43 
DIARY NOTES ON THE TSETSE-FLIES OBSERVED DURING 
A JOURNEY DOWN THE ROVUMA RIVER, PORTUGUESE 
EAST AFRICA, 
ay H. T. BARRETT: 
Nyasaland Government Service. 
(Map). 
August 17th, 1910. Between Lupitanguo Pool and Namiwawa (1).* Bright 
day ; steady easterly breeze ; fly scarce, though present throughout journey ; 
more plentiful by pools in shade. Gonntey thickly wooded. Water 
plentiful. Buffalo country. 
August 18th. Between Namiwawa and Mawola streams (2). Fly scarce, 
apparently none near camp by Mawola stream. Old spoor of elephant and 
buffalo. Bright day ; steady easterly breeze. Thickly wooded country. 
August 19th. Caught six specimens in bush and trees fringing pools between 
Mawola stream and camping ground (3). Fine day, with occasional clouds. 
Fly numerous and bit incessantly. Buffalo and sable antelope country. 
Very thickly afforested with thin-trunked trees. Fly seem to come round 
the camp in cycles—that is to say, they swarm around for a time (10 minutes 
or so) and then for a time there are none to be seen. 
August 20th. Fly scarce though existent throughout. 
August 21st. Several specimens caught around the camp in vicinity of Lihuruhu 
stream, among trees and in dry river bed (4 & 5). Thick tree country. 
Game very scarce (only oribi seen) ; fly pestilential in numbers. 
August 22nd. The three flies collected were caught among the trees around the 
camp by pool (6). Bright day. Waterbuck and kudu present. No traces 
of buffalo, though lots of old elephant spoor. Fly numerous. 
August 23rd. Flies caught at camp on bank of Mtambiri stream (7). Dull 
morning and flies scarce though present. Abundant when sun shone at 
camp ; scarce near the water. 
August 24th. On banks of Walezi close to junction of Lushilingo with fovuma 
(8). Hlephant and buffalo country. Flies numerous. 
August 25th. Between Likaronga Hill and Rovuma (9). Tree country giving 
place to open plains. Flies fairly numerous. Sable, waterbuck, buffalo 
and elephant country. Day fine. 
August 26th. In vicinity of Rovuma-Lushilinga confluence (10). One specimen 
caught on bank of Lushilinga. Dull day. Flies present in grass country 
with thin scattering of stall thornless and almost leafless trees, but few 
seen. 
* Such numbers in the text refer to similar numbers on the map, indicating approximately 
i localities in which tsetse-flies were actually caught. 
