The monthly diversity from february to october 1984, of families of butterflies in Pedrinhas, situated in São Luís Island, State of Maranhão, Brazil, was estimated by using the Shannon-Weaver diversity index. The results show high diversity of the Nymphalidae, Pieridae, Heliconiidae and Hesperiidae families. The authors also list the especies of butterflies, their monthly abundance and their distribution in the area.
KEY-WORDS:
Diversity; butterflies; State of Maranhão; Brazil.
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