Fig. 3. Phonotaxis by female Requena verticalis to speakers placed left and right of the arena. Traces of movement patterns to each side have been overlaid to the right side with the speaker position shown on right of the arena. Tracing of paths of all females (paired and unpaired cases) as (left) a control unblocked condition, with the call at 82 dB measured at the centre of the arena, (centre) with spiracle blocked with cotton at 82 dB and (right) with spiracle blocked at 51 dB. The concentric circles are distances 30 cm and 60 cm from the centre, at which point the females were timed in their progress towards the speaker (see text).

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