Fig. 1.

Location of the field experiment boxes (symbolized by rectangles). Experiments were performed in a 25 by 12-m green space located near the forensic institute of Lille, France. For each trial, the traps were simultaneously placed on the ground for 3 d, and box positions were randomized between each trial. Bold lines indicate a building wall; dashed lines depict open access; and crossed circles indicate bushes or small trees. The access holes in the boxes are indicated by an arrow and the meshed surfaces with an asterisk.