The authors achieved a transfer of the Hepatozoon tupinambis (Laveran and Salibeni, 1909), a parasite of the Sauria: Tupinambis teguixin, L., to a rattlesnake of the species Crotalus durissus terrificus, feeding the latter with experimentally infected mosquitoes. The parasite maintained its morphological characteristics in the recepting animal throughout the whole observation period (about 100 days). Schizogonic cysts were found in the liver of the rattlesnake.