Taxonomic revision of the Afrotropical hover fly genus Senaspis Macquart (Diptera, Syrphidae) Author Meyer, Marc De https://orcid.org/0000-0003-0755-2898 Royal Museum for Central Africa, Invertebrates Section and JEMU, Leuvensesteenweg 13, B 3080 Tervuren, Belgium marc.de.meyer@africamuseum.be Author Goergen, Georg https://orcid.org/0000-0003-4496-0495 International Institute of Tropical Agriculture, Biodiversity Centre, 08 BP 0932 Tri Postal, Cotonou, Benin Author Jordaens, Kurt Royal Museum for Central Africa, Invertebrates Section and JEMU, Leuvensesteenweg 13, B 3080 Tervuren, Belgium text ZooKeys 2020 2020-12-14 1003 83 160 http://dx.doi.org/10.3897/zookeys.1003.56557 journal article http://dx.doi.org/10.3897/zookeys.1003.56557 1313-2970-1003-83 5D883EC653064AC3A0D78CA867324596 3CD12B279B9C50768125F2697B2F0E98 Senaspis xanthorrhoea (Bezzi, 1912) Figs 8 , 48-51 , 62 , 78 , 89 , 100 Protylocera xanthorrhoea Bezzi, 1912: 416. Differential diagnosis. A species with a distinct medial dark brown macula on the wing (Fig. 78 ). It can be differentiated from other Senaspis species with a distinct wing macula by the coloration of the abdominal terga which is uniformly dark yellow to yellow-orange (Fig. 100 ) (at least terga I and II completely dark brown in S. dentipes (Fig. 91 ) and S. haemorrhoa (Fig. 95 )). Examined material. Protylocera xanthorrhoea Bezzi: Holotype , female, " Protylocera // Type // Protylocera xanthorrhoea // Bezzi." "Holo- // type" "Voi. // 20. VI. to // 21. VII." "B.E. Africa. // C.S. Betton. // 98-12" " Protylocera // Protylocera xanthorrhoea // n. sp." "NHMUK010369876" [NHMUK]. Other material. Kenya• 1♂ 1♀; Kasigau; Nov. 1938; V.G.L. van Someren leg.; CNC • 1♂ 1♀; Nairobi; 25 Aug. 1951; L.C. Edwards leg.; NHMUK • 2♀♀; same collection data as for preceding; 14. Dec. 1951 • 1♀; same collection data as for preceding; 22 Dec. 1951. Description. Body length: 12.6-14.3 mm. Wing length: 9.5-10.4 mm. Male (Fig. 8 ). Head (Figs 48 , 49 ). Eye bare; narrowly dichoptic, eyes separated for width equal to 1-2 facets; narrow separation for distance at most equal to length of ocellar triangle; facets dorsally slightly larger, at most twice as large in diameter as ventral ones. Frons black-brown; subshiny, with sparse greyish to greyish brown pollinosity throughout except dorsally of antennal implant; with medium long pale pile. Face black-brown, more reddish brown along buccal cavity; weakly subshiny, with dense greyish to greyish brown pollinosity, only facial tubercle weakly shining black; in parts with dispersed pilosity of long pale pile; facial tubercle strongly pronounced. Gena colour and pollinosity as ventral lateral margins of face; with short to long pale pilosity. Occiput red-brown, covered with dully grey pollinosity; with dispersed pale pile. Antennal segments black-brown, arista pale yellow. Thorax (Fig. 62 ). Scutum weakly subshiny black; with dark brown to black pollinosity; with short pale pile; in medial part intermixed with patches of black pile. Scutellum rounded, clearly marginated, slightly more than twice as wide as long; brown, towards posterior margin gradually more yellowish; with short pale pilosity except on disc where black pile, along apical margin longer pile. Pleura ground colour black-brown, sparsely greyish pollinose; covered with dispersed long pale pile except on meron, ventral part of katepimeron, dorsomedial anepimeron, anterior part of katepisternum and anterior anepisternum. Legs . Reddish brown to orange-brown; with short pale pilosity, along posterior margin of pro- and mesofemora, and dorsal and ventral margin of metafemur with longer pale pile. Metaleg (Fig. 89 ), femur moderately thickened, with distinct ventral swelling in apical fifth, a second less developed thickening proximal of this, with strong dark setae where swollen; tibia thickened and slightly curved, pile along ventral margin more dense and dark. Wing (Fig. 78 ). Largely hyaline, with very faint yellowish brown tinge especially along veins; with distinct dark brown macula running from anterior margin and covering most of stigma, parts of cell r1 and r2+3, distal part of cell br and basal part of r4+5, decreasing in colour on anterior part of cell dm. Calypters yellow-white; with fringe of yellow-white pile. Cell r1 closed, petiole variable in length, usually shorter than height of base of stigma. Vein R4+5 sinuate, not appendiculate or, at most, with trace of appendix. Abdomen (as in Fig. 100 ). Uniformly subshiny dark yellow to yellow-orange, except tergum I and anterior margin of tergum II where darker, in medial part of tergum II dark area extending to halfway tergum; with short pale pilosity, except medially in posterior half of terga II and III where dark pile. Sterna yellow-orange; with long pale pilosity. Male genitalia not dissected. Female. As male except for the following character states: Eye distinctly dichoptic (Figs 50 , 51 ), facets equal to subequal in size. Frons subshiny black to black-brown, dorsally more red-brown; with greyish brown pollinosity dorsally, more greyish pollinose ventrally. Wing medial macula more extensive with dark streak along posterior half of cell bm and basal part of cell cua1. Abdomen (Fig. 100 ), dark area in medial part of tergum II sometimes less extensive. Distribution. Kenya. Incertae sedis