Silba lubumbashi, 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 : 523

Silba lubumbashi sp. nov.

Description. Male: Head: Eyes bare. Frons subshining black, dulled by fine microsculpture, with vet short frontal and interfrontal setulae, 0.6x the width of an eye. Lunule silver pollinose, parafacials slightly pollinose as is are lateral margins of face. Orbital plate bare. Anterior genal setulae forming a single row of 4 anteriorly, these slightly separated from the other setulae on the genae. Antennae; 1st flagellomere length to depth ratio 3.2:1, medial surface orange yellow basally, this colouration extending along the ventral surface for the basal third of the flagellomere. Arista with plumosity which at its maximum extent is approximately the depth of the 1st flagellomere. Thorax: mesonotum shining black contrasting with the silver grey dusting on the scutellar disc. Pleura sub-shining black, anepisternum with 3 strong setulae posteriorly and 2 anteriorly. Katepisternum with 2 strong setae on dorsal margin, posterior much stronger and longer than anterior. Proepimeron and proepisternum each with 1 seta. Scutellum with disc slightly grey dusted, on margin apical setae missing, 2 setulae on the right side between lateral and apical setae, none on left (possibly due to damage). Calypteres white with a whitish fringe. Legs black apart from all basal tarsomeres which are yellow apical tarsomeres slightly darker. Wings clear, wing length, 3.5mm Male terminalia ( Figs. 15–16 ): epandrium and associated structures of the standard S. admirabilis group type. Phallus in lateral view a rather open U-shape, basally with only a few small spicules, basal plate thin, almost transparent, as long as phallus, in ventral view diamond-shaped, widening on apical third to form a sharp lateral point, often with serrated margin, towards apex narrowing abruptly to form two apical sharp serrated prongs, a narrow V-shaped incision between the two.

Type material. Holotype ♂. DEMOCRATIC REPUBLIC OF CONGO; Lubumbashi , (label reads Elisabethville), 15.ii.1939, leg. H. J. Brédoi . Specimen in RBINS.

Paratype; SOUTH AFRICA; Roodeplaat Dam N.R., 25Km NE Pretoria, 2.i.1995, A. Freidberg, 1♂. Specimen in TAUI.

Etymology. The specific epithet refers to the city of capture of the holotype.

Figures

FIGURES 15 – 16. Silba labumbashi sp. nov. 15. Phallus lateral view. 16. Same ventral view. FIGURES 17 – 18. Silba mbuti sp. nov. 17. Phallus lateral view. 18. Same ventral view.