Amblysmenus nigriventris, Riedel, 2021

Riedel, Matthias, 2021, A New Contribution to the Knowledge of the East Palaearctic Ichneumoninae (Hymenoptera, Ichneumonidae), Linzer biologische Beiträge 53 (1), pp. 171-240 : 182

Amblysmenus nigriventris nov.sp. (figs 36-39)

H o l o t y p e: (♀) " Uzbekistan sept., Yangiabad, 41,2N 70,1E, 12 km N Angren, leg. K. Denes 8- 10.5.94" (Linz).

D e s c r i p t i o n: ♀: Body length 15.5 mm. Flagellum bristle-shaped, with 42 flagellomeres; 1 st flagellomere 3.5× longer than wide and 0.56× as long as eye; all flagellomeres longer than wide. Head covered with pale brownish hairs. Temple long, strongly and linearly narrowed behind eyes. OED 1.9× ocellar diameter. Frons and face rugose-punctate, dull. Clypeus large, moderately convex, 1.6× wider than long, coarsely punctate, shining. Mandible narrow, lower tooth slightly smaller than upper tooth and moderately turned inwards (c. 45°). Malar space very long, MI 1.7. Genal carina straight ventrally, reaching hypostomal carina far from mandibular base; hypostomal and genal carinae low.

Mesosoma covered with pale brownish hairs. Notaulus impressed in anterior third of mesoscutum. Mesoscutum densely punctate and granulate, dull. Mesopleuron and metapleuron coarsely and densely punctate; juxtacoxal carina absent. Scutellum distinctly and roundly elevated, about as long as wide, with fine punctures, lateral carina in anterior 0.2. Propodeal spiracle slit-shaped. Area basalis without median tubercle. Area superomedia hexagonal, c. 2.0× wider than long, rugose. Anterior transversal carina indistinct. Posterior transversal carina with strong dentiform apophyses (about as long as its basal width). Hind coxa densely punctate, without scopa. Hind femur densely punctate, 4.8× longer than wide. Claws not pectinate. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 5× their width; vein 2m-cu in the middle. Vein 1cu-a postfurcal by 2× its width.

Metasoma stout, amblypygous: hypopygium long, c. 2× longer than the visible part of ovipositor sheath. Petiolus slightly wider than high. Postpetiolus strongly widened, with distinct dorsal carina; lateral field 0.5× as wide as median field, rugose; median field finely rugose, strongly shining. Gastrocoelus slightly impressed, with strong ridges. Thyridium small, almost transverse, 0.4x as wide as the interval. 2 nd tergite 1.7× wider than long, 2 nd and 3 rd tergites densely rugose-punctate, apical margin of 3 rd tergite with scattered punctures. 4 th tergite with superficial punctures. 2 nd to 4 th sternites with median folds. Ovipositor sheath not reaching behind metasomal apex.

Color: black. Coxae and trochanters black; femora, tibiae and tarsi reddish; hind tibia black, reddish in basal 0.2; hind tarsus black. Wings distinctly infuscate; pterostigma reddish.

♁ unknown.

R e m a r k: This new species differs from typical members of the genus Hoplismenus GRAVENHORST by its amblypygous metasoma. It resembles the type species of Amblysmenus HEINRICH , A. spinosus HEINRICH, 1975 , from Myanmar, but can be separated by its entirely black body. The genus Amblysmenus has not been reported from the Palaearctic region before.