Alatuncusia gilvicostalis is a moth in the family Crambidae.

The costal area is pale yellow up to the postmedial line.

The antemedial line is dark but indistinct, faintly defined on the inner side by yellowish white.

The postmedial line is dark and rather diffused, defined on the outer side by a triangular pale yellow spot at the costa, then faintly by whitish up to vein two, then by yellowish white.

The hindwings are white, the inner margin tinged with reddish brown.