RESEARCH IN BRITISH WEST AFRICA. 203 
the abdomen, but the dark bands are not so sharply defined as in this species 
nor is the quadrilateral area on the first segment so definitely marked. 
Professor Newstead* has very recently made a study of the male genital 
armature of the various species of Glossina. In his paper, page 23, he points 
out that the form of the inferior claspers distinguishes the two species, palpalis 
and tachinotdes, Dissection of two of my specimens showed that the inferior 
claspers corresponded with the form described by Newstead for G. palpalis, and 
on the assumption that this is a specific character, I determined to relegate them 
to that species. At the same time, it must be borne in mind that they are far 
from typical palpalis as regards their external markings, and apart from the 
question of a local race they almost justify the establishment of a new variety. 
The road from Gassan to Kantaur lies through thin bush. Around Kantaur, 
which is a fairly large town, there is extensive cultivation and consequently a 
large amount of clearing. Shortly after leaving Kantaur, the road passes over 
a high rocky laterite plateau, covered with clusters of stunted bamboo growth. 
The descent to Manna is very steep and rocky. No blood-sucking insects of 
any description were seen on this trek, nor does the type of country seem in any 
way adapted for them. 
Fig. 9.—Beach at Lamin Koto, opposite MacCarthy Island. 
The time at my disposal being short, I found that it would be impossible for 
me to continue onwards on the north bank, so I thought it advisable to cross 
over to MacCarthy Island and work towards Bathurst on the south bank, 
especially as the Government steamer does not proceed further up-river during 
the dry season. For this purpose I pushed on to Lamin Koto, the north-bank 
ferry for MacCarthy Island. As the formation of the bank at Lamin Koto is 
very typical of many wharves on the upper river, I have given a photograph of 
it (fig. 9), and a short description may be useful and suggestive. The soil, for 
* Bulletin of Entomological Research. Vol, II, Part I. pp. 9 to 36. 
21367 B 
