A new Eumerus hoverfly (Diptera: Syrphidae) from Namibia and South Africa with notes on similar species Author Ricarte, Antonio Author Hauser, Martin phycus @ gmail. com; https: // orcid. org / 0000 - 0002 - 6368 - 3529 Author Kinnee, Scott scott. kinnee @ cdfa. ca. gov; https: // orcid. org / 0000 - 0001 - 7184 - 0697 Author Marcos-García, Ángeles marcos @ ua. es; https: // orcid. org / 0000 - 0002 - 2439 - 2630 text Zootaxa 2020 2020-12-04 4890 4 493 508 journal article 9411 10.11646/zootaxa.4890.4.3 7d7649b6-c602-48cc-aa98-9a5832aff65c 1175-5326 4306501 FCA01A97-6920-4DAC-8701-7CC57685851C Key to the African species of the Eumerus obliquus group The Eumerus obliquus group as defined in the discussion includes E. incilis Smit in Smit et al. (2017) , E. lyneborgi sp. nov. , E. obliquus , E. unicolor Loew, 1858 [= E. wainwrighti ( Curran, 1938 ) ] and E. vestitus . 1. Face below antennae polished black, without pollinosity; scutum shiny, without a pattern of pollinose markings or only with a faint vestigial pattern; tarsomeres 4 and 5 of all legs black, contrasting conspicuously with the reddish brown tarsomeres 1‾3; male eyes separated by a distance equalling the width of the anterior ocellus.............................. E. unicolor - Face below antennae always pollinose; scutum with a conspicuous pattern of pollinose markings, more reduced but still conspicuous in E. incilis [see figure 39 and 40 in Smit et al. (2017) ]; tarsi of all legs either uniform in colour or with a dark gradient towards the apex; male eyes holoptic...................................................................... 2 2. Metatarsomere 2 with a conspicuous apical extension ( Fig. 3A, B ); male metabasotarsomere unmodified.................................................................................................... E. lyneborgi sp. nov. - Metatarsomere 2 without apical extensions; male metabasotarsomere strongly modified in most species, simple in E. punctifrons ............................................................................................... 3 3 Metatibia with 2‾3 short black apical spinae ( Fig. 11A ); posterior half of tergum IV extensively pollinose............... 4 - Metatibia without apical spinae ( Fig. 11B ); tergum IV shiny between the two diagonal pollinose vittae and the posterior margin of tergum............................................................................................ 5 4 Eye with short sparse pile; metabasotarsomere brown ( Fig. 9B ) and, in male, with a small basal tooth in the sulcus [see figure 30 in Smit et al. (2017) ]......................................................................... E. vestitus - Eye usually bare; metabasotarsomere black and, in male, without teeth in the dorsal sulcus [see figure 27 in Smit et al. (2017) ]....................................................................................... E. incilis 5 Vertex with black pile and extensive areas free of pollinosity or sparsely pollinose [see figure 4A in Garcete-Barrett et al. (2020) ]; male metabasotarsomere laterally compressed, with a dorsal ridge [see figure 4E in Garcete-Barrett et al. (2020) ].............................................................................................. E. obliquus - Vertex without black pile, covered in dense pollinosity except for a narrow area surrounding each ocellus [see figure 57 in Smit et al. (2017) ]; male metabasotarsomere without ridge.............................................. E. punctifrons