1. D.F. Owen and D.O. Chanter, Revue Zool. Bot. afr.78, 81 (1968).
2. M. Rothschild, J. von Euw, T. Reichstein, D.A.S. Smith and J. Pierre, Proc. R. Soc.B190, 1 (1975).
3. D.A.S. Smith, Biol. J. Linn. Soc.8, 183 (1976).
4. N. Marsh, C.A. Clarke, M. Rothschild and D.N. Kellett, Nature268, 726 (1977).
5. L.P. Brower, M. Edmunds and C.M. Moffitt, J. Ent.A49, 183 (1975).