A revision of Centrioncus Speiser (Diptera, Diopsidae, Centrioncinae) with descriptions of new species from Angola, Burundi, and Kenya Author Feijen, Hans R. https://orcid.org/0000-0002-7265-8448 Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, Netherlands hans.feijen@naturalis.nl Author Feijen, Cobi https://orcid.org/0000-0001-8756-3903 Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, Netherlands text ZooKeys 2023 2023-02-01 1144 1 93 http://dx.doi.org/10.3897/zookeys.1144.95619 journal article http://dx.doi.org/10.3897/zookeys.1144.95619 1313-2970-1144-1 565B46A4C01B454296356F3ED6472747 9485B6EA2F8E54B49F02E975297B6536 Centrioncus decellei Feijen Figs 110 , 111 Centrioncus decellei Feijen, 1983: 73. Type material. Ivory Coast, holotype ♀, Amanikro, 50 km nw of Abengourou [ 7°1'0"N , 3°52'0"W , 52 km NW of Abengourou, 194 m], ix. 1961, J. Decelle (MRAC) (not examined, but notes and pencil drawings for Feijen (1983) were used). Diagnosis (after Feijen 1983 ). Centrioncus decellei can be recognised by the flat, uniformly pruinose frons; pruinose blackish brown scutum, brownish humeral calli, chestnut-brown lateral edges; scutellum blackish brown with brown edges and lateral sides, scutellar spines yellowish; blackish brown pleura, brown anterior part of anepisternum and posterior part of anepimeron, katepisternum with brown spot anteriorly; scutellum projecting at angle of 45° from body axis; pale brown fore femur on distal half of inner side with dark brown, stripe-like spot, with ~ 38 tubercles; small, elongate, very vague, brownish central spot around crossvein r-m (Fig. 110 ), in tip of cell br, mainly in posterior part of basal quarter of cell r4+5, slightly extending into cell bm+dm; vein M4 distally of crossvein dm-m curving downward towards wing margin; tergites blackish brown, apical edges paler; female 7th spiracle in tergite (Fig. 111 ); female tergite 7 with small mesal gap at posterior edge; female tergite 10 with 3 pairs of setulae; trapezoidal anterior sclerite of female sternite 7 narrow (w/l ratio: ~ 2.7); posterior sclerite of female sternite 7 rounded U-shaped, relatively short lateral arms with tri-lobed posterior apices (Fig. 111 ); female cercus elongate, l/w ratio: 4.1; subanal plate triangular, with convex lateral sides; spermathecae wrinkled, with a dimple and some tiny tubercles. Figures 110, 111. Centrioncus decellei , ♀, holotype, Amanikro, Ivory Coast 110 wing, dorsal view 111 sternite 7, ventral view. Scale bars: 0.5 mm ( 110 ); 0.1 mm ( 111 ). Both drawings were processed, based on original pencil drawings from Feijen (1983 : figs 12, 26). Supplementary description. Wing . Small, elongate, very vague, brownish central spot around crossvein r-m (Fig. 110 ), in tip of cell br, mainly in posterior part of basal quarter of cell r4+5 to three-quarters distance to crossvein dm-m, slightly extending into cell bm+dm; vein CuA+CuP from vein CuP onward extending under angle of 25° to wing margin in straight line; vein M4, especially distal of crossvein dm-m, curving downward to wing margin (Fig. 110 ). Female postabdomen . Anterior sclerite of sternite 7 trapezoidal with w/l ratio: ~ 2.7 (Fig. 111 , Table 8 ); posterior sclerite of sternite 7 rounded U-shaped, with relatively short lateral arms, with 3-4-lobed posterior apices (Fig. 111 ); female cercus elongate with l/w ratio: 4.1 (Table 8 ); subanal plate triangular with convex lateral sides. Distribution and habitat. There are several Amanikro locations in Ivory Coast, three of which are north-west of Abengourou. However, given the label distance of 50 km from Abengourou, the correct collecting location must be Amanikro at 7°1'0"N , 3°52'0"W , 52 km NW of Abengourou, 194 m. The holotype was collected in lowland forest. This species is the only Centrioncus known to occur at a low altitude, while the single specimen is also the only Centrioncus known from West Africa.