Bug FAQCurved-lined Looper Moth
Lambdina fervidaria · Order: Lepidoptera · Family: Geometridae
Also called: Curve-lined Looper Moth, Curve-lined Looper
Source: Wikipedia
Lambdina fervidaria, known as the curve-lined looper, is a moth in the Geometridae family. It lives in eastern Canada and the eastern United States down to Georgia, and flies from May to August.
Source: Wikipedia
Size
Its wingspan is about 27 mm.
Source: Wikipedia
Where it lives
It is found in several Canadian provinces and the eastern United States as far south as Georgia.
Source: Wikipedia
What it eats
The caterpillars eat oak (Quercus) and ash (Fraxinus); the subspecies athasaria also feeds on balsam fir, spruce and hemlock.
Source: Wikipedia
Life cycle
Adults are on the wing from May through August, depending on location.
Source: Wikipedia
When you see it
The moth flies from May to August, varying with region.
Source: Wikipedia
Where it comes from
Its native range includes eastern Canada and the eastern United States down to Georgia.
Source: Wikipedia
Where it is found in the US
Recorded in 36 of 51 states and DC. Most records: Maryland, Pennsylvania, Alabama, North Carolina, West Virginia, Virginia, New Jersey, Tennessee.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
When are curve-lined loopers active?
Adults fly from May to August, with timing depending on where they live.
Source: Wikipedia
What trees do the larvae feed on?
The larvae eat oak and ash, and some subspecies also feed on fir, spruce and hemlock.
Source: Wikipedia
Where can I find this moth?
It occurs in eastern Canada and the eastern United States down to Georgia.
Source: Wikipedia
Same family (Geometridae)
Willow BeautyPeribatodes rhomboidaria
Pale BeautyCampaea perlataDamages trees, gardens or crops
Large Lace-border MothScopula limboundataDamages trees, gardens or crops
Riband WaveIdaea aversata
Yellow Shell MothCamptogramma bilineata
Large Maple Spanworm MothProchoerodes lineolaDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Lambdina_fervidaria
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-23.