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hi Gerard and Xespok,

'wo', all these names :o
I can not understand these at the moment but I have good news about identification of these Hemiptera.

Yes, it is Issidae and the genus is Issus. (you are right Gerard!)
And Th. Heijerman coud also say it is Issus coleoptratus!

I think these sp. is 'normally' active in juni.
Rather common in the south of Holland.
So this observation is rather special in North-west of Holland in April.., but I have low of information to confirm this..

Robert, Amsterdam