Profenusa thomsoni

A small (3 to 4 mm) black bodied insect with infuscated wings. The larvae mine the leaves of Birch - see ‘Further info.’ link)

Adult Leafmine * Leafmine can only be reliably recorded if the larva is present and can be photographed (from above and below).

Adult: Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Leafmine: Can only be reliably recorded if the larva is present and can be photographed (from above and below).

Areas where Birch is present.

Adult May to July. Leafmine: late summer.

Although it seems to be widely distributed in England it is rarely encountered or recorded.

Rare in Leicestershire and Rutland.

http://www.leafmines.co.uk/html/Hymenoptera/P.thomsoni.htm