Batman Hoverfly

 I first noticed this beautiful golden hoverfly Myatropa florea by the sound it made - a load buzz - when it was hovering close to my head in the garden. 

While I watched it settled on the rim of a flower pot full of rainwater and began laying eggs around the rim. 

This is one of the easier hoverflies to identify because of the distinctive markings on its bluish-grey thorax - that black marking at the rear edge looks like batman's silhouette.

When the eggs hatch they'll develop as rat-tailed maggots like these, with an extendable breathing tube that acts like a snorkel, allowing them to breathe air while submerged.