Yes, thiscan be a tough group. I think it's between Pero morrisonaria and Pero ancetaria. Pero honestaria has a straighter post median (PM line) where it meets the inner margin of the forewing. Looking at the PM line in your photograph it forms a deep cavity midway across the wing so I 'm leaning towards Hubner's Pero (Pero ancetaria). Have a look at the info' on this link http://bugguide.net/node/view/11622. Unfortunately, both species seem a little variable so not easy. Ian
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Thank you so much for your help on the moths I have trouble with.
Yes, thiscan be a tough group. I think it's between Pero morrisonaria and Pero ancetaria. Pero honestaria has a straighter post median (PM line) where it meets the inner margin of the forewing. Looking at the PM line in your photograph it forms a deep cavity midway across the wing so I 'm leaning towards Hubner's Pero (Pero ancetaria). Have a look at the info' on this link http://bugguide.net/node/view/11622. Unfortunately, both species seem a little variable so not easy. Ian