FIGURE 11.1 Polytene chromosomes from larval silk glands of the black fly Twinriia majjadmsis.

vector of the agent of human onchocerciasis or river blindness, consists of as many as 40 distinct species, not all of which are vectors of the pathogen. The existence of homosequential sibling species that are identical in both morphology and chromosomal banding patterns increases the taxonomic complexity of the family. Cyto-taxonomy of black flies has been reviewed for the world fauna (Rothfels, 1979) and for some vector species (Procunier, 1989).

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