Local pattern of domiciled and wild distribution of Panstrongylus megistus was observed through artificial and natural ecotopes investigation. The bug was found inhabiting periodomestic dwellings and hollow trees in the sylvatic environment serving as shelters for wild animals. This was mainly represented by spots of remaining forests. Colonization of experimental chicken houses was obtained suggesting that interchange occurs between natural and artificial ecotopes. So it seems suitable to atribute high ecological valence to this bug population.
Trypanosomiasis, South American; Pantrongylus megistus; Triatomids bugs; Medical ecology