Silba saegeri Macgowan, 2015, sp. nov.

Silba saegeri sp. nov.

Description. Male: Head: Eyes bare. Frons 0.6x width of an eye, subshining black with short frontal and interfrontal setulae which are not more than 0.25x length of orbital setae. Orbital plate bare apart from the orbital setae. Lunule with brownish ground colour, slight silver dusting as have face and parafacials. Anterior genal setulae short, in a single row of 3–4 along the mouth margin. Antennae; 1st flagellomere black apart from a hint of orange-brown at extreme medial base, length to depth ratio 3.2:1. Arista plumose, ratio of plumosity at maximum extent to depth of 1st flagellomere 1:1.

Thorax: mesonotum and pleura subshining black. Anepisternum with 2 strong anterior setae and 3 strong posterior setae Katepisternum with 2 setae, anterior slightly weaker and situated slightly more ventrally than posterior. Proepimeron and proepisternum each with 1 seta. Scutellum on margin between lateral and apical setae with 4–5 setulae, none between the apical setae. Calypteres whitish with a white fringe. Wings clear, wing length 3.5mm. Legs black but with all basal tarsomeres yellow,

Male terminalia (Figs. 19–20): epandrium and associated structures of the standard S. admirabilis group type. Phallus: basal plate, in ventral view forceps-shaped, widening only slightly for basal two thirds then slightly constricted towards apex, apical incision long stretching almost half length of basal plate, a relatively broad apically, basally more of a narrow slot. In lateral view apices expanded and laterally flattened, resembling paddles. Basiphallus rather broad, bearing numerous spicules.

Type material. Holotype ♂. DEMOCRATIC REPUBLIC OF CONGO; P.N.G. (Park Nationale Garamba), 27.iii.1952, Miss. H. de Saeger.

Paratypes. All taken within the Park Nationale Garamba by Miss. H. de Saeger. 21.vii.1950, 1♂; 21.xii.1950, 1♂; 17.vi.1951, 1♂; 18.vii.1951, 1♂; 21.vii.1951, 1♂; 8.x.1951, 1♂; 12.x.1951, 1♂; 8.xi.1951, 1♂; 20.xii.1951, 1♂; 21.xii.1951, 1♂. Pidigala, 23.iv.1952, 1♂; 8.v.1952, 1♂; 19.v.1952, 1♂. Mt. Tungu (S), 9.vi.1952, 1♂; 1.ix.1952, 2♂. Mabunga, 29.ix.1952, 1♂.

Specimens in MRAC.

Etymology. The specific epithet refers to the H. de Saeger expedition which captured the holotype of this species and many of the other specimens described in this paper.