Silba tekei, 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 : 527

Silba tekei sp. nov.

Description. Male: Head: Eyes bare. Frons 0.6x the width of an eye, subshining black, dulled by microsculpture, frontal and interfrontal setulae less than 0.25x length of orbital seta. Orbital plates shining black, bare apart from the orbital seta. Lunule with brownish ground colour, intensely covered in silver pollinosity as to a lesser extent are parafacials and face. Anterior genal setulae in a single row of 5 along mouth margin, these slightly separated from the other setulae. Antennae; 1st flagellomere black apart from a hint of orange-brown at extreme medial base, length to depth ratio 3.6:1. Arista long plumose, ratio of plumosity at maximum extent to depth of 1st flagellomere 1.4:1.

Thorax: mesonotum subshining blue black. Anepisternum 2 anterior and 3 posterior setae. Katepisternum with 2 setae near the dorsal margin, the posterior longer and stronger than the anterior. Proepimeron and proepisternum each with 1 seta. Scutellum with disc heavily grey dusted, on margin between lateral and apical setae with 5 setulae on the left and 3 on the right, none between apical setae. Calypteres white with white fringes. Wings clear, wing length 3.5mm. Legs entirely black, basal tarsomeres yellow/brown, apical segments darkened.

Male terminalia (Figs. 23–24): epandrium and associated structures of the standard S. admirabilis group type. Phallus: Basal plate, in ventral view swollen laterally from base then narrowing and at apex diverging into two narrow round ended processes, these separated by a very wide U-shaped incision, bearing a few spicules ventrally.

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

Paratypes. Mabanga, P.N.G., 29.ix. 1952, 1 ♂; 20.xii.1951, 1 ♂ and 18.ix.1952, 1♂.

Specimens in MRAC.

Etymology. The specific epithet refers to the Teke people of the Congo.