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Rhodnius prolixus, one of the most importantvector of Chagas’ disease in Venezuela, was ba-sically considered in this country as related to thedomiciliar transmission cycle (O Cova-Garcia etal. 1959 Publ Div Malariol 11: 209-253). In thesylvatic environment it was observed that this spe-cies was mainly adapted to palm tree crowns andnests of Mycteria americana . R. prolixus is a veryeclectic species feeding on marsupials, rats, birdsand reptilians. Moreover, it is agreed that the ad-aptation of R. prolixus to human dwellings was aconsequence of human colonization of the naturalfoci of Trypanosoma cruzi (F Pifano1973 ArchVenezol Med Trop Parasitol Med 5: 3-29).During a search for triatomids performed in anAtlantic rain forest area in Teresopolis, State ofRio de Janeiro, we collected a total of 23 speci-mens (2 adults and 21 nymphs) of R. prolixus fromwhich 13 were infected by T. cruzi . Eleven nymphswere found in the axils of Pteridophyta leaves; 2adults and 4 nymphs in leafages, probably opos-sum nests and 6 nymphs were collected on the trunkof palm-tree. Several eggs could be found in theaxils of 1 Pterydophyta (Fig. 1). The studied area, Granja Florestal, Teresopolis,can be characterized as a secondary rain forest withpoor human dwellings on the forests borders. Thelocal population live basically on small agricul-ture and hunting. Weekly searches were performedbetween September and March (1994-95) and in-cluded palm-trees, bracts of pteridophyta, bird andmammal nests, leafages and bromeliaceae. The collected insects were maintained in glassflasks, fed through a membrane (ES Garcia et al.1975 Rev Brasil Biol 35 : 207-210) and the nymphswere allowed to moult. Seven isolates of T. cruziwere obtained through inoculation of swiss micewith the feces of the infected bugs. Axenic me-dium derived metacyclic forms (10

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The Occurrence of Rhodnius prolixus Stal, 1859, Naturally Infected by Trypanosoma cruzi in the State of Rio de Janeiro, Brazil (Hemiptera, Reduviidae, Triatominae)