Hundreds of adult Garden Chafers can sometimes be found within a few square metres of short grass.
The larvae feed underground on the roots of grasses and can become a considerable pest of lawns.
Garden Chafers belong to the subfamily Rutelinae.

1st & 2nd photo: In my yard, Hilversum, The Netherlands, 25 May 2014
3rd photo: Hilversum, The Netherlands, 28 May 2012