In order to defend themselves against predators, insects have adopted different ingenious strategies. Thus, the hoverflies have evolved by modifying their look so they can resemble the wasps - http://ucanr.edu/blogs/bugsquad/blogfiles/1249.jpg. In this image you can see the wing of a hoverfly, especially the veins which provide strength to the wing, as well as the hairs that play a sensory role.