Silba setiphallus
Description. Male: Head.; Eyes bare. Frons matt black with numerous short frontal and interfrontal setulae no
more than 0.2x length of orbital seta. Orbital plate bare, subshining black, dulled by micro sculpture, bare apart
from orbital seta. Lunule setulose with dark ground colour, light grey dusted as are face and parafacials. Antennae
entirely black, 1st flagellomere 3x as long as deep. Arista with short plumosity, at maximum extent 0.5x depth of 1st
flagellomere. Anterior genal setulae in single row along mouth margin, anterior 3 setulae well separated from the
rest, none of these particularly strong. Thorax: Dorsum subshining, slightly grey dusted, covered in rather coarse black setulae approximately 0.25x
length of orbital seta. Thoracic sclerites subshining and slightly grey dusted, anepisternum with 2 strong anterior
setae and 3 posterior, remainder of sclerite with scattered long black setulae. Katepisternum with two strong setae
near dorsal margin, the anterior slightly shorter and weaker than posterior, four fine setulae anterior to anterior seta.
Proepimeron with one setulae. Scutellum grey dusted, on margin between apical setae with 4 strong setulae,
between lateral and apical setae with 2 setulae on the right side- the longest almost half the length of apical seta,
left side with setulae rubbed off . Calypteres greyish brown with a dark fringe of uniform length. Wings slightly
infuscated anteriorly, wing length 4.0mm. Legs entirely black including ventral fringe of anterior and posterior
tarsomeres.
Male terminalia: (Figs. 29–32) In lateral view epandrium 1.5x wider than high, bearing long setulae at
posteroventrally cerci almost half the height of the epandrium, roughly rectangular in shape, bearing numerous fine
setulae apically. Prensisetae and surstyli projecting beyond the shell of epandrium. Surstyli; in ventral view black
peg-like prensisetae obvious on basal plate, 8 on one side and 7 on other, a pair of small setulae present below base
of cerci, margin of surstylus extended into a lobe its margin bearing a row of setulae the posterior 4 of which are
markedly longer and stronger than the rest. Phallus a stout J -shape with a basal lobe, main section covered in tiny
setulae for most of its length, basal lobe simple