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Observation - 022 - UK and Ireland. Description: These small flies are completely black(including wings) apart from underside of abdomen which is bright yellow. They appear to have very small heads and were all ? feeding on wild carrot flowers. They were seen at Pagham Harbour.

These small flies are completely black(including wings) apart from underside of abdomen which is bright yellow. They appear to have very small heads and were all ? feeding on wild carrot flowers.
They were seen at Pagham Harbour.