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. palpalis was seen around the ponies. The next village examined was 
Adagba, and between it and Lafian Yabba the River Uri, a small stream running 
through a kurimi, was crossed. Here also G. palpalis 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. From Yabba to Chapa the country is very 
hilly, and there are numerous laterite outcrops, but onwards to Hji (also parallel 
with the river) the road is more level but very rocky. At Wada and Hji, G. 
palpalis was caught. From this point the road diverges from the river bank in 
the direction of Edzu.* Shortly after we had left the riverside, G. tachinoides 
was captured in more open country, while further on G. longipalpis was found 
(cf. the conditions obtaining at Baro, p. 329). At the town of Mama, (. palpalis 
again occurred, while here also were obtained several specimens of Mansonioides 
uniformis in the bush around the village. 
The next halt was made at the town of Evua. The country is much more 
open, and both G. tachinotdes and G. longipalpis were caught, while near Evua 
itself, which stands practically on the river, G. palpalis was obtained. Between 
KEvua 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 Hgba 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 appear in the dry season. 
The sandy banks are covered with long grass and only occasional clusters of 
* Mis-spelt Edza on the map. 
