Six expeditions to the Ferreira Penna Scientific Station, in Floresta Nacional de Caxiuanã, Eastern Amazonia, Pará State, Brazil, were made between September 2001 to August 2002. Three sampling methods were used: time constreined search, pitfall traps with drift fence and opportunistic sightings. We add 21 taxa to current list of 42 species of snakes known from area: Epicrates cenchria cenchria, Atractus schach, Atractus sp. n., Chironius carinatus, Chironius exoletus, Chironius scurrulus, Dendrophidion dendrophis, Erythrolamprus aesculapii, Helicops leopardinus, Helicops polylepis, Helicops trivittatus, Hydrodynastes gigas, Oxybelis aeneus, Pseustes poecilonotus, Taeniophallus brevirostris, Rhinobothrium lentiginosum, Xenodon rabdocephalus rabdocephalus, Xenopholis scalaris, Bothriospsis taeniata taeniata, Micrurus hemprichii hemprichii and Micrurus surinamensis surinamensis.
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