Platygraphis is a monotypic moth genus of the family Crambidae described by Harrison Gray Dyar Jr. in 1918.

[1] Its only species, Platygraphis isabella, described in the same paper, is found in Mexico.

There is an orbicular of two brown bars, filled with fulvous.

The reniform consists of two opposed arcs between the subcostal and median veins, filled with fulvous, which colour also occupies the costa, the terminal area and the tornal region.

The hindwings are white, with a median line which is forked on the cell and filled with fulvous.