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Operophtera brumata - female

Operophtera brumata - Female
Kennebunk, York County, Maine, USA
October 31, 2010
Size: 1.1 cm
Found on a wall.

Operophtera brumata female
This is for sure a winter moth female! On Bruce spanworm the wing buds would be much shorter than the second segment of the abdomen. In winter moth the wings are longer than the second segment. We do see a few in late October in Boston too, so the timing is fine, but on the early end. And winter moth is in Kennebunk, ME. A really nice picture too. This gal is very fat and sassy, we have had gals this size lay up to 400 eggs (the average is closer to 200). In MA we are finding some spots where winter moth is expanding its range and you can also find up to 10% of the population as hybrids (you can only truely ID these with a dna test). But your photo looks very good as a poster child for winter moth. Thanks for the nice post. A nice addition to BugGuide, since this critter is now in ME, NH, MA, RI, CT and NY (Long Island). If anyone sees one of these in a state not listed above, please send me a specimen so that we can confirm it via a dna test.

Moved from Moths.

Wing buds confirm id. Bruce spanworm females do not have these.

Thanks for mentioning that. I added the info to the guide page. According to a Canadian web page, both species have vestigial wings but those of O. bruceata are a third the size.

You're welcome!
There are some female pictures residing in the genus page that can now, with this info, probably be moved to species.

Moved from ID Request.

See also Operophtera
Operophtera brumata is a common winter moth near Boston. Females are wingless. It may be too early to see them flying.

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