318 .TAS. .1. SIMPSON ENTOMOLOGICAL 



are covered with long grass and thick low shrubs close down to the water's edge, 

 while behind this is a dense fringe of thick bush (PI. VIII, fig. 1). I went 

 ashore at several places, and everywhere G. tuehinoidcs swarmed, while in the 

 thick bush behind, one G. paljyalis was caught. 



For the last 800 yards before reaching Jebba, the river is enclosed in a narrow 

 gorge with almost vertical walls ; it is divided in two by the high steep-sided 

 " Jnjn " rock (PI. VIII, fig. 2), the current being both deep and swift, with 

 numerous eddies and whirlpools. 

 Jehha to Mureji. 



This journey was accomplished on the 11th of October in a very small steam- 

 launch. The nature of the vegetation on the river banks is very similar to that 

 around Bajibo. In some parts heavy bush predominates, and there Glossina 

 palpalis swarmed ; at other places where there is abundant grass and low shrubs, 

 G. tacldnoides was seen (PI. IX, fig. 1). 



At the town of Mureji itself, both G. palpalis and G. tacldnoides were caught. 

 On another occasion (August 16th) I visited this town, which is nothing more 

 than a few houses situated on a mud bank, so that at low water it stands a few 

 feet above the level of the river, but during the rains the various houses are 

 separated by deep channels filled by the rising river (PI. IX, fig. 2). Mosquitos 

 were abundant in August and by far the most frequent were Myzomyia costalis 

 and Sterjomyia fasciata. Tahanus tacniola and T. latipes were also caught at the 

 same time. The chief importance of this village lay in the fact that it is situated 

 at the junction of the Kaduna and the Niger, and all launches for Barijuko, the 

 Kaduna landing-place for Zungeru, took in fuel there ; but since the opening of 

 the Baro-Kano Railway, this route has been abandoned, and the only launches 

 which call there now are those plying between Jebba and Baro. 



On the river Kaduna, between Mureji and Barijuko, Tahanus tueniola and 

 T. latipes were the only blood-sucking files seen during my trip, but both G. 

 palpalis and G. tachinoides have been caught in this region, and these records are 

 shown on the accompanying map. 



Although I traversed the river between Mureji and Baro on two occasions, I 

 was unable to form any opinion of this part, as both trips were done by night. 

 Both G. palpalis and G. tachinoides have, however, been recorded from this 

 region (see map). The town of Baro has been discussed elsewhere, so requires 

 no mention here. The journey from Baro to Idah was made in a large stern- 

 wheeler, which is not nearly so satisfactory for entomological purposes, as it 

 seldom approaches close enough to the banks for flies to come aboard, and the 

 rate is also a deterrent to such intrusions. With the exception of several 

 Tabanus latipes and T. taeniola caught south of Baro and 7'. fasciatus near 

 Itobe, no blood-sucking flies were seen on the steamer. Both Glossina palpalis 

 and G. tachinoides, however, have been found on this stretch, and the localities of 

 these are also shown on the map. 



(J)) Lokoja. 



The town of Lokoja is, and always must be a very important commercial 

 centre, inasmuch as it is situated at the junction of the two large rivers, the 

 Benue and the Niger, and therefore commands the whole of the trade of the 



