I caught this bug trying to enter my Hive I have stills and video which Ill try to up load, I have never seen the like of this bug before, in my 35 plus years of gardening, any information is welcome more so if its a threat to my Bees.
This is a hoverfly (Syrphidae), and I would say that it is a Volucella pellucens. Adult hoverflies visits flowers to feed on nectar and pollen and are thus important pollinators. Their larvae lives usually on plants (one species, Merodon equestris, can be a pest), larves of aphids (are thus beneficial) or dead organic matter. The larvae of Volucella belongs to the latter category, but are unique in that they live in the nests of wasps and bumblebees. In the case of Volucella pellucens, its larvae lives in the nests of the wasps Vespula germanica and V. vulgarisand there they feed on dead larvae and other debris. I have no idea why it would enter beehives - perhaps it was attracted by the smell (well, a beehive have to smell like hoverflyfood), perhaps it can occasionally lay eggs in beehives instead of wasps nests, perhaps it mistook your bees for wasps, perhaps it had some other reason or perhaps it had no reason at all.