336 JAS. J. SIMPSON — ENTOMOLOGICAL 



true, as it was several times corroborated, to the effect that when the Emir of 

 Lapai, with nearly a hundred mounted attendants, visited this region, either 

 during the trip or immediately after returning to Lapai, every single horse died, 

 in all probability from trypanosomiasis. We continued to administer large doses 

 of mercury and arsenic daily to our ponies ; and much to the messenger's surprise 

 and, to some extent, dismay, they arrived in Derri in good condition, showing 

 no symptoms whatever of infection. 



From Guredi the road passes through numerous kurimis to the village of Zago, 

 where G. jMlpalis was seen around the ponies. The next village examined was 

 Adagba, and between it and Lafian Yabba the liiver Uri, a small stream running 

 through a kurimi, was crossed. Here also G. paljxilis occurs. After Lafian 

 Yabba, the road crosses a deep ravine by a small bridge. It being impossible to 

 take the ponies over this bridge, a detour had to be made through a pestilential 

 swamp of a very treacherous nature, in which the water, of a tomato-soup colour 

 and consistency, in numerous places was over three feet deep. This part would 

 be absolutely impassable in the rains. While leading the ponies through this 

 region we saw numerous tsetse, but for obvious reasons none were caught. At 

 the town of Yabba, G. palpalis was obtained. 



The trek from Yabba to Mama (near Eki) was a very important one, inasmuch as 

 three species of Glossina were caught. Fj'om Yabba to Chapa the country is very 

 hilly, and there are numerous laterite outcrops, but onwards to Eji (also parallel 

 with the river) the road is more level but very rocky. At Wada and Eji, G. 

 pcdpuUs was caught. From this point the road diverges from the river bank iu 

 the direction of Edzu.* Shortly after we had left the riverside, G. tachiiwides 

 was captured in more open country, while further on G. lonyipalpis was found 

 (cf. the conditions obtaining at Baro, p. 329). At the town of Mama, G. palpalis 

 again occurred, while here also were obtained several specimens of Mansunioides 

 uidformis in the bush around the village. 



The next halt was made at the town of Evua. The country is nmch more 

 open, and both G. tuchinoides and G. longipalpis were caught, while near Evua 

 itself, which stands practically on the river, G. palpalis was obtained. Between 

 Evua and Derri are situated the villages of Egba and Gerinya. The road from 

 Evua to Egba passes over high hills and through deep steep-sided ravines. 

 Some of these are very rocky and nearly 600 feet in depth, and are all but 

 impassable for ponies. Before Egba can be reached, about two miles of open 

 plain with an extensive marsh has to be traversed. The town of Egba stands in 

 the centre of this marsh, and is a very important market-place. It is on one 

 of the main Kano-Lokoja trade routes, and produce is brought here from Derri, 

 Baro, Lapai, etc. The road from Egba to Derri is practically level ; first it 

 passes through a kurimi alongside a large lake, which is probably a backwater 

 in the wet season ; then towards the Garara it skirts the end of the range of 

 hills already mentioned, and meets the river at Gerinya. This town is on the 

 main route to Kotonkerifi, and from it the road runs along the bank of the Garara 

 to Derri. In the kurimi referred to, G. palpalis was caught. At this part the river 

 is wide, shallow and slow-running, and several sandbanks ajjpear in the dry season. 

 The sandy banks are covered with long grass and only occasional clusters of 



* Mis-spelt Edza on the map. 



