984 ON THE SOMALI DIK-DIKS. 



country, more or less intersected by rivers and streams which drain 

 the great Arussi plateau ; this, the Ennia Galla country, is where 

 Erlanger's Dik-dik is found. 



The type specimen was obtained at Sheikh Hussein, which is 

 30 or 40 miles or so east of the edge of the plateau, while my own 

 specimen was obtained some 20 miles to the west of Sheikh 

 Hussein opposite the foothills of Mt. Abu el Kassim, on the south 

 bank of the river Wabi. 



So far as I am aware, these are the only two specimens recorded, 

 so that at present its limits must remain undefined ; but I fancy I 

 shall be fairly accurate in suggesting that its habitat probably 

 lies to the west of the Harrar-Ginir line, being r-eplaced to the east 

 of it by M. pkillipsi hci7'arensis and to the south by 31. sioaynei. 



Rhynchotragus guentheri wroughtoni Dr.-Br. 



I have now come to a very interesting subspecies, namely 

 a. guentheritv7^oughtoni. The only specimen recorded is the type, 

 which I obtained on the north bank of the Wabi River among the 

 foothills of Mt. Abu el Kassim. 



The presence of this svibspecies in a spot so far removed from 

 the natural habitat of the species can only be explained by its 

 having at some period or other found its way up the river Wabi, 

 which is one of the main tributaries of the Webi Shebeleh, which 

 flows through the vast area inhabited by R. guentheri. Its 

 darker coloration and large ears are probably accounted for by its 

 environment, namely the dense acacia bush on the banks of the 

 river ; the size and shape of its ears certainly point to this. 



I am inclined to think that this subspecies will only be found 

 close to the rivei', as both M. erlangeri and R. sioaynei ai'e to be 

 found within a short distance of it. 



EXPLANATION OP THE PLATES. 



Plate LV. 

 Fig. 1. Madoqva j)7iillipsi ffuhanensis. | Fig. 2. 31. pjiillipsi Jiararensis. 

 Fig. 3. Madoqwa jphiUi;psi. 



Plate LVI. 

 Fig. 1. Madoqua piacentinii. \ Fig. 2. Madoqua swaynei. 



