n and social conflicts in stingless bees and honeybees, Proc. R. Soc. loud. B 266. 379 384. Pint, C.W.W., Neumann, P. Hepburn. R.. hloritz. R.I.A.. Tautr. J.. 1999. Fgg viability and worker policing in honey bees. Proc. Natl. Acad. Sol. USA 101, 8649 8651. Queller. D.C.. 1992. A general model for kin