214 JAS. J. SIMPSON—ENTOMOLOGICAL 
distinct signs of infection and, when examined, was found to be suffering severely 
from trypanosomiasis, which was most probably contracted in this district. He 
was brought to England and is now, I understand, in the Veterinary Farm at 
Camden Town. 
Almost the same state of affairs holds good with regard to cattle ; a few may 
be seen in some of the villages, but in none are there large herds, such as may 
be seen in the other districts. This is due entirely to the fact that the rate of 
mortality is so high that the natives will not take the risk of importing them. 
Sleeping-sickness is also far from uncommon and, as already mentioned, the 
highest percentage for any village found by the Expedition of 1911 was at Essau, 
a village on the river bank in this Province. This area, therefore, being well 
circumscribed, is preeminently suitable for various lines of enquiry. It is practi- 
cally certain that trypanosomiasis is responsible for the mortality amongst the 
horses and most probably also amongst the cattle. It is not at all certain, how- 
ever, that the horses and cattle are infected with the same trypanosome, and 
further, the mortality amongst the latter might be due to a form of piroplasmosis. 
These points alone would justify the establishment of a temporary laboratory, 
but in addition to this, the question of reservoirs is an all-important one, and, in 
this region, ample scope could be found for such work, in fact it is not too much 
to say that practically every species of animal found in the Gambia, could be 
obtained here. 
We are entirely ignorant of the breeding places of Glossina in the Gambia, 
and no area could be more suitable for such an investigation than the Niumi 
Province. Consequently, to the Veterinary Surgeon who wishes to study the 
origin, cause, or treatment of protozoval disease in horses and cattle; to the 
Protozoologist who wishes to study the origin and transmission of trypanosomiasis 
in man; to the Medical Officer who wishes to follow the course and curative 
treatment of sleeping-sickness ; or to the Entomologist who is desirous of in- 
vestigating the habitats, life-history, and bionomics of blood-sucking insects and 
other arthropods, Niumi Province, so easy of access from Bathurst, opens up 
unlimited opportunities for research. 
VI. Recorps or BLoop-Suck1nGc ARTHROPODS FROM THE GAMBIA. 
The following list of blood-sucking arthropods has been drawn up to include, 
as far as possible, all previous records, and so render this report complete in this 
respect up to the date of publication. It will also serve to show how meagre 
our information on this subject is, in spite of the large number of species which 
occur in the Colony and their wide distribution, and may help to stimulate 
others to fill in the numerous blanks which at present exist. The records of 
Glossina made by the author are not included here, as they have already been 
detailed and may be seen at a glance on the appended map. The other records 
here given have also been included on the map, when the localities assigned to 
them have been definite enough to admit of identification. Apart from Glossina, 
however, all the other species collected by the author are included. ‘The generic 
names here given for the mosquitos are not those assigned to the various species 
