xii INTRODUCTION 



to reproduce the two plates of butterflies which have 

 appeared in the Transactions for 1920. Many of the 

 observations on Insects have already appeared in the 

 publications of the Society, others in Bedrock, and some 

 of those on the Fossorial Hymenoptera in the Journal of 

 the East Africa and Uganda Natural History Society. 



Mr. A. L. Shephard, of the Tropical Diseases Bureau, 

 very kindly gave me references which were of great help 

 in the preparation of the chapters on Sleeping Sickness, 

 and thanks are also due to the Director, Dr. A. G. Bagshawe, 

 C.M.G,, in this matter. Dr. H. Eltringham most kindly 

 complied with a request for the use of his talent as a 

 draughtsman, and provided an original and humorous 

 drawing of an imaginary example of mammalian mimicry. 



To my friend and mentor, E. B. Poulton, F.R.S., 

 Hope Professor of Zoology at Oxford, I owe more than 

 I can say for his ever ready advice and encouragement, 

 for his kindness in writing the Preface, and in 

 particular for reading the MS. of Chapter XI, and 

 suggesting improvements therein. To him and Dr. S. 

 A. Neave are due the selection and arrangement of 

 specimens illustrating by two plates forms of Pseudacraea 

 eurytus and their models. Dr. Karl Jordan, of the Tring 

 Museum, was most kind in showing me Lord Rothschild's 

 collection of this wonderful species, including a unique 

 specimen of a new form which shows the geographical 

 range to extend further southwards than has been 

 known hitherto. 



G. D. H. C. 



