cf. Amauromyza labiatarum
Mercurialis annua, Amstelveen, JP Thijssepark
This upper-surface blotch culd not be identified with certainty. The larvae, that were observed in July and August, closely resemble those of Amauromyza labiatarum in shape, colour (white in front, yellow to the rear) and details of the rear spiracalum (3 papillae, distal one hooklike).