TRYPANOSOME OCCURRING IN THE BLOOD OF MAN 467 
Dr. Laveran, who has very kindly examined some blood films taken from the 
patient wrote to me that if the morphological characters are alone considered he would 
regard my specimen as a new species ; it is smaller than T. lewisi (24 to 25 m), 
T. brucei, (26 to 28 m) and T. equiperdum (25 to 28 //), and differs from T. brucei in 
length of the flagellum and by the small number of chromatin granules in the 
protoplasm. 
At present then it is impossible to decide definitely as to the species, but it on 
further study it should be found to differ from the other disease-producing try- 
panosomes I would suggest that it be called Trypanosoma gambiense. 
During the time 1 was in Bathurst I did not observe any symptoms occurring 
among the natives similar to those detailed above, but Dr. R. M. Lorde informed me 
sometime before I examined the patient that he had come across cases among the 
native boatmen presenting similar symptoms, oedema, etc. I examined the blood of 
some native sailors on the Government launch, some fourteen in all, with negative 
results ; all appeared healthy.* 
Specimens were very kindly collected for me of the mangrove flies by Mr. 
Batty, which are often very troublesome on board the launch. I also obtained a 
few specimens on my journey up the river. Two varieties were caught, a large 
one, which Mr. Theobald identified for me as Tabanus dorsovitta, Welka. The 
small one turned out to be a species of tsetse, Glossina longipalpis, Wiedermann 
var. Facbifioides, Westwood. The patient informed me that these small mangrove 
flies are very troublesome on the launch during the hot months — June, July, 
August — and that he himself had suffered frequently from their bites. 
This species of Glossina has been seen by Mr. Austen in Sierra Leone, 
and specimens have been brought from Asaba on the Niger ; by Dr. Cross it 
appears to have a wide distribution in West Africa. 
* Since going to press I have lately examined a series of one hundred and fifteen films obtained from native children 
(one to fifteen years of age), which I brought home for the purpose of estimating the prevalence of malaria in the Gambia. 
In one preparation of blood taken from a child three years old, I found trypanosomes present. In the smear three 
parasites were counted, presenting identical characteristics ; size, shape, staining reaction, and position taken up on slide ; to 
the parasite described occurring in the blood of the European. 
Associateil with the trypanosomes were a few ring forms of malaria parasites. 
The child was one of a batch of fifty examined at a native village, seven miles from Bathurst, near the mouth of the 
river Gambia ; these children were to all appearances healthy. 
