Brown fly (flies) on Hogweed inflorescence

Brown fly (flies) on Hogweed inflorescence

Observation - Brown fly (flies) on Hogweed inflorescence. Description: Images 3 and 4 were obtained on 31/07/2013 but appear to represent the same species as in Images 1 and 2 .

Images 3 and 4 were obtained on 31/07/2013 but appear to represent the same species as in Images 1 and 2 .