Silba wittei
Description. Male : Head : Eyes bare. Frons 0.5x width of an eye, subshining black, dulled by microsculpture,
frontal and interfrontal setulae less than 0.25x length of orbital seta. Orbital plate shining black, bare apart from
orbital seta. Lunule with dull brown ground colour, covered in silver pollinosity, parafacials and face more lightly
dusted. Anterior genal setulae in a single row of 7 along mouth margin, these slightly separated from the other
setulae, the basal three are the longest setulae on the genae. Antennae; 1st flagellomere black apart from an obscure
brownish area at extreme medial base, length to depth ratio 2.9:1. Arista missing.
Thorax: mesonotum subshining blue black. Anepisternum and katepisternum with most setae missing.
Proepimeron and proepisternum each with 1 seta. Scutellum with disc heavily grey dusted, on margin between the
lateral and apical setae with only 1 setulae present on right side. Calypteres white with white fringes. Wings clear,
wing length 3.8mm. Legs entirely black, basal tarsomeres yellow/brown, apical segments darkened.
Male terminalia (Figs. 27–28): epandrium and associated structures of the standard S. admirabilis group type.
Phallus: basal plate a relatively thin, translucent structure, in ventral view narrowly Y-shaped, widening gradually
from base, divided at apex by a relatively narrow, deep incision, each side simply tapering towards apex In lateral
view apices. Apex of phallus broken off, basiphallus slightly swollen, bearing spicules at base of distiphallus