Over the past couple of years, I have been highlighting some species found in Montgomeryshire in the 'one to look out for' series, which are either uncommon or are confused with other species, today I’m looking at the rather elusive Northern Winter Moth.
The Northern Winter moth is definitely a species which is overlooked by moth-ers in general, either because of its flight season, which as its name suggests is a winter flying species, secondly because it’s often confused with the Winter Moth and finally it is generally much more uncommon than the Winter Moth here in Montgomeryshire, therefore you normally have to put in a bit more effort in to record it. In the past ten years it has only been recorded at seven sites in Montgomeryshire, but I think this figure could be significantly increased with more recording.
There are some subtle differences between the two species which I’ll outline here and these should help you to separate the two species with a fairly high degree of certainty.
As can be seen from the two images above (only the
males are shown for this comparison, the females only have vestigial wings and
therefore can’t fly) the Northern Winter Moth (top) is somewhat larger than the
Winter Moth (bottom) with a more tapered forewing, it is also paler with more fine markings and has a general
silky sheen to the eye.
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