Tiger Bee Fly - If you have carpenter bees, this fly is your friend. Parasitoid of Carpenter Bees: Female Tiger Bee Flies lay their eggs near the nest entrances of Eastern Carpenter Bees (Xylocopa virginica). When the larvae hatch, they crawl into the nest and feed on the carpenter bee larvae/pupae. Because of this, you’ll often spot them hovering around wooden structures, decks, or eaves where carpenter bees have drilled their tunnels. (AI Identification - Gemini)