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Hi Sundew,

Did you check Haarto's (2012) key for Finland (W-Album 12) ?
The row of dots on posterior side of hind tibia are sensoria, according to him. They don't need to be black (my collection). That said, they are lacking in lanigerus, so it seems you independently rediscovered an important feature for johannis.

Please note that colouration of legs is extremely variable: even femora can be totally red in johannis.

So, it seems you are right, despite the fact that the date is extremely late for johannis.
In NL, I would never find johannis after May 5th.

Greetings

Theo