GLOSSINA FUSCA IN NORTH NYASA. 



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only, viz. : — in the early morning and in the evening ; between 8 a.m. and 

 4 p.m. their presence would be entirely unsuspected, though an isolated 

 specimen might be caught after very careful search. They were found 

 during the day under leaves of bushes or in the grass, always near the ground 

 (cf. fig. 2). They continued to bite and could be heard flying about for 

 some time after dark. At these times, the morning and evening, they were 

 frequently present in large numbers, and 20 to 30 specimens could be caught 

 with one net in the course of an hour. Two specimens were caught in coitu ; 

 they were found on the trunk of a large tree, at a height of about 4 feet, at 

 about 5 o'clock the evenino-. 



Fig-. 2. — Tl.e narrow, dried- up bed of the Mawerela Stream, showing- ho^A' it is overgrown 

 with dense bush, in the deep shade of which Glossina fusca is found during the day. 



At a village on the Ponga stream (6) the cattle were found to be infected 

 with trypanosomiasis, suggestive of Nagana, the trypanosomes having the 

 morphological characters of Trypanosoma hrucei. G. fusca was found in 

 exceptionally large numbers, and two specimens were caught in the hut in 

 which an infected cow was lying, and which was also the living-place of its 

 owners. This is the only time that I have succeeded in finding the fly 

 actually in a village. I hope to investigate this trypanosomiasis later on. 



The grass and scrub in this part of the country is burnt in November and 

 December. 



The flies i bite through dark clothes, but have never been seen to settle on 



