Until 1991, 38 snake species were recorded for the islands of Marajó and Mexiana, Pará State, Brazil. During the review of the reptile collections of the Museu Paraense Emílio Goeldi (MPEG), the snake fauna of these islands was analyzed and reidentified using the updated literature. All specimens analyzed were separated by sex, observing traditional systematic meristic and morphometric data. Eight more species were found to occur in the local fauna (Boidae: Corallus h. hortulanus. Colubridae: Atractus sp., Drepanoides anomalus, Helicops angulatus, Pseudoboa coronata, Thaeniophallus occipitalis, Thamnodynastes pallidus and T. strigilis). Three species had their occurrences confirmed: one Colubridae, Chironius flavolineatus, and two Elapidae, Micrurus filiformis and M. s. surinamensis. Two topotypes ofPsomophis joberti (Colubridae) have also been identified. To date, 52 snake species have been recorded for the local herpetofauna, distributed in five families: Typhlopidae (1.9%), Boidae (13.5% ),Elapidae (3.8%), Viperidae (7.7%), and Colubridae (73.1%).
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