Head.—Eyes dark red; vertical triangle black, frons dull black, lower part with a somewhat quadrate greyish dust spot; face dull black, lower half appearing grey when viewed from above. Antennae dull yellowish, third joint distinctly pointed, moderately long and almost sub-triangular. Occiput moderately produced behind eye margins, black, with a little grey dust. Thorax moderately shining black, middle of dorsum with yellowish brown dust and a little pale pubescence; pleurae blackish, with some greyish dust. Abdomen shining black; a very little yellowish pubescence towards sides: genitalia with a yellowish tinge. Legs mainly yellow; coxae black, also a broad median band on femora (possibly incomplete in some individuals); tarsi darker towards tips; all femora with a row of very small bristles on about apical half of underside. Wings clear; stigma very pale yellow; anterior crossvein at about two-fifths of the discal cell; halteres yellowish. Length, 2·5–3·5 mm.