Diasemiodes nigralis is a moth in the family Crambidae.

The outer line is represented by a nearly straight, snow-white stripe and a spot on the fold near the outer third of the hindmargin below a similar spot on the end of the cell.

The hindwings have a small white spot at the base and another beyond the cell.

There is an oblique stripe extending up from the anal angle.

[3] Adults are on wing from May to October in most of the range, but year round in Florida.