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According to Engel the two species are very difficult to separate and also FGG says that the females can not be separated in his online key. This is a female...... :-) As D. gracilis is only known from Sardinia, this may well be D. bincincta, Piluca is right! Although D. gracilis is also known from France.... The doubtful presence seems to mean that someone doubts D. gracilis as a valid species. Otherwise the species wouldn't occur anywhere and would be non existant.