1. Behaviour and Genetics of Social Insects Lab; School of Biological Sciences A12; University of Sydney; Sydney NSW 2006 Australia
2. Department of Biology; York University; 4700 Keele Street Toronto Ontario Canada M3J 1P3
3. Honey-bee Breeding Genetics and Physiology Research Laboratory; USDA-ARS; 1157 Ben Hur Road Baton Rouge LA 70820 USA
4. ARC-Plant Protection Research Institute; Stellenbosch 7599 South Africa