CENTRAL FLORIDA CRITTER OF THE DAY: Common Oblique Syrphid Fly (Allograpta sp. likely obliqua)
Also commonly called hover fly or flower fly. Adults pollinate
larvae are important predators, feeding primarily on aphids. “When larval populations are high they may reduce aphid populations by 70 to 100%”
In turn the larvae is a food source for several species of wasps.
How to distinguish species: http://bugguide.net/node/view/767641
Shown on Florida Native Plant: GROUNDSEL TREE; SEA MYRTLE (Baccharis halimifolia)
My take: Don’t Swat that Fly