Anisobas himalayanus, 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 : 626-627

Anisobas himalayanus nov.sp. ( figs 1 , 3-7 )

H o l o t y p e: (♁) Bhutan: Thimphu, Lungtenphu, Alt. 2300 m, 24-vi-1996, Leg. F.J. Feijen

(Leiden). D e s c r i p t i o n: ♁: Body length 8.4 mm. Flagellum with 28 flagellomeres; 1st

flagellomere 2.8× longer than wide. Tyloids on flagellomeres 6-17, long-oval, maximally 0.9× as long as their flagellomere. Temple dorsally 0.9× as wide as eye, parallel behind eye and moderately narrowed apically. Distance between lateral ocellus and eye 1.4× and between lateral ocelli 1.6× ocellar diameter. Frons smooth ventrally, with dense punctures dorsally. Face and clypeus not separated; face densely punctate, clypeus with sparse punctures apically. Clypeus almost flat; apical margin sharp and slightly concave, with very weak tubercle medially. Malar space 1.0× as long as width of mandibular base. Mandible strong; lower tooth slightly smaller than upper one. Genal carina reaching mandibular base.

Mesosoma covered with greyish setae. Side of pronotum with dense punctures and some coarse rugae at caudal margin, collar with strong lamelliform median longitudinal keel. Notaulus indistinct. Mesoscutum with dense punctures, finely granulate but shining. Mesopleuron and metapleuron with dense coarse punctures; speculum partly smooth. Epicnemial carina low, its dorsal end reaching frontal margin of mesopleuron. Juxtacoxal carina present. Scutellum moderately elevated, 1.2× wider than long, with sparse punctures, without lateral carina. Propodeum completely carinate, without apophysis. Area basalis short, slightly bulging forward medially. Area superomedia reniform, 2.0× wider than long; anterior transverse carina in its middle. Area petiolaris with fine rugae and lateral carina. Hind femur 3.9× longer than wide, densely punctate; hind tibia with about eight denticular spurs externally. Claws not pectinate. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 5× their diameter; vein 2m-cu slightly distad its middle. Vein 1cu-a interstitial.

Petiolus as high as wide. Postpetiolus moderately widened, with latero-median carina in basal half; median field slightly elevated, with sparse punctures and microsculpture; lateral field densely punctate. Gastrocoelus strongly impressed, with oblique ridges. Thyridium almost transverse, 0.8× as wide as the interval between thyridia. 2 nd tergite 1.3× wider than long; 3 rd tergite 1.9× wider than long. 2 nd to 4 th tergites densely and coarsely punctate, shining.

Color: black. Antenna black, scape reddish ventrally. Mandible medially and some suffusion of clypeus reddish. Clypeus with two ivory spots basally. Inner orbit up to anterior ocellus and vertex with ivory stripes. Upper margin of pronotum, subtegular ridge and scutellum ivory. Postpetiolus, 2 nd and 3 rd tergites red. 5 th to 7 th tergites with wide apical ivory bands. Coxae and trochanters black; legs otherwise red; hind femur black in apical 0.1; hind tibia blackish in apical 0.3; hind tarsus black. Wings hyaline; pterostigma brown.

♀ unknown.

R e m a r k: This new species runs to A. cornutus HEINRICH in the key of Oriental Anisobas species (see HEINRICH 1975: 462-463). It differs by its red 3 rd tergite, different color pattern of the mesosoma and lack of the frontal horn. The species Anisobas cornutus is only known from one ♀, and it is not impossible that this specimen from Bhutan represents the unknown ♁ of that species showing a sexually dimorphic absence of the frontal horn.

Figures

Figs 1-2: Habitus from lateral: (1) Anisobas himalayanus nov.sp. ♁: (2) Anisobas vietnamensis nov.sp. ♀.

Figs 3-7: Anisobas himalayanus nov.sp. ♁: (3) face, (4) head from dorsal, (5) propodeum, (6) basal tergites, (7) metasoma.