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A Conopid fly, probably Sicus ferrugineus. These flies lay their eggs on bumble bees. Myopa buccata looks similar but has a much longer face (see here, here and here for details).
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Photos taken in Reading University grounds, Reading, UK, on 2009-06-11.
Reader Comments (2)
I came across your blog today whilst looking for entries on Ravenser (our web page has an article by my husband Pete and I wanted to see if Google was picking it up). Wow what wonderful photos of insects you have. I am going to make a point of looking regularly. Pete runs a moth trap here at Kilnsea near Spurn Point and is also interested in insects.