Dichogama prognealis is a moth in the family Crambidae.

It is found in Costa Rica[1] and Ecuador.

The forewings are pearly-white with a large yellow patch at the anal angle.

There is a series of four glossy bluish-black bands extending across the wing from the costal margin as far as the yellow colour, and there is a small round black spot at the anal angle.

The inner margin is edged with black near the base.