We thank L.M. Sullivan for making the recordings of U. crassicornis males, and M.F. Claridge, G.D. McNett and R.L. Rodriguez for comments on the manuscript. We also thank M.F. Claridge for providing recordings of Tettigarcta, and T.M. Jones, G.K. Morris and P. DeVries for providing size information on insects whose signals they have described in the literature. Financial support during preparation of this manuscript was provided by an NSERC graduate fellowship to P.A.D and NSF IBN 0318326 to R.B.C.

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