The authors describe the results of an entomological study run in December 1994 in the little town of Bezaha (South-Western Madagascar). The observed entomological indexes are those of an intensive malaria transmission area. The authors suggest to organize a longitudinal entomological survey along with a clinical and parasitological study. They also point out the fact that they found two microfilariae Wuchereria bancrofti in an Anopheles funestus female.