Acrotaphus monotaenius Pádua sp. n. (Figs 166–169) Diagnosis. This species can be distinguished from all other species of Acrotaphus by the combination of the following characters: 1) fore wing blackish with one yellowish band extending backwards from anterior margin, just proximal to the pterostigma to the encounter of cu-a to base of the Rs&M; 2) metasoma entirely black; 3) female with tarsal claw with basal lobe longitudinally elongated, with claw apex clearly overtaking the posterior margin of lobe; 4) posterior ocelli separated from eyes by 0.35× its diameter in dorsal view. Description. Female. Body [12.0] mm. Head. Lower face [0.8]× as broad as high (from supraclypeal suture to base of antenna), flat, with scattered punctures which bear long conspicuous bristles; head in dorsal view with margin of gena flat behind eyes; margin of gena [0.55]× length of eye in dorsal view; posterior ocelli separated from eyes by [0.35]× its diameter in dorsal view. Mesosoma. Pronotum moderately long, smooth and polished, with distance from tegula to head greater than [0.4]× distance from tegula to hind margin of propodeum; mesoscutum smooth and polished, with notaulus weakly marked; scutellum, in dorsal view triangular; mesopleuron polished, with fine bristles anteriorly and ventrally; epicnemial carina present ventrally, extending until reaching the level of the lower corner of the pronotum laterally; metapleuron polished, with sparse, fine bristles evenly spaced and with a strongly longitudinal groove in lower part below spiracle; propodeum smooth dorsally, laterally with scattered fine bristles. Fore wing [10.0] mm; cu-a opposite to the base of Rs&M; 2 rs-m [0.7]× as long as abscissa of M between 2 rs-m and 2 m-cu; hind wing with abscissa of Cu 1 between M and cu-a [1.0]× length of cu-a. Tarsal claw with basal lobe longitudinally elongated, with claw apex clearly overtaking the posterior margin of lobe. Metasoma. Tergite I [1.8]× as long as posteriorly broad; tergite II [1.5]× as long as posteriorly broad; tergite III [1.3]× as long as posteriorly broad; tergites IV–V [1.2]× as long as posteriorly broad; ovipositor slender, [1.65]× as long as hind tibia; lower valve with slightly swelling in the base and mid region. Coloration. Head black, except apical margin of clypeus slightly yellowish, mouthparts orange, except apex of mandible black; antenna dark brown. Mesosoma entirely orange. Metasoma entirely black. Anterior and mid leg orange, except mid tarsus blackish, hind leg entirely black. Fore wing blackish with one yellowish band extending backwards from anterior margin, just proximal to the pterostigma to the encounter of cu-a to base of the Rs&M; hind wing black with apex yellowish; pterostigma yellowish. Ovipositor reddish brown. Male. Unknown. Type material: Holotype: ♀, BRAZIL, Mato Grosso, 12°50’S / 51°47’W, Mata de galeria, 23.ix.1968 (O.W. Richards, R.S. & R. G.S. Exped. leg.), #1968–260, BNHM. Distribution. Brazil (Fig 170). Biological notes. Host unknown. Etymology. The specific name come from the Greek words “mono” =one + “taeni” =band, referring to the coloration of the wing of the type-specimen. Comments. Acrotaphus monotaenius sp. n. closely resembles A. cuzconus sp. n. mainly by having fore wing blackish with one yellowish band extending backwards from anterior margin, just proximal to pterostigma to encounter of cu-a to base of the Rs&M, but differs from it mainly by having tarsal claw with basal lobe longitudinally elongated, with claw apex clearly overtaking the posterior margin of lobe, mid leg entirely orange and metasoma entirely black (tarsal claw with basal lobe quadrangular, with claw apex slightly overtaking the posterior margin of lobe, mid leg entirely black and metasoma entirely reddish orange, in A. cuzconus sp. n.).

Published as part of Pádua, Diego G., Sääksjärvi, Ilari E., Monteiro, Ricardo F. & Oliveira, Marcio L., 2020, Review of the New World genus Acrotaphus Townes, 1960 (Hymenoptera: Ichneumonidae: Pimplinae), with descriptions of fifteen new species, pp. 1-62 in Zootaxa 4719 (1) on pages 45-46, DOI: 10.11646/zootaxa.4719.1.1, http://zenodo.org/record/3602788