A new species of Mydrosomella Michener, 1986 - M. caatinguensis Ferrari, Arantes et Silveira sp. nov. is described and illustrated. The bees were collected in the municipalities of Remígio and Sumé, in the state of Paraíba, and Canindé de São Francisco, state of Sergipe, all in the semiarid domain of Caatinga, in northeastern Brazil. The type series of the species includes five females collected in...
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