240 W. A. SANDS 



AMNH did much to facilitate the loan of Dr Emerson's material, and him too I 

 wish to thank. 



Secondly I am grateful to Dr W. G. H. Coaton, of the Plant Protection Research 

 Institute, Pretoria, for once again responding with great generosity to my request 

 for material and the loan of types from the Fuller collection. 



I am also indebted for material and valuable information on internal anatomy 

 and phylogeny to Prof. Dr C. Noirot of Dijon University. Other collections of 

 great interest have been received from Dr E. Ernst of the Swiss Tropical Institute, 

 Basle, Prof. Dr Fr. A. Bouillon and Prof. Dr Fr. J. E. Ruelle, both of Lovanium 

 University, Kinshasa, and Mr M. G. Bingham of Lusaka. To all of these specialists 

 in termite research I am most grateful. 



My thanks are also due for loans of type-material to Prof. Dr H. Tremblay of the 

 Istituto di Entomologia Agraria 'Filippo Silvestri', Portici, Naples, and to Dr 

 Gunnar Hallin of the Naturhistoriska Riksmuseum, Stockhom. 



For advice and help in carrying out the various multivariate statistical analyses 

 I further wish to express my gratitude to Mr J. N. R. Jeffers of Merlewood Research 

 Station, Grange-over-Sands, Lanes, Mr J. C. Gower of Rothamsted Experimental 

 Station, Harpenden, Herts, Dr K. Boratynski and Mr R. G. Davies of Imperial 

 College, London, and Dr C. Wilkinson of Portsmouth Polytechnic, Hants. 



I wish to thank Dr W. V. Harris, Officer-in-Charge of the Termite Research Unit 

 until his retirement in 1969, for help and advice throughout the progress of this 

 revision. 



Finally, my thanks are also due to the Trustees of the British Museum (Natural 

 History) for permission to examine types and other material in the termite collection. 



