Cymbopteryx unilinealis is a moth in the family Crambidae. It was described by William Barnes and James Halliday McDunnough in 1918.[1] It is found in North America, where it has been recorded from Arizona.[2]
The wingspan is 14–16 mm. The forewings are white, irrorated (speckled) with dark brown and with a slight dark brown postmedial line, as well as a fine dark brown terminal line. The hindwings are white, irrorated with brown.[3] Adults have been recorded on wing in January and July.