Can you please identify this species of beetle? It was about 2 cm (or 0,8 inches) in size. Photo is from Greece, Europe.
The insect in the Photo is a beetle (order Coleoptera), in the scarab family (family Scarabaeidae). It is most likely in the Genus Phyllophaga (June or May bugs) or Phyllopertha (garden chafers). Beetles such as this are commonly referred to as "Chafers" feeding on plant leaves and flowers during the day. One of the defining characteristics in the photo is the apparent "Hairiness" (setae) visible at the sides of the insect body. I am inclined to agree with the good observations expressed in the comments. It likely to be a garden chafer Phyllopertha horticola. Some helpful links are below.