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Riband Wave (Idaea aversata f. remutata)

This was the second moth I discovered on my patio door today, and this one was peering through the side window having a good look in. It is geometer moth, of which there are two forms of this particular species, this one being Idaea aversata f. remutata. This form has fine, delicate darkish lines on its forewings, where as the other, typical form, has a wide dark cross band.