost flat, with sparse punctures; apical margin sharp and slightly concave (fig. 11A). Mandible long and distinctly narrowed behind base, with two teeth, ventral tooth smaller than dorsal tooth. Malar space 0.9 × as long as width of mandibular base. Gena with sparse fine punctures. Genal carina reaching hypostomal carina close to mandibular base.

Mesosoma . Notaulus indistinct. Mesoscutum finely and densely rugose-punctate, dull. Mesopleuron and metapleuron with fine dense striated punctuation; speculum partly smooth; juxtacoxal carina present (fig. 11B). Scutellum slightly elevated, about as long as wide, with dense punctures and complete lateral carina. Propodeum completely carinated, with distinct apophysis (fig. 11C); spiracle slit-shaped.Area superomedia heart-shaped, about as long as wide; costula reaching at apical 0.7 of its length. Hind coxa with fine dense punctures, without scopa. Hind femur densely punctate, 4.4–4.5 × longer than wide. Claws simple. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 4–5 × their diameter; vein 2m-cu distad its middle. Vein 1cu-a slightly antefurcal by 1.0 × its width.

Metasoma (fig. 11D). Oxypygous. Petiole about as wide as high. Postpetiole slightly widened, without latero-median carina, densely punctate; median field not separated. Gastrocoelus very small, indicated as longitudinal ridge. Thyridium very small, pit-shaped. 2 nd tergite 1.1 × wider than long, finely and densely rugose-punctate, surface ± smoothened in apical 1/4. 3 rd tergite with fine punctures in basal half, with very superficial punctures apically. Ovipositor sheath narrow, reaching widely behind metasomal apex by length of 7 th tergite.

Colour. Black. Flagellomeres 5–14 ivory dorsally. Palps, base of mandible, sometimes side of clypeus, facial and frontal orbits up to vertex, gena and outer orbit, frontal margin and hind edge of pronotum, tegula, subtegular ridge, spot on ventral mesopleuron, scutellum and postscutellum, apical spot on metapleuron confluent with spot around apophysis, triangular spots on postpetiole and 2 nd to 3 rd (in HT) or 4 th (in PT) tergites, narrow apical margins of 4 th and 5 th tergites and apical spots on 6 th and 7 th tergites ivory (fig. 11D). Legs mainly red; fore and mid coxae with dorsal ivory spots; hind leg entirely red in HT; hind tibia blackish with reddish base and hind tarsus black in PT. Wings hyaline; pterostigma dark brown.

♂ unknown.

Remarks. This species differs from Benyllus satageus (Tosquinet) from Java by its red or black hind tarsus (ivory in B. satageus ) and ivory posterolateral spots on 3 rd tergite (black in B. satageus ). It might represent a subspecies of B. satageus .

Distribution. Only known from Sumbawa.

Figures

FIGURE 11. Benyllus sundaensis n. sp. HT ♀. A face, frontal view, B mesosoma, lateral view, C propodeum, dorsal view, D metasoma, dorsal view.