Erannis tiliaria, the linden looper,, also known under the rather ambiguous name "winter moth," is a moth of the family Geometridae. It is found from central Alberta east to Nova Scotia, south to Missouri, Georgia, Utah and Texas.
Erannis vancouverensis was considered to be a subspecies of E. tiliaria for some time, but appears to be a separate species.
The wingspan is 32–42 mm for males. Females are wingless. Adult males are on wing in late fall.
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