Xylocopa valga

Xylocopa valga is a species of carpenter bee common to: western, central and southern Europe, except for far northern latitudes; the Caucasus; Middle East; Central Asia; and Mongolia. The solitary bee has a black and blue coloured body, 20–27 mm in length, and densely covered with purple hairs. The small wings also have a purple tint. The bee creates cavity nests by gnawing the wood in the trunks of dead trees and in old wooden structures. It inhabits both forests and urban areas.
They have been observed pseudo-copulating on the petals of "Iris paradoxa" near Gosmaljan, Azerbaijan.