Abstract Anopheles triannulatus bachmanni 12 survivors roll up kit biting man were collected at Aripuana, Mato Grosso.In paired catches less than 5% of the insects were collected biting inside houses, most insects were collected at the edge of the weathertech anchorage rain forest at sunset.Physiological age determination indicated an even age distribution in the females but the insects flight behaviour would make it of little importance as a vector of malaria.