Glossina --see Tsetse-Fly) the distribution of a genus is limited to a continent.
Animals suffer from the ravages of bot flies (Oestridae) and gad flies (Tabanidae); while the tsetse disease is due to the tsetse fly (Glossina morsitans), carrying the protozoa that cause the disease from one horse to another.
TSETSE-FLY (Tsetse, an English rendering of the Bantu nsi-nsi, a fly), a name applied indiscriminately to any one of the eight species of Glossina, a genus of African blood-sucking Diptera (two-winged flies, see Diptera), of the family Muscidae.
For practical purposes the northern limit of Glossina, as at present known, may be shown on the map by drawing a line from Cape Verde to the Nile a little to the south-east of El Obeid, and thence to the coast of Somaliland at 4° N; while the southern boundary of the genus may similarly be represented by the Cunene river, in the south of Angola, and a line thence to the north-eastern end of St Lucia lake, in Zululand.
It is important to note that although sleeping sickness (of which the chief foci are at present the Congo Free State and Uganda) has hitherto been associated with one particular species of Glossina, it has been shown experi mentally both that other tsetse-flies are able to transmit the parasite of the disease, and that G.
Since, moreover, it is believed that at least five species of Glossina are carriers of nagana, it may well be that all tsetse-flies can disseminate both nagana and sleeping sickness.
Soc. (1907), 79 B, p. 35 .; (41b) idem (with Gray and Tulloch), " Glossina palpalis in relation to Trypanosoma gambiense," &c., op. cit.