79 
of gland palpation as a means of diagnosis so far as a country was 
concerned in which the disease was supposed to be non-existent. 
Most attention has been devoted to the Luapula division, as large 
numbers of natives from this district have worked in the Katanga, and 
as, in the natural course of events, it would be the first portion to be 
invaded. The other area from which the disease was expected to enter 
Rhodesia was along the border between Mweru and Tanganyika. As 
yet we have not been able to visit this part, but evidence is 
accumulating that the prediction made by Dr. Todd is in course of 
fulfilment. 
DISTRIBUTION OF TSETSE FLIES 
A. In North-Eastern Rhodesia. 
I. Glossina pal falls. In brief, we now know that this species 
exists along a large part of the Luapula and some of its confluents; 
on the shores of Lake Mweru; and around the southern end of 
Lake Tanganyika. 
It was first found in igoG by Dr. Noble at Kasenga and the 
Nafunta Falls on the Congo side of the Luapula. This year it was 
found by Dr. SpUlane along this river from Kapwepwi’s to Kasiwa’s 
village, and along the British portion of the two lakes. We have 
been able to confirm these observations as regards the Luapula. It 
was also found by Dr. Spillane for some distance up the Mansa and 
Kalungwisi rivers, and we have found it up the Luongo a short 
distance from its mouth. 
Along the portion of the river mentioned above, the bush extends 
right to the margin of the water, where it assumes a more luxuriant 
growth and affords abundant shade. From Chongola’s to Sakontwi, 
the river is bordered by wide flats almost completely destitute of 
vegetation. From Sakontwi to Kapwepwi’s the shore is fringed by a 
single, more or less continuous, row of bushes and small trees which 
project obliquely outward over the water. Behind this there is a 
bare, treeless strip of ground varying in width from 25 to 200 yards, 
and beyond this again the ordinary thin bush of the country begins. 
This lack of continuous shade behind the river and the small amount 
of shelter afforded by the fringe of bushes probably account for the 
absence of Gl. falfalls. From Kasiwa’s to Mweru, the conditions are 
