RESEARCH IN SIERRA LEONE. 175 



stations, namely Kailahun and Dodo, which until last year formed part of 

 Liberia, were visited, but the inspection of another, namely Tisani, which is 

 further north, did not justify the time involved, as the Medical Officer in charge 

 there had already made a small collection of such insects. These include the 

 following : — Glossina palpalis, Hippocentrum trimaculatum, Tab anus ruficrus, 

 T. besti var. arbucklei, T. postacutus, Aust. i. 1., and two new species of 

 Haemaiopota. 



From Pendembu, the railway terminus, a wide, well-made road has been 

 constructed to Kailahun (Kanre Lahun) ; no blood-sucking insects were seen 

 along this road nor were any found at the station. One company of the West 

 African Frontier Force is quartered there ; the country is open and the lines 

 well laid out on high-lying ground. 



The next station visited was Dodo, and halts were made at Sandyallu and 

 Kengama. The road to Sandyallu is very hilly and is surrounded by dense bush ; 

 the valleys for the most part contain extensive swamps, where Hippocentrum 

 trimaculatum was abundant ; in fact, this is the predominant species in such 

 places in West Africa. In Sandyallu itself, the following species were caught : — 

 Tabanus besti and var. arbucklei, Haematopota sp. n., Ceratopogon sp. and 

 Simulium damnosum ; the last-named species was very troublesome at the river- 

 side, and Ceratopogon was abundant in the native houses. Auckmeromyia luteola 

 was also seen in numbers in the native town. 



The country between Sandyallu and Kengama consists of large rounded 

 granitic hills, bare or covered with grass ; the valleys are clothed either with 

 grass or dense bush. The only blood-sucking fly seen during this trek was 

 Chrysops longicornis. The eyes of this species are remarkable in their colouring. 

 The ground colour is metallic emerald green, but along the upper margin there 

 is a stripe of metallic coppery brown, while in the centre of the eye there is also 

 an irregular but definite area of the latter colour. 



Dodo is also an out-station of the West African Frontier Force ; it stands on 

 the River Key a, a tributary of the Mauwa, which eventually joins the Moa 

 north of Daru. Glossina palpalis is by no means uncommon along this stream, 

 and Stomoxys calcitrans frequents the town. It may be noted that cattle are 

 kept there. Auckmeromyia luteola was also caught at Dodo, but the natives did 

 not know of the floor maggot. 



From Dodo to Giema the country is moderately open ; at Giema G. palpalis, 

 Stomoxys calcitrans, Tabanus besti, and var. arbucklei were obtained. Onwards 

 from Giema to Gondema the country was more hilly and very heavily wooded. 

 Glossina fusca was caught at several places between these two towns and also at 

 the latter. Between Gondema and Bomaru the River Mauwa had to be crossed, 

 and there G. palpalis was found. At Bomaru the only blood-sucking fly seen 

 was Tabanus besti var. arbucklei. From Bomaru to Baiima, on the railway, the 

 country is densely wooded and there are numerous small rivers and swamps. 

 G. palpalis was very abundant at a moderately large river near Baiima, and 

 G. fusca was obtained in the more heavily wooded parts on the road. At Baiima 

 itself G. fusca and T. besti var. arbucklei were caught. 



The country now to be described lies to the west of the Moa River, and a 

 start was again made from Pendembu. Between this town and Manawa the 



