With a body length generally of about 16mm, Sericomyia silentis is one of the largest hoverflies in the Netherlands.
Its size, broad abdomen, and its pattern of yellow, narrowly wedge-shaped abdominal bars, which usually do not quite meet in the centre of the abdomen, are distinctive, though it should be noted that there are quite a number of smaller hoverflies with rather similar patterning.

1st & 2nd photo: Zanderij Crailo, Hilversum, The Netherlands, 29 August 2013
3rd photo: Fochteloërveen, The Netherlands, 25 September 2015