448 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



ties indicated by italics were either not to be found on any maps 

 available, or would overlap locality dots on the distribution maps. 

 Abbreviations designating other collections examined are: AMNH, 

 American Museum of Natural History ; BM, British Museum (Natural 

 History); and MC'Z. Museum of Comparative Zoology at Harvard 

 College 



l^idess otherwise stated, all measurements are in millimeters and the 

 capitalized color terms are from Ridgway, "Color Standards and Color 

 Nomenclature," 1912. It will be noted that in some accounts total 

 length is used and in others length of head and body. This has been 

 dictated by the type of measurement recorded by the collector on the 

 original label. No effort has been made to translate the total length 

 into length of head and body and tail length, since it is probable that 

 the two measurements would not be comparable. 



I would like to express my sincere thanks to the many individuals 

 who have aided in the preparation of this report; especially to the 

 members of the Mammal Room of the British Museum and to Dr. 

 H. W. Parker, its head keeper who so kindly allowed me to incorporate 

 specimen records and to describe new forms in the mammal collection; 

 to Miss Barbara Lawrence of the Museum of Comparative Zoology at 

 Harvard for the privilege of describmg new material in that collection; 

 to Colin Campbell Sanborn and the officials of the Chicago Natural 

 History Museum for making their Sudan collection available for study 

 and for the privilege of describing new kinds; to the Office of Research, 

 Medical Department, United Slates Navy, and to Naval Medical 

 Research Unit Number Three, who made possible the collecting of the 

 material and furnished transportation to England so that I might be 

 able to study the material housed at the British Museum (Natural 

 History) ; to the director of the United States National Museum and 

 to mj^ associates in the division of mammals who have aided in many 

 ways, to Mrs. Aime Awl, staff artist of the department of zoology who 

 so kindlj" prepared the maps, and to Mrs. Helen Gaylord who has 

 typed the manuscript through its many drafts. 



The Anglo-Egyptian Sudan lies roughly between 3° and 22° north 

 latitude and between 23° and 37° east longitude. Its geographic 

 boundaries encompass approximately 967,500 square miles of territory 

 having quite diverse topography. Almost the entne northern half of 

 the country is extreme desert, while the southern half is predominantly 

 savanna interspersed with isolated mountain masses such as the Jebel 

 Marra, the Nuba Mountains, Mount Baginzi, and the Imatong, 

 Didinga, and Dongotona Mountains in the southeast. 



The most conspicuous topographic feature of the Sudan is the Nile 

 River with its tributaries — the Atbara, the Blue Nile, the Sobat, and 

 the White Nile, each with a complex drainage sj'stem. In general, the 



