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Veterinary Service, who canvassed his field officers for specimens for distributional records and who invited us to study parasitological aspects of the Jur Narrows Game-Eviction Project; to Mr. John Owen, formerly District Commissioner, Torit, for many courtesies and a number of worthwhile specimens; to Mr. H. B. Luxmoore, formerly Equatoria Veterinary Inspector, who was especially helpful in providing ticks from livestock and facilities for obtaining additional such specimens; to Mr. T. W. Chorley, 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 number of fine specimens from a variety of big game.

Special acknowledgement is made to my assistants, Chief Hospital 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 expressed. 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 privilege to have outstanding parasitologists and specialists review parts of the manuscript and offer comments 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 Laboratory (on Ornithodoros moubata); Dr. L. Delpy of Paris (on Hyalomma, in early stages of manuscript); and Dr. D. R. Arthur O e University of London (on Ixodes). Dr. A. C. Chandler of Rice Institute and Commander T. K. Ruebush, Office of Naval Research, 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 undertaken 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; and Mr. A. Loveridge, 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 acknowledge the services of Miss Marcelle Boshi and Mrs. Mary Youakim 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 most illustrations used in this work were prepared especially for it, a few have been copied from previous publications 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 SUBREGION

A.- Guinean Forest Province
Upper Guinea Forest District 2. Lower Guinea Forest District

B.- Guinean Savanna Province

Upper Guinea Savanna District 5. Southern Congo Savanna District
Ubangi-Uelle Savanna District 6. Uganda-Unyoro Savanna District

II. EAST AND SOUTH AFRICAN SUBREGION

C.- Humid Montane District
Cameroons Montane District 8. Eastern Montane District

D.- Sudanese Province
Sudanese Arid District 10. Sudanese Savanna District

E.- Northeast African Province
Abyssinian Highland District 12. Somali Arid District

F.- Eastern and Southern Province
East African Highland District 16. Southeast Weld District
Rhodesian Highland District 17. Southwest Arid District
East African Lowland District

Figure l
SUBDIVISIONS OF THE ETHIOPLAN FAUNAL REGION

As suggested by the range of many species and races of birds.

These prove rather satisfactory for mammals and some other terrestrial animals.

From Chapin (1932), with the author's permission.
PLATE l

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