A survey was made on the distribution of insect vectors of Chagas' disease in the State of Minas Geraes, Brazil. Triatomid bugs were found in 155 (39.94%) out of 388 counties of the State. In 94 counties the bugs were infected with Schizotrypanum cruzi. 14,978 triatomids were T. infestans (70,78%), 4,589 were P. megistus (21.68%) and 1,547 were T. sordida (7.31%). The other species (P. geniculatus, P. diasi., T. arthurneivai, T. maculata and Ps. coreodes) represented only 0.21 percent of the insects. 11,507 bugs were examined for S. cruzi and 3,007 (26.13%) were found infected.