7 
were, however, one or two hot days (maximum g6°F), and while at 
the Falls there were a couple of severe thunderstorms. 
From Stanley Falls the route lay south through the equatorial 
zone towards Kasongo where the rainy season had already set in 
Frequent showers and thunderstorms were encountered on the way 
up river. The weather was pleasantly cool, the temperature varying 
usually between 82° and yi°F. 
From November to April there was much rain at Kasongo 
(December, 2 16*3 mm.). The temperature meanwhile varied between 
68° and 85°F. The march overland from Kasongo to Lusambo in 
May and June was made during the commencement of the dry season 
Rain fell but rarely, the temperature became higher and its daily 
variation greater. Streams and swamps dried up rapidly, and by the 
end of the first week in May the prairie grass was often dry enough 
to burn. 
Rain fell only twice during the stay of the expedition at Lusambo. 
By referring to this synopsis of the weather encountered by the 
expedition the climatic conditions under which the insects, described 
in this report, were collected may be easily ascertained. 
In the case of a post at which a long stay was made the month in 
which the specimen was obtained has been specified. To facilitate 
the finding of places in the map, the names of localities at which 
specimens were collected are always mentioned in the order in which 
they were visited. 
A certain number of insects were sent to the expedition from 
places it left unvisited. In referring to these specimens the name of 
the collector and, when possible, the date of capture are given. 
A considerable number of flies, collected in the British Colon) • >t 
the Gambia* and in French Senegal, were taken, together with certain 
drawings and observations referring to them, to the British Museum 
on the return of the expedition of the Liverpool School of I ropica 
Medicine to Senegainbia in July, 1903. 
At the end of 1905 these insects had not been described by the 
British Museum authorities. It was therefore requested that they 
should be returned to the Liverpool School. While at the Museum. ■> 
considerable part of the collection had unfortunately been mislaid 
* For a map showing the localities mentioned in the Gambia, see Men t« ' 1 ; 
the Liverpool School of Tropical Medicine. 
