The clipping from your lawn can be a useful addition to the garden providing another source of nutrients as they decompose. But…they may also be loaded with herbicides or fertilizers and thus become a bad addition to the garden.
I was asked this week by a customer about the life cycle of a Soldier Fly and I didn’t know the absolute answer. So in my effort to improve my knowledge I found a number of websites which explain their life cycle. http://en.wikipedia.org/wik