58 SPOET IN THE EASTERN SUDAN 



it does not arrive and leave with the regularity of 

 the latter species, and it is a playful little creature, 

 whereas the ariel is decidedly sheep-like. I believe 

 that Heuglin's gazelle is closely allied to Gazella 

 rufifrons, and strongly suspect that they interbreed. 

 However, nothing resembling the Heuglin is to be 

 found on the Rahad, Binder, or Blue Nile. The 

 average weight is 55 Ib. 



The red-fronted gazelle, I believe, occurs on the 

 Settit, but I am even now uncertain whether speci- 

 mens that I secured were this species or Heuglin. It 

 is common on the Eahad. On the Galegu, Binder, 

 and Blue Nile it occurs, but is decidedly scarce. Its 

 habits are identical with those of Heuglin's gazelle. 

 The average weight is 60 Ib. 



The isabella gazelle is common in the valleys behind 

 Souakin, and throughout the route from Sinkat to 

 Kassala. It never goes in herds, but usually in small 

 parties. I believe that it never drinks, and it often 

 suffers extremely from maggots under the skin. It 

 is usually a most confiding little beast, probably 

 because one ordinarily rides a camel in its haunts, and 

 it is accustomed to see camels grazing. The average 

 weight is 45 Ib. 



The Abyssinian oribi occurs on the Settit, but is 

 rare below Hagar ul Zuruk. It is common on the 

 Rahad from Hawata upwards, and by no means rare 

 on the Galegu and Binder. It is also common on the 



