Desmia desmialis 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 from Arizona.[2]
The wingspan is 17–20 mm. The forewings are brown over a whitish ground color. There is a quadrate white patch near end of the cell, bordered laterally by black lines. Below this is a second similar patch and a third white irregular oval patch occupying the subterminal area. This patch is outlined in black and connected with the costa by a dark streak. The hindwings are brown crossed in the median area by two semiparallel waved dark lines. The space between these lines is whitish sprinkled with brown scales.[3]