Fig. 1

Location and interior of the experimental hut. The top image shows the field location of the hut, near Mwanza, Tanzania. The lower image shows the bed with the paired Fresnel lenses on either side, with one of the LEDs (mounted on a single aluminium post) visible at the left edge of the photograph. The cameras are positioned to the right, beyond the frame. Note that in the experiments reported here, the eaves were shut throughout and only mosquitoes reared in the laboratory from wild immature stages were tested