In pursuing my studies of the genital armature of the tsetse-flies, I have been fortunate in securing some valuable and interesting material from various parts of the African continent which has enabled me to offer a further contribution on the specific characters of the recently discovered Glossina austeni, Newst., from British East Africa; to present a detailed account of the armature of the apparently rare G. fuscipleuris, Aust., and to clear up some doubtful points in regard to the structural details of the male genital armature in G. longipennis, Corti. Later I hope to be able to offer some further remarks on G. palpalis, R.D., especially in regard to the colour and structural variations existing in this species. Meanwhile I may here state, for the guidance of the student, that G. fuscipes, Newst., which was described by me as a distinct species, must sink as a well-marked race of G. palpalis.