Thubana isocrypta is a moth in the family Lecithoceridae. It was described by Edward Meyrick in 1911. It is found in Sri Lanka.[1]
The wingspan is about 15 mm. The forewings are rather dark fuscous. The second discal stigma is obscurely darker and there is a cloudy fuscous-whitish dot on the costa at three-fourths, where a very faintly indicated very obtusely angulated pale line runs to the dorsum before the tornus. The hindwings are grey.[2]