No interactions present.
The pale mid-tarsi confirm it as this species in the genus.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
But not necessarily this exact species I presume?
The genus is given by the loop in the wing vein (not visible in this pic, but if you look at other posts of Eristalis you will see it) and the general dark- and pale-brown pattern. There are several species which are very similar and common, but pertinax is the only Eristalis with pale tarsi on the front and mid legs. I did not mean that it is the only hoverfly with pale tarsi.
There are many factors taken into consideration generally some species require less than others , Generally with Hovers , Wing Veination Paterns, Banding and colouring on the legs , Over all body patern , presence and absence of hairs , "dusting" and banding of the eyes , colour or striping of the face some exhibit sexual dimorphism ie males and females slightly difference and so on . This particular species E pertinax is similar to its closely related E tenax in the same Genus ( share some common characteristics in Murdos example loop in wing veination ) and the pale tarsi as Murdo says is the key feature distinguishing them
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To clarify what WR has written, there are several other very common Eristalis, so don't get the idea that any with dark tarsi are sure to be tenax. It only works one way - pale tarsi = pertinax; dark tarsi you have to look at a bundle of (mostly) microscopic features to get the species.
Lat/Lng: 54.25288, -0.69238
OS grid ref: SE852849