1. Zoology Department, University of Cape Town, Rondebosch 7701, South Africa
2. E.P. 90 CNRS, Laboratoire d'Entomologie, Muséum National d'Histoire Naturelle, 45 rue Buffon, F–75005 Paris, France
3. Institute for Physiological Chemistry and Pathobiochemistry, D–55099 Mainz, Germany