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I would be grateful for a confirmation of genus or better, please. I want to use my Fonseca key but struggle every time.

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The picture is a bit small and I can't see well all the chaetotaxy, but it should be a male Phaonia, in subventa group (I think P. subventa itself, named variegata in d'A.Fonseca). I let you check.
Thricops simplex could be a second candidate, but as far as I can see, there are neither ad on mid tibia, nor posterior on fore one. This latter has only 3 postsutural dc and setulae on posterior inner margin of hind coxa.

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Thank you very much Stephane, that is just the sort of background I wanted and it reduces the problem down to a manageable level for a beginner

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Stephane, following on from your most helpful information, using Fonseca, I think it must be Phaonia (populi) rufiventris, because it has only 1 pair of pre-sutural acrostichal bristles, and scutellum orange with only a very small dark base, although the dark median presutural stripes each seem much less than 40% of the width of the pale central stripe, unless they are both to be taken into account which seems unlikely. The single pair of p-s. acro.'s also excludes Thricops simplex. Is there anything further to say?

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Nothing else, you did all right ! :)

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That's excellent Stephane. Thank you.