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Eguzki

They are not strange at all. E arbustorum often has these stripes, but so do one or two other Eristalis spp. Where I live in England, E arbustorum usually has two generations a year and the earlier ones will be brightly marked with tawny golden patches on abdomen and the later ones (this time of year) have rich dark brown almost black abdomens with fine white stripes. This year though, we had a lot of the white striped ones in the summer too. Do you have a picture showing the face front on - that might be helpful. I would have to check my books to be sure of ID though - other forum members will know better than me.