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Este trabalho teve como objetivo obter dados sobre a ecologia da nidificação de Centris (Hemisiella) tarsata Smith em três ecossistemas: mata ciliar (MC), mata mesofítica (MM) e eucaliptal (EC), utilizandose ninhos-armadilha confeccionados em gomos de bambu, distribuídos em diferentes alturas: 1,5 m e 5-12 m do solo. Foram obtidos 41 ninhos: 31 no EC e 10 na MM, a maioria no estrato superior e com maior freqüência de nidificações ocorrendo no período de estiagem. A razão sexual foi de 1,9:1 (fêmeas/ machos) no EC e de 1,08:1 na MM. Cerca de 22% dos ninhos do EC e 40% da MM foram parasitados por Mesocheira bicolor (Fabricius, 1804) (Hymenoptera, Apidae) e Coelioxys sp. (Hymenoptera, Megachilidae). A análise polínica revelou predominância de grãos de pólen de Banisteriopsis sp. (Malpighiaceae) e Cassia sp. (Caesalpiniaceae) no EC e de espécies de Caesalpiniaceae Kunth. e Banisteriopsis Robinson na MM. This work had as objective to obtain ecological data of Centris (Hemisiella) tarsata Smith's nidification in three ecosystems: riparian forest (MC), mesophitic forest (MM) and eucalyptal (EC), using trap nests made by bamboo canes, distributed in differentiated heights: 1,5 m and 5-12 m high. A total of 41 nests were collected: 31 in EC and 10 in MM, the majority in the upper strata and with the largest frequency of nesting occurring in the dry season. The sex ratio was of 1.9:1 (females/ males) in EC and of 1.08:1 in MM. About 22% of nests of the EC and 40% of MM were parasitized by Mesocheira bicolor (Fabricius 1804) (Hymenoptera, Apidae) and Coelioxys sp. (Hymenoptera, Megachilidae). The pollinic analyses showed a higher quantity of pollen grains of Banisteriopsis sp. (Malpighiaceae) and Cassia sp. (Caesalpiniaceae) in EC area and a species of Caesalpiniaceae Kunth. and Banisteriopsis Robinson in MM area

Nidificação de Centris (Hemisiella) tarsata Smith (Hymenoptera, Apidae, Centridini) em ninhos-armadilha no Nordeste do Maranhão, Brasil