144 J. B. DAVEY — 



Nature of the Country, 



In all the places, excepting one referred to below, there is abundant shade- 

 and, in most, there is a considerable growth of creepers in addition to the 

 usual young forest trees ; it was observed that the G. fusca were most 

 numerous under the largest trees. There is water close at hand in all cases ;, 

 in the lake districts G. fusca was usually found within six hundred yards of 

 the lake and, at more than one place where G. morsitans was also found, one 

 noticed that the latter occupied the country further from the lake than 

 G. fusca ; on one occasion, however, both were caught within a few yards 

 of one another. 



At one place in Marimba district a single specimen of G. fusca wan caught 

 about 7 A.M., a few yards from the lake, amongst some " bango '' reeds, and, 

 at this place, there were but three or four stunted trees within a mile of the 

 lake, the country being open grassy plain. 



On another occasion a single specimen was caught settling on the finger 

 of a native standing under a tree in the middle of a small village, the huts 

 composing which were somewhat scattered amongst palms and other trees. 



All the localities in which G. fusca was found are relatively low-lying, 

 Masinjiri's being about 300 and the lake about 1300 feet above sea-level. 



Time of Activity. 



G. fusca is extremely difficult to find, except in the evening and very early 

 morning. About 4 p.m. it seems to emerge from its hiding place and settle 

 on dried leaves, sticks or dust on paths, apparently lying in wait for a meal. 

 I have noticed that game, on its way to water in the evening, often stands 

 for a time on emerging from the forest on to a path, and would thus afford 

 the fly an opportunity for feeding. As a rule, G. fusca seems ready to bite 

 human beings in the evening, but it does not set to work with the rapidity 

 and voracity that G. morsitans often exhibits. I have noticed, as did also 

 the natives with me, that both G. morsitans and G. fusca often preferred to 

 settle on my kakhi shirt rather than on the bare legs or back of the native, 

 but the former, when in a voracious mood, would settle direct on some bare 

 part of myself or a native and begin to bite almost immediately. 



In the very early morning G. fusca has been observed flying about and 

 apparently taking its departure to its day haunts. 



At Kaporo, where G. fusca is fairly numerous, I succeeded, after some 

 trouble, in finding it in the middle of the day. It then was resting on tree- 

 trunks, 2 or 3 feet from the ground, and was difficult to detect and capture^, 

 as it selected trees surrounded by creepers and undergrowth, and hid away 

 in crevices in the bark or under the origin of branches. It appeared to rest 

 motionless until disturbed, when it quickly flew round to the other side of 

 the tree or to an adjoining tree, never going far, and making no attempt to 



