Lethata gypsolitha is a moth in the Depressariidae family. It was described by Meyrick in 1931. It is found in Paraguay and northern Argentina. The wingspan is about 23 mm. The forewings are light ochreous-brown, with a few scattered dark grey specks. The costal edge is light dull rosy, with some slight fuscoussuffusion beneath this from the base to beyond the middle and a faintly infuscated hardly defined shade from the dorsum at one-fourth to the costa before the middle. The second discal stigma forms a small oval grey-whitish spot, edged light fuscous. There is also a slight oblique light fuscous mark from the costa at two-thirds. The hindwings are pale greyish, with the apex slightly tinged whitish-ochreous.