. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 492 OTHER BLOOD-SUCKING FLIES. Fig. 230. pygium o f tsetse fly. Alcock.) Hypo- male (After mouthparts when the latter are not in use, and it is thus the palpi alone that are seen when the long blunt-tipped proboscis is ob- ; The characteristic form of the antennae is shown in Fig. 229. The thorax is relatively large and quadrangular, with a characteristic pattern which is, however, inconspicuous in some species. The abdomen may be nearly uniform dark brown, or pale brown banded with a dusky
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 492 OTHER BLOOD-SUCKING FLIES. Fig. 230. pygium o f tsetse fly. Alcock.) Hypo- male (After mouthparts when the latter are not in use, and it is thus the palpi alone that are seen when the long blunt-tipped proboscis is ob- ; The characteristic form of the antennae is shown in Fig. 229. The thorax is relatively large and quadrangular, with a characteristic pattern which is, however, inconspicuous in some species. The abdomen may be nearly uniform dark brown, or pale brown banded with a dusky color. The male has a large oval swell- ing on the under side of the last segment of the abdomen, the " hypopygium " (Fig. 230), which forms a good distinguishing mark be- tween the sexes. Distribution, Habits, etc. — Tsetse flies, fortunately, are lim- ited in their distribution to the middle portion of the African continent from south of the Sahara Desert to the northern borders of British South Africa (Fig. 231, = ). One species occurs in the southwestern corner of Arabia. Tsetses are bj^ no means evenly distributed over this great area, but are limited locally to "fly-belts," chiefly along rivers and at the edges of lakes. All the factors which cause the " patchy" distribution of tsetses are not known; there are cases where close Umita- tion to certain areas cannot be explained by any known requirements of the flies. Different species vary in their choice of habitats; Glossina palpalis (Fig. 236), the carrier of Gambian and seldom found more than 30. 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 Crawford, 1891-. New York, J. Wiley
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