. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 498 OTHER BLOOD-SUCKING FLIES Glossina palpalis (Fig. 236) is a large dark species with black- ish brown abdomen and with gray thorax having indistinct brown markings. This species is found over the whole of West Africa, from the Senegal River to Angola, and east to the upper valley of the Nile and the eastern shores of the central lakes (Fig. 231, \\\). Its range is thus nearly coincident with that of Gambian sleeping sickness. This species, more than any other except possibly G. tachinoides
. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 498 OTHER BLOOD-SUCKING FLIES Glossina palpalis (Fig. 236) is a large dark species with black- ish brown abdomen and with gray thorax having indistinct brown markings. This species is found over the whole of West Africa, from the Senegal River to Angola, and east to the upper valley of the Nile and the eastern shores of the central lakes (Fig. 231, \\\). Its range is thus nearly coincident with that of Gambian sleeping sickness. This species, more than any other except possibly G. tachinoides, which occurs around the southern border of the Sahara Desert, is dependent on the presence of water. Its natu- ral range is said seldom to exceed 30 yards from the edge of water, and the distance that it will follow animals or man is not more. Fig. 236. Glossma palpalis, carrier of Gambian and Nigerian sleeping sick- ness. X 4. (After Austen.) than a few hundred yards. Muddy, reedy sloughs or swamps are not frequented by this fly, but rather sandy- or gravelly- banked streams with abundant overhanging vegetation. In the rainy season the flies extend their range to headwaters which are dry during the remainder of the year and retreat again with the drying up of the water. It is feared that this species may sometime bridge the short gape between the headwaters of the Congo and the Zambesi, and become established along the latter river and its tributaries, carrying sleeping sickness with it. This fly probably feeds naturally on a number of different animals. Wild game, especially the Situtunga antelope, is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa C. (Asa Crawford), 1891-1958. New York, J. Wiley
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