Listrodromus rufiventris, Riedel, 2023

Riedel, Matthias, 2023, New contribution to the Oriental species of Anisobas WESMAEL and Listrodromus WESMAEL (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 54 (2), pp. 625-639 : 630-631

Listrodromus rufiventris nov.sp. (figs 17, 22, 24, 29)

H o l o t y p e: (♀) Indonesia: C Sulawesi, nr Luwuk, Bunga, c 300 m, 1-14.xi.1989, Mal. trap 16, C. v. Achterberg, RMNH´89 (Leiden).

D e s c r i p t i o n: ♀. Body length 7.2 mm. Length of fore wing 6.8 mm. Flagellum short, filiform, with 22 flagellomeres; 1 st flagellomere (without anellus) 2.2× as long as wide and 0.8× as long as 2 nd flagellomere; 2 nd flagellomere 2.6× longer than wide; all flagellomeres longer than wide. Temple shortly parallel behind eye, moderately narrowed apically. Distance between lateral ocellus and compound eye 1.5× ocellar diameter. Vertex, occiput and temple almost smooth. Frons, malar space and gena with sparse punctures. Face densely punctate, covered with whitish setae. Clypeus with sparse punctures, apical margin with large median tooth. Mandible with two large teeth, lower tooth smaller and slightly curved inwards. Malar space 1.3× longer than width of mandibular base. Genal carina reaching mandibular base.

Mesosoma shining, with whitish setae. Pronotum largely smooth, with some fine setiferous punctures; upper margin thickened and with sparse larger punctures. Notaulus weakly impressed on frontal margin of mesoscutum. Mesoscutum with dense punctures in frontal half, almost smooth in posterior third. Mesopleuron densely punctate; speculum very large and smooth. Metapleuron with rather dense punctures dorsally but almost smooth ventrally; juxtacoxal carina strong. Scutellum moderately elevated, transverse, with complete lateral carina and sparse fine punctures. Propodeum completely carinate, spiracle oval. Area externa and area superomedia almost smooth, area petiolaris with transverse rugae. Area superomedia heart-shaped, 1.25× wider than long; anterior transverse carina reaching at 7/10 of its length. Coxae densely punctate; hind coxa without scopa. Hind femur club-shaped, 3.4× longer than wide. All claws strongly pectinate. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 4-5× their width; vein 2m-cu reaching its middle. Vein 1cu-a interstitial.

Metasoma strongly amblypygous. Petiolus with latero-median carina. Postpetiolus moderately widened, without latero-median carina, almost smooth with fine longitudinal rugae. Gastrocoelus strongly impressed, with longitudinal ridges laterally and oblique ridges medially. Thyridium oblique, c. 0.8× as long as the interval between thyridia. 2 nd tergite about as long as wide; 3 rd tergite 1.4× wider than long. 2 nd and 3 rd tergites coarsely and densely punctate; 2 nd tergite with longitudinal rugose-punctuation medially; 3 rd tergite with reduced punctuation at apical margin. 4 th tergite with coarse but superficial punctures; following tergites almost smooth. Ovipositor sheath short, not reaching behind metasoma apex.

Color: Flagellum reddish-yellow. Head brownish. Palps ochreous. Mandible medially, face except short black dorso-median stripe, frontal orbit, scape, pedicel and spot on outer orbit ivory. Mesosoma brown. Upper margin of pronotum, tegula, subtegular ridge and scutellum ivory. Metasoma red; 2 nd and 3 rd tergites with weak posterolateral ivory spots. Fore and mid coxae and trochanters ivory; hind coxa with ivory dorsal spot; legs otherwise yellow. Wings hyaline; pterostigma ochreous.

♁ unknown.

D i s t r i b u t i o n: Only known from Sulawesi.