Prionapteryx albicostalis is a moth in the Crambidae family. It was described by Hampson in 1919. It is found in India (Madras). The wingspan is 28 millimetres (1.1 in). The forewings are white, suffused with rufous and irrorated with black in the interspaces. The costal area is pure white, with a slight rufous tinge towards the base. The hindwings are white, faintly tinged with red brown.