5 Manning, A., Animal Behaviour, 9, 82-92 (1961). 6 Ibid., 11, 116-120 (1963). 7Ewing, A. W., Animal Behaviour, 9, 93-99 (1961). 8Ibid., 11, 369-378 (1963). 'Pearce, S., Animal Behaviour, 8, 232 (1960), and unpublished. "Brncic, D., and S. Koref-Santibanez, Genetics, 49, 585-591 (1964). 11 Caspari, E., in Behavior and Evolution, ed. A. Roe and G. G. Simpson (New Haven: Yale, 1958), pp. 103-127....