6 Acknowledgements.
We thank the editors and reviewers for their unequivocal contributions. We thank The Office of the President of Botswana, National Museum of Botswana (NMB) and De Beers Botswana Mining Company for the invitation to collect the material. We acknowledge the staff of National Museum of Gaborone (NMG). We also thank Dr S. Werner of the Ditsong National Museum of Natural History for granting us access to their collection. We also thank Dr S. P. Bester of South African National Biodiversity Institute for granting us access to their state-of-the-art Olympus DSX 110 digital microscope. We acknowledge Mr J. Claase and Mr D. Noeth from Wirsam Scientific and Precision Equipment (Pty) Ltd for granting us access to their Olympus microscopes. SM would also like to thank his PhD internal and external examiners.