Key to species of Robertsmyia Li & Yeates

1. Wing dark brown on costal third; pedicel elongate, 2.5× as long as wide, with small dorsal apical spine........................................................................................ Robertsmyia pallidoventris (Roberts)

– Wing membrane almost uniformly subhyaline, only infuscation along the anterior costal margin; pedicel 1.7× as long as wide, without dorsal apical spine....................................................... Robertsmyia aureola sp. nov.