This species, like Trypanosoma brucei , is markedly dimorphic. In size and general appearance also these two species so closely resemble one another that one might easily believe them to be varieties of the same species. There are, however, some slight differences in morphology, which will be described below; but whether these differences will bear the test of more extended observations remains to be seen. It may be noted that the trypanosomes described come from Uganda, and are not mixed up with strains from the Congo or Rhodesia. A. Living, Unstained.Trypanosoma gambiense also resembles Trypanosoma brucei in having little or no translatory power when viewed alive in the field of the microscope.