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Dark blue fly
Observed: 15th April 2011 By: bgreer
Added: 1st May 2011
Dark (navy) blue fly. About 2cm long.Long slim abdomen. Quite long ribbed looking antennae. Transparent blue tinted wings. Appears every year in garden in spring on Jacob's Ladder plant which is then eaten by grey/green caterpillars. I assume the caterpillars are the larvae of the fly.