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Thank you Elck for your reaction.
I visit your site before and find -searching for gnut's id- your pictures there.
I am not familiar with Sphaeromias spec., so I can not say if this is Sphaeromias fasciatus.
Are these spec. of Sphaeromias different?, so I can be sure this is Sphaeromias fasciatus?

It would be nice, to be sure of this id.
These gnats look similar on the pictures.., You could be right ;)

greeting Robert