Bug FAQNarrow-winged Grey
Eudonia angustea · Order: Lepidoptera · Family: Crambidae
The narrow-winged grey moth has a wingspan of about 17 to 22 mm and narrow, whitish-brown forewings with distinctive black markings. Its larvae live on mosses found on walls and in sand dunes, and adults are active from July through late autumn.
Source: Wikipedia
How to recognize it
Forewings are narrow, whitish mixed with brown, sprinkled with black; they have a dark base, whitish lines edged dark, a black orbicular outline, a black claviform touching the first line, and a black X-shaped discal mark partly filled with light brown. Hindwings are whitish-grey and become slightly darker toward the edge.
Source: Wikipedia
Size
Wingspan ranges from 17 to 22 mm (about 0.67 to 0.87 in).
Source: Wikipedia
Where it lives
Larvae feed on mosses that grow on walls and in sand dunes.
Source: Wikipedia
What it eats
Larvae eat mosses on walls and in sand dunes.
Source: Wikipedia
Life cycle
Adults are on the wing from July to late autumn.
Source: Wikipedia
When you see it
Adults appear from July through late autumn.
Source: Wikipedia
Questions people ask
Can they damage my house or belongings?
They feed on mosses, not on stored food, fabrics, wood or other household items.
Source: Wikipedia
Same family (Crambidae)
Box Tree MothCydalima perspectalisDamages trees, gardens or crops
Celery Leaftier MothUdea rubigalisDamages trees, gardens or crops
Elegant Grass-veneerMicrocrambus elegans
Hawaiian Beet Webworm MothSpoladea recurvalisDamages trees, gardens or crops
Garden Grass-veneerChrysoteuchia culmellaDamages trees, gardens or crops
Bluegrass Webworm MothParapediasia teterrellusDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Eudonia_angustea
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-22 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.