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Added: 1st June 2013 Description:
About 11mm long ,in dead grasses ,Devils bit Scabious and Meadowsweet all over spot I found it .
Confidence: It might be this. Notes: It belongs to the pair Aethes hartmanniana and A. piercei. Yours looks more like A. hartmanniana to me [lighter, yellower, colouration]. The book says also smaller size [wingspan 11-17 mm, cf A. piercei 15-24 mm; median fascia more obtusely angled and silver-white spots tending to coalesce and form continuous striae]. These last I can't tell from your photos. However the habitat that you describe and mention of Devil's-bit Scabious, and the size you give (the wingspan approximating to twice the length)inclines me to plump very tentatively to A. piercei. A. harmanniana is on Field Scabious and possibly Small Scabious, and therefore usually in dry calcareous habitats.
No interactions present.
Other observations of Aethes piercei Species with which
interacts Aethes piercei