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I believe this syrphid belongs to the species Eristalis arbostorum, am I right?
Thanks

location: Barcelos, Portugal
date: 2006/08/25

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I think so.

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Thank you Paul.

Is it possible, from these photos, to be absolutely sure?

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Yes in my opinion you might be sure, because you can see the face, which is with out a black stripe and also you can see the femur 3 very well, which makes the differences between arbustorum (entirely black )and lineata (the bases are yellow). Hope you understand my English
amalia

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Thank you Amalia, for your explanation

Your English is good, don't worry