Fig. 5. Frequency discrimination by Cicada barbara males. Each male was stimulated with six sinusoidal tones at 80 dB SPL and the time taken by males to respond was measured. The conspecific song at the same sound intensity was presented for comparison. The 6 and 9 kHz tones were the most attractive. Singing behaviour was frequently not induced with 3 and 15 kHz tones within 180 s. Values are means ± 95 % confidence intervals (N=14).