﻿IN THE MONGALLA PROVINCE OF THE ANGLO-EGYPTIAN SUDAN. 91 



along these streams, both in the gorges and in the open, but did not once see a 

 G. palpalis, so am of the opinion that it does not exist there. Why this should 

 be I do not know. I found G. morsitans on one occasion in this locality, so the 

 absence of G. palpalis is probably not due to the altitude, which, I believe, is 

 not very great. 



In the southern part of the Lado District, south of khor Kair, the natives 

 have hitherto been unadministrated in the generally accepted sense of the word. 

 The Belgian Government originally had military posts at Wadelai, Gebel Wati, 

 Duflle and Kajo Kaji, but these had all been withdrawn prior to the country 

 being taken over by the Sudan Government. Even when these stations were 

 occupied, the various tribes and villages appear to have been continually at war 

 with each other, and as a result of this there was little or no intercourse between 

 them, and therefore comparatively little danger of a disease such as sleeping 

 sickness spreading from one locality to another. Now that the district is being 

 brought under control this state of affairs has already begun to change — e.g., 

 natives now wander freely from Kajo Kaji to Dufile, whereas a year ago they 

 would scarcely have ventured an hour's journey from their villages. The 

 importance in this change in the state of affairs is obvious. G. palpalis exists 

 on many if not all of the inland khors, and it appears to me that there is a grave 

 danger of the " fly " on these khors becoming infected with Trypanosoma 

 gambiense. During my journey through this southern part of the Lado District 

 I saw no native who appeared to be suffering from sleeping sickness and I 

 believe that as yet this disease is non-existent there, though in this I may very 

 possibly be mistaken. Sleeping sickness exists on the east bank of the Nile 

 opposite Sudan territory. There are chiefs who claim villages on either bank of 

 the river in the neighbourhood of Wadelai and naturally it is a common thing for 

 natives to cross from one bank to the other. North of khor Kair, though some 

 distance from it, lies Yei, the centre of the infected area in the northern part of 

 the Lado District. It can be understood therefore how easily sleeping sickness 

 might be carried inland to the country south of khor Kair and the fly there 

 become infected. I would like to draw attention to the advisability of Medical 

 Inspectors being sent at once to this southern part of the Lado District, to 

 ascertain whether sleeping sickness does as yet occur there, so that in the event 

 of their failing to find it, steps may immediately be taken to prevent its 

 introduction. 



I believe it is as yet unknown whether G. 'palpalis can act as an agent in the 

 spread of that form of trypanosomiasis among animals known as " nagana." As 

 I have shewn on the accompanying map, I found very few G. morsitans south of 

 khor Kair, and certain localities appeared to be quite free from this fly. In 

 these localities — e.g., the neighbourhood of Gebel Wati — there is a considerable 

 number of cattle, and from the condition of these animals when I saw them, I am 

 led to believe that, at any rate, some of these districts are well suited for cattle- 

 raising. In view of the chance that G. palpalis may eventually prove to be a 

 host of Trypanosoma brucei I would suggest that the introduction into those 

 parts of the Lado District where nagana does not as yet exist, of animals known 

 to have passed through a nagana infected area should be prohibited. 



