Silba bakongo, 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 : 518

Silba bakongo sp. nov.

Description. Male: Head: Eyes bare. Frons 0.6x width of eye, subshining black, dulled by microsculpture, frontal and interfrontal setulae less than 0.25x length of orbital seta. Orbital plates shining black. Lunule with dull orange ground colour, covered in silver pollinosity as to a lesser extent are parafacials and face. Anterior genal setulae in a single row of 6–7 along mouth margin, these slightly separated from the other setulae. Antennae; 1st flagellomere black apart from an obscure brownish area at extreme medial base, length to depth ratio 3.5:1. Arista plumose, ratio of plumosity at maximum extent to depth of antennal postpedicellus 1.1:1

Thorax: Mesonotum subshining blue black. Anepisternum with all setae either broken or obscured by the mounting pin and glue. Katepisternum with 2 setae near dorsal margin, the posterior longer and stronger than anterior. Proepimeron and proepisternum each with 1 seta. Scutellum with disc grey dusted, on margin between lateral and apical setae with one setula on left side, none between apical setae. Calypteres white with white fringes. Wings clear, wing length 3.2mm. Legs entirely black, basal tarsomeres slightly darker orange than in other species, apical segments darkened.

Male terminalia ( Figs. 3–4 ): epandrium and associated structures of the standard S. admirabilis group type. Phallus: basal plate, in ventral view widening evenly from base to apex, at apex forming two parallel sided processes separated by a deep, wide U-shaped incision. In lateral view basal plate extending past the apex of the phallus, apices expanded and laterally flattened, resembling paddles. Basiphallus of normal size, with only a few small spicules.

Type material. Holotype ♂. DEMOCRATIC REPUBLIC OF CONGO; P.N.G. (Park Nationale Garamba ), 23.iv.1951, Miss. H. de Saeger.

Paratypes: P.N.G. (Park Nationale Garamba ), 11.ix.1950, 1♂; 28.ix.1951, 1♂; 2.iv.1952, 1♂; 3.vi.1952, 1♂; 1.ix.1952, 1♂ and 22.ix.1952, 1♂. Ndele, 18.vi.1952, 1♂, all Miss. H. de Saeger.

Specimens in MRAC.

Etymology. The specific epithet refers to the Bakongo tribe of the Congo.

Figures

FIGURES 3 – 4. Silba bakongo sp. nov. 3. Phallus lateral view. 4. Same, ventral view. FIGURES 5 – 6. Silba boulangi sp. nov. 5. Phallus lateral view. 6. Same, ventral view. FIGURES 7 – 8. Silba bredoi sp. nov. 7. Phallus lateral view. 8. Same, anterior view.