Allonotus rufus ssp. sumatraensis, Riedel, 2023

Riedel, Matthias, 2023, Contribution to the knowledge of the Ichneumoninae (Hymenoptera, Ichneumonidae) from Maritime Southeast Asia, Zootaxa 5363 (1), pp. 1-94 : 13

Allonotus rufus ssp. sumatraensis nov. ssp.

( Figs 4A–D )

Holotype. (♀) Indonesia: N Sumatra, Ketambe , c 400 m, near N.P. Gn. Leuser, Mal. trap, iv.1994, Y. van Nierop & C. van Achterberg, RMNH´95 (Leiden).

Paratype. (♀) Indonesia: N Sumatra, Ketambe , c 400 m, near N.P. Gn. Leuser, Mal. trap, viii.1994, Y. van Nierop & C. van Achterberg, RMNH´95 (Leiden) .

Description. ♀: Body length 12 mm.

Head. Flagellum with 40 flagellomeres, slender and almost bristle-shaped; 1 st flagellomere 4.8 × longer than wide, widest flagellomeres about square. Temple short, strongly and roundly narrowed behind eye (fig. 4B). OED 1.5 × and OOD 0.7 × ocellar diameter. Temple with fine dense punctures. Frons with microsculpture and fine sparse punctures. Face with sparse superficial punctures. Clypeus large, moderately swollen baso-medially, slightly concave centrally, with sparse punctures; apical margin sharp, slightly rounded (fig. 4A). Mandible sickle-shaped, ventral tooth slightly smaller than dorsal tooth and completely turned inwards. Malar space 0.7 × as long as width of mandibular base. Gena with fine rather dense punctures. Genal carina reaching mandibular base.

Mesosoma . Notaulus impressed in frontal 0.4 of mesoscutum. Mesoscutum finely rugose-punctate, dull. Mesopleuron and metapleuron with fine superficial punctures, shining. Juxtacoxal carina present. Scutellum moderately elevated, longer than wide, with complete lateral carina. Propodeum completely carinated (fig. 4C), with blunt short apophysis. Area basalis with median ridge. Area superomedia hexagonal, 1.5 × longer than wide, sometimes with median ridge; costula reaching at 3/10 of its length. Legs slender. Hind coxa densely finely punctate and pilose, without distinct scopa. Hind femur 4.1–4.5 × longer than wide. Claws simple.Areolet pentagonal; frontal distance of veins 2rs-m and 3rs-m 1.0–2.0 × their width. Vein 1cu-a interstitial or postfurcal by 1.0 × its width.

Metasoma. Slender, oxypygous. Postpetiole slightly widened, with some fine sparse punctures; median field not separated. Gastrocoelus indicated by some longitudinal ridges. Thyridium transverse, separated from basal margin of 2 nd tergite by c 2 × its length, 1.4–1.7 × wider than the interval between thyridia (fig. 4D). 2 nd tergite 1.7–1.8 × longer than wide. All tergites very finely rugose-punctate and dull; 2 nd tergite rugose basally. Ovipositor sheath long and slender, reaching behind metasomal apex by length of 7 th tergite.

Colour. Red. Scape black dorsally, red ventrally; flagellum black, flagellomeres 8–15 ivory dorsally. Frons dorsally and temple frontally blackish. Petiole black, postpetiole reddish in apical half. Tergites blackish; 2 nd and 3 rd tergites with apical yellowish bands; 6 th and 7 th tergites with large ivory median spots. Legs red; fore and mid tarsi ± black; hind femur black, narrowly red basally; hind tibia and tarsus black. Wings slightly yellowish; pterostigma brown.

♂ unknown.

Remarks. This subspecies differs from Allonotus rufus rufus Cameron, 1907 from Borneo by its entirely red fore and mid femora and the mainly black hind femur.

Distribution. This subspecies is only known from Sumatra.

Figures

FIGURE 4. Allonotus rufus sumatraensis n. ssp. HT ♀. A face, frontal view, B head, dorsal view, C propodeum, dorsal view, D basal tergites, dorsal view.