I was in the office one evening last week when two insects hit the side window. I open it to find two large Cockchafer Beetles Melolontha melolontha on the sill. The Cockchafer beetle is also known as the May Bug. They are a very large beetle and are often mistaken for Cockroaches. Cockchafer's chew and eat fresh leaves of a variety of trees and shrubs. They do not bit or sting so there is no need to fear them.