When I visited one of our daisy fleabanes I saw this fly with its iridescent wings and thought it was a hoverfly. But once I got the shot and looked closer I saw that it wasn’t. BugGuide told me that it’s a Predatory Fungus Gnat- Keroplatidae. They are called predatory because their larvae feed on microscopic organisms by spinning sticky webs of their own and depositing acid droplets to kill their prey. The larvae do also feed on fungal spores caught in the web, hence the name, and dead of their own species or other deceased insects. Part of the cleanup crew. It’s a complicated and dangerous world out there. Be thankful you are at the top of the food chain…for the most part.
Obviously the adult prefers pollen.