While capturing triatomidaes in a shanty town on the Morro do Telégrafo (São Cristovão - GB) where the dwellings, in their great majority, are made of day or stucco, the authors were able to verify the following: 1) All of the samples captured were of the Triatoma rubrofasciata species. (De Geer, 1.773) . 2) Out of 170 domiciles examined, triatomidaes were found in 23. The smallest sample of triatomidaes per house was one and the maximum was 56. This last number was obtained in two consecutive captures in the same place. 3) Out of 115 samples captured, 8 were nynphs in the first stage, 15 were in the second, 10 in the third, 5 in the fifth, 11 in the sixth, 42 were adult males and 24 females. 4) Not one of the hemiptera examined was infectad by flagellates. 5) A precipitine test made in 17 bugs showed 15 positive results for human, one for rat and one for the pig and chicken blood.