Gyros atripennalis is a moth in the family Crambidae. It was described by William Barnes and James Halliday McDunnough in 1914.[1] It is found in North America, where it has been recorded in California.[2]
The wingspan is about 13 mm. The forewings are blackish with a deep purplish-red tinge. The basal half of the wing is defined outwardly by a curved dark line just beyond which a black dash in the cell represents the reniform spot. There is a blackish line close to outer margin with which it is practically parallel. The space between these two lines is sprinkled with white scales. The hindwings are deep black.[3] Adults have been recorded on wing in July.