Eudonia exilis is a moth in the family Crambidae. It was described by Henry Guard Knaggs in 1867. It is found in New Zealand.[1]
The wingspan is 18–20 mm for males and about 16 mm for females. The forewings are pale greyish ochreous, irrorated (sprinkled) with white. The first line is whitish, dark-margined posteriorly. The second line is white, blackish-margined anteriorly. The hindwings are pale whitish grey, somewhat tinged with ochreous. The postmedian line and hindmargin are darker. Adults have been recorded on wing in October, December and April.[2]