"Wolbachia [bacteria], found in a variety of insects worldwide, interacts in a range of ways with its hosts. In many insects, for example, the bacterium alters the reproductive capacity of its host to ensure that only infected individuals can reproduce. This ensures the propagation of the bacterium; and it can create reproductively isolated populations, and therefore possibly lead to new species."
The caption of a photo that gives you little more info, it says:
"In a stained egg of the small parasitic wasp, Trichogramma kaykai, are brightly staining Wolbachia. The bacteria accumulate at the end of the egg that is destined to develop into the reproductive organs. Wolbachia induce the eggs of this wasp to develop into female offspring without fertilization."