This afternoon, a black flower wasp landed on my window, I rarely see this kind of wasp flying around. The black flower wasp (Scolia soror) is also called hairy flower wasp, blue flower wasp, or blue hairy flower wasp. It is a digger wasp which has smoky black wings that have an appealing blue sheen. The female black flower wasp is known to burrow into the ground in search of beetle grubs. When she finds one, she stings it and lays an egg on the host. There, the wasp larva pupates and overwinters in a cocoon within the body of the host.