Tulaya margelana is a moth in the family Crambidae.

The forewings are dirty ash grey, with a black curved stripe between the base of the wing and the centre.

The hindmargin is darkly dotted and the extreme base of the wings is blackish.

The whole wing is covered with rough, dark grey scales.

The hindwings are brownish grey with a line of dark shading near the posterior margin, which is finely bordered with black.