Nilothauma angustum sp. n., male. 1 wing 2 thorax, lateral view 3 legs 4 foretibial apex 5 mid tibial apex 6 hind tibial apex 7 hypopygium, dorsal view (left) and ventral view (right) 8 anterior anal tergal projection 9 posterior anal tergal projection 10 anal point 11 posterior margin of anal tergite.