Phylomictis decretoria is a moth in the family Depressariidae.

The forewings are creamy ochreous with reddish-fuscous markings, and white between veins.

There is a pink border along the middle third of the costa and a median longitudinal band of deep red fuscous along the wing to the end of the cell, where it bifurcates, and along its whole course gives off linear branches to the costa and hindmargin, and is thickened toward the inner margin by two longitudinal short bands which give off branches to the inner margin.

The branches are given off as fine lines, and thicken proportionately as they approach either border.

The inner border is suffused with fuscous, and the whole wing more or less tinted with pink.