Silba garamba, Macgowan, Iain, 2015

Macgowan, Iain, 2015, A review of the Silba admirabilis McAlpine species group (Diptera: Lonchaeidae) with descriptions of thirteen new species from the Afrotropical region, Zootaxa 4032 (5), pp. 515-534 : 520-522

Silba garamba sp. nov

Description. Male: Head: Eyes bare. Frons 0.5x width of an eye, mainly shining black with slight microsculpture, frontal and interfrontal setulae approximately 0.3x as long as the orbital setae, orbital plate bare and shining. Lunule intensely silvered, face and parafacials slightly silver pollinose. A group of four anterior genal setulae slightly separated from other setulae on the genae, none particularly strong. Antennae; entirely black, 1st flagellomere length to depth ratio 3.5:1. Arista, ratio of plumosity at maximum extent to depth of 1st flagellomere, 1.1:1.

Thorax; Mesonotum shining black. Anepisternum with 2 anterior and 3 posterior setae, Katepisternum with 2 setae, posterior slightly stronger than anterior. Proepimeron and proepisternum each with 1 seta. Scutellum rather heavily grey dusted, on margin between lateral and apical setae with four short setulae, none between apical setae. Calypteres whitish with a rather dense, long whitish fringe. Wings clear, wing length 3.5mm. Legs black with basal and second tarsomeres brownish yellow.

Male terminalia ( Figs. 9–10): epandrium and associated structures of the standard S. admirabilis group type. Phallus: Basal plate, in ventral view very long and narrow, almost parallel sided, widening abruptly at apex and forming two pointed apical processes divided by a relatively wide U-shaped incision, the entire basal plate resembling the shape of a spanner. In lateral view basal plate extending further than the phallus, apex slightly expanded. Basiphallus of normal size, a few spicules at base of distiphallus.

Type material. Holotype ♂. DEMOCRATIC REPUBLIC OF CONGO; P.N.G. (Parc Nationale Garamba ). Ndele/R., 24.ix.1952, Miss. H.de Saeger.

Paratypes. P.N.G. 23.4.1951, 2♂; 1.viii.1951, 1♂; 11.ix.1951, 1♂; 11.ix.1951, 1♂; 8.x.1951, 2 ♂; 8.xi.1951, 1♂; 18.iv.1952, 1♂; 28.vii.1952, 1♂. P.N.G., Magamba, 29.ix.1952, 1♂.

Specimens in MRAC.

Etymology. The specific epithet refers to the Parc Nationale Garamba from which the type material was collected.