Taxonomy of the Afrotropical genus Leptomenes Giordani Soika, with description of a new species from South Africa (Hymenoptera: Vespidae: Eumeninae) Author Selis, Marco 0000-0002-8200-9441 Via dei Tarquini, 22 - 01100 Viterbo, Italy. marcozetsu @ hotmail. it; https: // orcid. org / 0000 - 0002 - 8200 - 9441 marcozetsu@hotmail.it text Zootaxa 2023 2023-01-17 5228 5 584 594 journal article 226882 10.11646/zootaxa.5228.5.3 0e0240eb-3aec-4d65-abc9-8d9c18ee6c95 1175-5326 7543288 E8E657F4-F8A4-4797-8B6A-49EFF047BA64 Leptomenes angustus ( Gusenleitner, 1992 ) comb. nov. ( Fig. 4 ) Malgachemenes angustus Gusenleitner 1992: 91 , 92, figs. 1–2, ♀ —“ Madagascar : Ankarafantsika ( Forest Reserve ) near Marovoay ” (CAS) Material examined. Holotype of Malgachemenes angustus : “ MADAGASCAR : / Ankarafantsika / ( Forest Reserve ) / near Marovoay / XII-1-1959 // E. S. Ross / Collector // Malgachemenes ♀ / angustus nov.sp . / J. Guselneitner ,det.1994 // Holotypus // California Academy / of Sciences / Type No. 16821” ( CAS ). Distribution. Madagascar : Mahajanga ( Gusenleitner 1992 ) Notes. Gusenleitner (1992) described the Malagasy endemic genus Malgachemenes , comparing it with the Neotropical genus Montezumia de Saussure, 1852 , providing as diagnostic characters the absence of an epicnemial carina and shape of the tegula. Examination of the holotype of Malgachemenes angustus ( Fig. 4 ), the only species described in the genus, clearly shows that this taxon has little in common with Montezumia , except a vague superficial similarity in habitus. The following diagnostic characters observed in this Malagasy endemic more closely match the genus Leptomenes : clypeus matte, metanotum oblique and not carinate, submarginal carina of propodeum fused to propodeal valvula, T1 subtriangular in dorsal view and not carinate, T2 without apical lamella, second submarginal cell basally acute. It should be noted that the submarginal carina of the propodeum is not developed to form a subtriangular projection as in other species of the genus, but this character is subject to interspecific variability in related genera (e.g. Antepipona de Saussure , Stenodynerus de Saussure ), therefore the same degree of variability is expected to be found in Leptomenes too. Malgachemenes angustus is moved to Leptomenes , with the genus Malgachemenes being a junior synonym of the latter.