Kertomesis acatharta is a moth in the family Autostichidae.

The forewings are whitish ochreous, irregularly marbled with light purplish-grey suffusion irrorated (sprinkled) with black.

The dark colouring forms a basal patch containing two short ochreous-yellow streaks from the base and limited by a pale yellowish-tinged line from before one-third of the costa to two-fifths of the dorsum, somewhat angulated and tending to be interrupted on the fold.

It also covers the dorsal three-fifths of the rest of the wing, including two or three small yellowish spots beyond the middle, and extending as a fascia to the costa at three-fourths, and along the termen to the apex.

There is a small dark spot on the costa before the apex.