1. Pierce, G. W., Songs of Insects (Cambridge, Mass., 1948).
2. Haskell, P. T., Insect Sounds (London, 1961).
3. Dumortier, B., in Acoustic Behaviour of Animals, edit. by Busnel, R. G. (Amsterdam) (in the press).
4. Pasquinelly, F., and Busnel, M. C., in L'Acoustique des Orthoptères, edit. by Busnel, B. G. (Paris, 1955).
5. Broughton, W. B., in Acoustic Behaviour of Animals, cited in ref. 3.