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Lambdina fervidaria
	Adult
	Larva
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Geometridae
Genus:	Lambdina
Species:	L. fervidaria
Binomial name
	Lambdina fervidaria; Hübner, 1827
Synonyms
	Lambdina athasaria (Walker, 1860); Lambdina aequaliaria (Walker, 1860); Lambdina seminudata (Walker, 1863); Lambdina siccaria (Walker, 1866); Lambdina bibularia (Grote & Robinson, 1867); Lambdina semiundaria (Packard, 1867);

Lambdina fervidaria, the curve-lined looper or spring hemlock looper, is a moth of the family Geometridae. It is found in Canada (Nova Scotia, Prince Edward Island, New Brunswick, Quebec, Ontario, Manitoba and Saskatchewan) and the eastern parts of the United States, south to Georgia.

The wingspan is about 27 mm. The moth flies from May to August depending on the location.

The larva feeds on Quercus and Fraxinus. The subspecies Lambdina fervidaria athasaria prefers Abies balsamea, Picea and Tsuga canadensis

Subspecies

There are two recognised subspecies:

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