Lethata obscura is a moth of the family Depressariidae.

There is also a faint, outwardly curving, transverse line from the costa at the apical third to near the tornus.

There are also a few fuscous scales scattered irregularly over the entire wing.

The hindwings are whitish, overcast with grey scales in the anal area.

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