The authors wish to thank Mr A. Torriani and Dr W. Lutz of Amboni Ltd. and Mr D.N. Niven and staff of May and Baker Ltd., UK, for continued support over the period of the study. Mr A. Swanson of May and Baker Ltd., Nairobi, provided great assistance in the planning stages, the Field Assistants at Mkwaja Ranch put much effort into data extraction and Mrs G. Maloba meticulously typed all drafts of the report. Drs D. Dame and D. Williamson of the US Department of Agriculture kindly supplied data from tsetse control studies at Mkwaja, and useful suggestions were made by Drs S.K. Moloo and N.K. Borowy of the International Laboratory for Research on Animal Diseases (ILRAD). Richard Stewart of ILCA provided editorial assistance. Finally, this analysis was entirely dependent on the excellent data recording planned and supervised over many years by Mr H. Ammann and Mr E. Blaser when in charge of Mkwaja Ranch.
