THE MINOR ANTELOPES AND GAZELLES 345 
At this one particular spot — west of El Dueim— 
there runs, parallel with White Nile and 40 miles inland 
thereof, a narrow belt of land whereupon a hand’s-breadth 
of addra are found, flourishing in splendid isolation ! This 
segregated strip is but 10 miles in breadth. Before 
reaching it, never an addra is seen ; nor, after traversing 
its 10-mile extent, will another be met with for 150 miles 
to the westward!—that is, in winter. On the second 
day out from El Dueim the traveller reaches the solitary 
koppie known as Jebel Shuwei, and this hill marks the 
longitude of this narrow scribe whereon the addra dwells. 1 
The explanation of such facts—or of geographical dis¬ 
tribution generally—lies beyond the range of a field- 
observer (or of anyone else). 
Bush-Gazelles 
The red-fronted is the common gazelle of all the 
bush-country both of Blue and White Niles, ex¬ 
tending to the verge of the Northern Deserts. Nowhere 
really abundant, yet it is broadly distributed, usually 
in pairs or small groups—never in big herds such as 
one recalls in East Africa of its cousin, Thomson’s 
gazelle. 
Whilst up the Zeraf River in February 1914, I recog¬ 
nised at once a difference between the local gazelles and 
the ordinary red-front. These Zeraf gazelles showed a 
distinct white blaze on the forehead, between the horns, 
and the black lateral stripe appeared thinner and less 
conspicuous. That year, unfortunately, a little “scrap” 
was raging with some turbulent Nuers up the Zeraf and 
(though granted special permission to collect birds) we 
were forbidden to shoot the larger game. Hence I 
1 During the rainy season , Mr Butler tells me he has seen Addra 
scattered all along the desert-route from Jebel Shuwei to the Sahara. But 
when, in spring, these big gazelles retire therefrom, they still leave in 
“splendid isolation ” that 10-mile breadth of their kind which finds 
permanent quarters around Jebel Shuwei. 
