Blepharomastix crusalis is a species of moth in the family Crambidae. It was described by Herbert Druce in 1895. It is found in Veracruz, Mexico.[1]
The wingspan is about 25 mm. The forewings and hindwings are pale fawn. The forewings edged with brown along the costal margin. There is a spot in the cell and there are three dark brown bands crossing the wing. The hindwings are crossed by two brown bands, the marginal line is spotted with brown.[2]