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Fig. 1. Spectra of male calls of five species of Neoconocephalus: (A) N. nebrascensis (N=10), (B) N. bivocatus (N=8), (C) N. robustus (N=10), (D) N. retusus (N=9) and (E) N. ensiger (N=3). The thick line represents the averaged spectrum of each species, while the thin lines denote the individual spectra contributing to the averaged spectrum. Spectra are calculated as fast Fourier transform (1024 points window length) averaged over 1 s.