Voliba psammoessa is a moth in the family Crambidae.

The forewings are whitish, finely irrorated with ochreous-fuscous and with dark-fuscous markings.

There is a dot on the base of the costa and a fine transverse fascia, as well as a pale-centred discal ring beyond the middle, connected by a fine dentate line with the dorsum.

There is also a line from the costa, at first straight, then describing a small outward curve, and ending above the tornus.

The hindwings are whitish, with a pale-fuscous suffusion towards the apex, containing an obscure fuscous line.