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I am happy to express appreciation to Captain C. B. Galloway (I-C) USN, Director of U.S. Naval Medical Research Unit No. 3, and to his predecessors, Captain A. R. Higgins (M3) usn, a.nd Rear Admiral J. J. Sapero (M3) usn (Ret.) for their constant encourage.. ment in the preparation of this report.

For much assistance I am also indebted to nw first mentor in the study of ticks, Dr. J. Bequaert of the Museum of Comparative Zo'5logy, Harvard University.

The helpful hand of Dr. Gertrud Theiler of Onderstepoort, Transvaal, appears on many pages of this report. In many other. wise unmentioned ways she has been so cooperative that it is dif_ ficult to express appreciation in sufficiently glowing terms. Dr. Theiler has identified all the immature specimens listed in this report and has checked many adult specimens of difficult or questionable species. Many of the discussions of species in this report reflect conclusions Dr. Theiler has drawn from years of study

‘and her generous permission to utilize unpublished results of this experience.

Special attention should also be called to the wholehearted cooperation of Mr. 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 assistance.

To Mr. David J. Lewis, formerly of Wad Medani, Sudan, I am in.. debted for his graciousness in putting the Sudan Government collec... tions at my disposal and providing me with facilities for study while visiting there. Dr. R. Kirk, formerly Director, Stack Medical Research Laboratories, Khartoum, Dr. J. F. E. Bloss, for. mrly Assistant Director, Suian 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 especially grateful to Mr. J. T. R. Evans, formerly Director, Sudan

Veterinary Service, who canvassed his field officers for specimens for distributional records and who invited us to stdy parasitolo. gical aspects of the Jur Narrows Game.Eviction Project; to Mr. John Owen, formerly District Commissioner, Torit, for many courte. sies and a number of worthwhile specimens; to Mr. H. B. Lumoore, formerly Equatoria Veterinary Inspector, who was especially help. ful in providing ticks from livestock and facilities for obtaining additional such specimens; to Mr. T. W. Charley, formerly Tsetse Control and Reclamation Officer, Sudan Veterinary Service, our cooperative and indefatigable host on the trip to Jur Narrows;

to Mr. E. T. M. Reid and others of Mr. Chorley's staff (page 808) for special efforts to collect ticks and data; and to Bimbashi Hillory Hook, formerly of the Sudan Defense Force, for a nuber of fine specimens from a variety of big game.

Special acknowledgement is made to my assistants, Chief Hos. pital Corpsman Deaner K. Lawless, USN, and Mr. Richard Alison, for help in collecting specimens in 1948.

While studying collections at British Museum (Natural History)

I was the recipient of many kindness and courtesies from Mr. E. Browning and Dr. G. Owen Evans, for which hearty thanks are ex. pressed. The privilege of being permitted to identify literally thousands of unnamed African ticks in British Museum (Natural History) collections has provided excellent background material for many phases of this report.

In the course of this work, it has been our pivilege to have outstanding parasitologists and specialists review parts of the ma. nuscript and offer coments and suggestions. In addition to Dr.

G. Theiler, Miss J. B. Walker, Mr. Glen M. Kohls, and Dr. C. B. Philip, it is a pleasure to note the cooperation of Dr. P. C. C. Garnham of the London School of Hygiene and Tropical Medicine; Dr. G. E. Davis and Dr. W. Burgdorfer of the Rocky Mountain Lab. oratory (on Ornithodoros moubata); Dr. L. Delpy of Paris (on Hvalomma, in ear y stages of manuscript); and Dr. D. R. Arthur

of the University of London (on Ixodes). Dr. A. C. Chandler of Rice Institute and Commander T. K. Ruebush, Office of Naval Re.

search, kindly reviewed extensive parts of this report during its preparation.

Commander S. W. Handford of the NAMRU.3 staff, Miss J. B. Walker of the East African Veterinary Research Organization, and Mr. George Curtis Moore, Second Secretary of the American Embassy at Cairo, kindly provided their excellent services as editors. The thankless task of checking the bibliography was kindly under. taken by Dr. Edith W. Ware during a research tour sponsored by Dr. Henry Field, Coconut Grove, Florida.

Information on systematic names and other matters pertaining to hosts of ticks has been secured from prominent specialists: Dr. A. L. Rand, Chicago Natural History Museum, on birds; Mr. C. C. Sanborn of the same institution on bats; Dr. H. W. Setzer, United States National Museum, on other mammals; a.nd Mr. A. Love.ridge, Museum of Comparative Zoology, on reptiles. Dr. C.W. Sabrosky, United States National Museum, has kindly answered questions on several nomenclatorial problems that arose during the course of this work.

To Mr. R. Strekalovsky of Cairo University, appreciation must be expressed for the care with which he has prepared the illustrations in this report. It is also a pleasure to acknowl. edge the services of Miss Marcelle Boshi and Mrs. Mary Youalcim of Naval Medical Research Unit Number Three for their careful typing of the manuscript in its numerous preliminary forms, as well as in final form.

Although mast illustrations used in this work were prepared especially for it, a few have been copied from previous publica. tions with the permission of the authors or editors concerned. These are acknowledged in the title of each figure so obtained.

In the introductory section of the Bibliography, those per.

sons who have been of special assistance in securing literature for these studies are mentioned.

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I. WEST AFRICAN SUBREEION
A... Guinean Forest Province

1. Upper Guinea Forest District 2. Lower Guinea Forest District B... Guinean Savanna Province

3. Upper Guinea Savanna District 5. Southern Congo Savanna District 1.. Ubangi_Uelle Savanna District 6. Uganda..Unyoro Savanna District

II. EAST AND SOUTH AFRICAN SUBREGION C... Humid Montana District 7. Cameroons Montana District 8. Eastern Montane District I)... Sudanese Province 9. Sudanese Arid District 10. fixdanese Savanna District E... Northeast African Province 11. Abyssinian Highland District 12. Somali Arid District F._ Eastern and Southern Province 13, East African Highland District 16. Southeast Veld District

14,, Rhodesian Highland District 17. Southwest Arid District 15, East African Lowland District

Figure l
SUBDIVISIONS OF THE EZPHIOPIAN FAUNAL RKEION

As suggested by the range of many species and races of birds. These prove rather satisfactory for mammals and some other terres..

trial animals.
F1-em Chapin (1932), with the author's permission.
PLATE 1

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