Heteralcis platycapna is a moth in the family Lecithoceridae. It was described by Edward Meyrick in 1916. It is found in Sri Lanka.[1]
The wingspan is 13–14 mm. The forewings are rather dark fuscous with a transverse ochreous-whitish line almost at the base and a transverse whitish-ochreous line before the middle, somewhat curved outwards on each half and indented in the middle. There is also a suffused ochreous-yellow patch occupying the apical fifth. The hindwings are grey.[2]