Syrphid flies were observed hovering about water and depositing small white eggs upon vegetation. The flies seemed to be territorial as when one fly would be at rest and another would approach they would engage in what appeared to be combat, if not mating. I was able to observe and video a female egg laying upon a pine tree twig. You can actually see one of the eggs in the upper right corner of this photograph which shows one of these flies resting upon a leaf that was floating upon the water's surface. These may be Parhelophilus sp. Does anyone want to take a guess at the species?