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is it the trailing edge which is not banded ?
On this version of the species its the area between the rear and middle crosslines not being shaded. On the banded form the area is shaded darker than the ground colour which results in a broad darker band running across the breadth of the insect.
Thanks Cathal,Think I can see what you are meaning in Wave 2.
If you check in a book or in the carousel of 'Idaea aversata' you will see the broad dark band of the banded form. The non-banded form seems to be more frequently posted on iSpot and maybe the more commonly encountered in general.
Will Do Cathal,got the books here to hand as I work through the latest catch,Thanks Again...g
Lat/Lng: 55.9416, -2.9037
OS grid ref: NT436724