Imma ergasia is a moth in the family Immidae. It was described by Edward Meyrick in 1905. It is found in Sri Lanka.[1]
The wingspan is about 20 mm. The forewings are ochreous brown, the base of the dorsum suffused with fuscous and with a nearly straight somewhat irregular thick fuscous line from beyond one-fourth of the costa to two-fifths of the dorsum. There is a spot of fuscous suffusion on the middle of the costa and a curved series of elongate fuscous spots between the veins from three-fourths of the costa to the tornus. The hindwings are dark fuscous, lighter towards the base.[2]