Lethata psidii is a moth of the family Depressariidae.

The forewings are light brown, with a few scattered black scales and with the costal edge dull pinkish.

There are three cloudy fuscous transverse lines, the first at one-fourth, obtusely angulated on the fold, dilated on the dorsum, the second in the middle, forming a small spot on the costa, strongly curved outwards in the disc, the third from a larger cloudy spot on the costa at three-fourths to the dorsum before the tornus, moderately curved.

The second discal stigma forms a conspicuous small round blackish spot and there is a marginal series of dark fuscous dots around the apex and termen.

This article on a moth of the subfamily Stenomatinae is a stub.