THE VECTORIAL COMPETENCE BETWEEN GLOSSINA -PALPALIS-PALPALIS, GLOSSINA-PALPALIS-GAMBIENSIS AND GLOSSINA-MORSITANS MORSITANS BY A CLONE OF TRYPANOSOMA (NANNOMONAS) CONGOLENSE IL-1180

The authors report on the results of experimental infections of tenera l (age < 32 hours) and non-teneral (age between 80 and 96 hours) Gloss ina palpalis palpalis, G. p. gambiensis and G. morsitans morsitans wit h Trypanosoma congolense IL 1180. Flies were infected once on a parasi taemic rat. Teneral flies, both sexes indiscriminate, showed a procycl ic and metacyclic infection rate respectively of 0.0588 and 0.7272 for G. p. palpalis; 0,0525 and 0.0416 for G. p. gambiensis, 0.6493 and 0. 7300 for G. m. morsitans. Neither of the non-teneral G. palpalis subsp ecies had any vectorial competence, whereas G. m. morsitans had procyc lic and metacyclic infection rates of 0.4541 and 0.7884. Statistical a nalysis could not demonstrate any significant difference in metacyclic infection rate between teneral and non-teneral G. m. morsitans. Tener al flies of each subspecies transmitted the infection to rots, used as hosts, before the twentieth day. Concerning trypanosome development i n the fly, it was observed that five days after infection procyclic an d mesocyclic forms could be observed simultaneously in all flies disse cted at that moment.