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There are 6 species of Rhagio in the UK only 2 do NOT have Mottled Wings Rhagio tringarius R. annulatus (rare)
Rhagio lineola dark wing stigma
Rhagio notatus wing stigma
Rhagio scolopaceus Mottled
Plus one other R. strigosus Mottled
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No, mottled wings is a feature only found in 2 species, scolopaceus and strigosus. A dark stigma alone does not equate to 'mottled wings'. One spot does not a mottle make!
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I did not say a Stigma equated to Mottled Wings Ian you concluded that
ie Because I have a pint of milk outside my front door does not mean I have a cow in the back garden LOL
I simply stated the facts there are 6 UK Species
two have no markings
two have dark stigma
two have mottled wings
Mmmm? But you did say that there are 6 species of Rhagio in the UK and only 2 species do NOT have mottled wings. Therefore, you were saying that four species do have mottled wings. I could only then assume that your mottling referred to the stigma, as there is nothing else on the wings of a spotty variety!
Nice family of flies, anyway. lineola will be out in numbers, soon, on birches.
All Good Stuff ...
I am sure everyone is wiser
scolepterus is particular rife last week
Lat/Lng: 53.6, -2.7
OS grid ref: SD5614