n 



ACKNOWLEDGEMENTS 



I am happy to express appreciation to Captain C. B. Galloway 

 (LC) USN, Director of U.S. Naval Ifedical Research Unit No. 3, and 

 to his predecessors, Captain A. R, Higgins (^C) USN, and Rear 

 Admiral J. J. Sapero (MJ) USN (Ret.) for their constant encourage- 

 ment in the preparation of this report. 



For much assistance I am also indebted to m^ first mentor in 

 the study of ticks. Dr. J, Bequaert of the Museum of Comparative 

 Zo'iSlogy, Harvard University, 



The helpful hand of Dr. Gertrtid Theiler of Onderstepoort, 

 Transvaal, appears on many pages of this report. In many other- 

 wise vmmentioned ways she has been so cooperative that it is dif- 

 ficult to express appreciation in sufficiently glowing terms. Dr. 

 Theiler has identified all the immatiu'e specimens listed in this 

 report and has checked many adult specimens of difficult or ques- 

 tionable species. Many of the discussions of species in this re- 

 port reflect conclusions Dr, Theiler has drawn from years of study 

 and her generous permission to utilize unpublished results of this 

 experience. 



Specieil attention should also be called to the wholehearted 

 cooperation of l-tr. Glen M, Kohls of the Rocky Mountain Laboratory 

 who since the beginning of this work has spent many hours in re- 

 viewing this manuscript and offering valuable comments. During 

 two periods of study at his laboratory, Mr, Kohls provided me with 

 every aissistance. 



To Mr, David J, Lewis, formerly of Wad Medani, Sudan, I am in- 

 debted for his graciousness in putting the Svidan Government collec- 

 tions at my disposal and providing me with facilities for study 

 while visiting there, Dr, R, Kirk, fornerly Director, Stack 

 Medical Research Laboratories, Khartoum, Dr, J. F. E. Bloss, for- 

 merly Assistant Director, Sudan Medical Service, and numerous 

 other persons in the Sudan have been most generous in providing 

 assistance of various kinds for work in that country. I am espe- 

 cially gratef\il to Mr. J. T. R. EVans, fornerly Director, Sudan 



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