. Bulletin of entomological research. Entomology. 12 J. W. SCOTT MACFIE—THE DISTKIBUTION OF GLOSSINA In many parts there is thick bush, and the tsetse-flies are very numerous, either of which circumstances might deter the Fulani from leading their herds here to graze; moreover, the more easterly districts would be reached most naturally from the north, when a wide stretch of country infested by G. submorsitans would have to be crossed. There is no doubt, however, about the fact that infection with T. brucei can be incurred in this division, and the experience of successive Residents has been t
. Bulletin of entomological research. Entomology. 12 J. W. SCOTT MACFIE—THE DISTKIBUTION OF GLOSSINA In many parts there is thick bush, and the tsetse-flies are very numerous, either of which circumstances might deter the Fulani from leading their herds here to graze; moreover, the more easterly districts would be reached most naturally from the north, when a wide stretch of country infested by G. submorsitans would have to be crossed. There is no doubt, however, about the fact that infection with T. brucei can be incurred in this division, and the experience of successive Residents has been that the ponies they use on tour in the eastern districts almost invariably die. Game is fairly plentiful in certain parts of the division, as it is in the eastern or Patigi division, whereas it is scarce in the western division; and it is possible, therefore, that trypanosomiasis may be maintained, in this instance, by infected game, and transmitted from them to any horses or cattle that venture into the Fig. 4.—Plan of Offa, (A) being the tsetse-haunt. At Offa itself, which is not only a large native town, but also an important station of the railway, only G. palpalis was found. On the western side of the line lies the native town, and on the eastern the residential quarters for Europeans ; on the latter side the ground rises gently and at the foot of the slope a small stream runs northwards in a direction parallel to the railway. The sloping ground is divided in two places by narrow valleys, on the ridge between which the Residency stands, and but a little way to the south lies an isolated patch of marshy ground from which originates a small stream. When I visited Offa, in April 1912, this patch of marshy ground (marked A on the plan) was covered with trees and undergrowth, and was found to be the haunt of abundant tsetse-flies (PI. Ill, fig. 1). The rest of the station was sparsely wooded and apparently free from these insects ; but as I was assured that
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