Lacks the black line along the lateral margins of the tergites - to differentiate from R. campestris
No interactions present.
This is an uncommon hoverfly, so a good find and a good photo showing just the right view needed to identify it! The commoner species, Rhigia campestris, has larvae breeding in cow dung; in his book on hoverflies Alan Stubbs says that the larva of R. rostrata is unknown, but "badger latrines have been suggested as a possibility" for the breeding site.
Entomologist and biological recorder
Lat/Lng: 51.7, -2.6
OS grid ref: SO6208