Fig. 2.

Field-based and laboratory (Y-maze) choice experiments with E. autumnalis and Hemipepsis wasps: (A) number of visits and inspections by Hemipepsis wasps to inflorescences concealed from view (covered with leaves) compared with visible inflorescences; (B) number of visits and inspections by Hemipepsis wasps to unscented inflorescences (covered with a plastic ziplock bag) compared with scented inflorescences (placed behind a plastic ziplock bag, but not covered); (C) number of choices by wasps in favour of the arm containing flowers compared with the control (empty) arm in a Y-maze (n = 20 runs with four wasps).