WATEK-SHED OF THE WESTERN NILE TRIBUTARIES. 297 
THE COLOBUS GUEEEZA. 
directed soutli ; because, at the same time that the head waters of 
these western Nile tributaries flow north, the southern fall is 
directed to the east and west.^'’ 
During our frequent visits to the beautifully wooded river-banks, 
Petherick upon several occasions shot some really handsome 
monkeys. For a scientific description I must refer the reader to 
the admirable work of Dr. Piippell on the fauna of Abyssinia, who 
names it Colohus guereza” and describes it as a distinct species, 
