Bionomics of the vectors of onchocerciasis in the Ethiopian geographical region.

Of the two proved Simulium vectors of onchocerciasis in Africa, the more widespread and the easier to identify is S. damnosum. The identity of S. neavei is less easily established, and a summary of the present position regarding the S. neavei complex is given. The bionomics of the immature stages and adult females of S. damnosum and S. neavei are discussed in detail, and consideration is also given to the relation of each species to disease. Distribution maps are included.