Prionapteryx arenalis is a moth in the family Crambidae. It was described by George Hampson in 1919. It is found in the Punjab region of what was British India.[1]
The wingspan is 24–26 mm. The forewings are whitish, uniformly suffused with pale reddish brown and with traces of a sinuous dark line. The hindwings are whitish, strongly suffused with reddish brown.[2]