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In this paper are presented notes on the primary types of some species of the oil-collecting bees of the genus Centris described by the European naturalists and entomologists Amédée Louis Michel Lepeletier de Saint-Fargeau, Anders Christian Jensen-Haarup, Arthur Louis Marie Joseph Vachal, Charles Émile Blanchard, Embrik Strand, Félix Édouard Guérin-Méneville, Guillaume-Antoine Olivier, Jean Guillaume Audinet-Serville, Jean Pérez, Johann Christoph Friedrich Klug, Johann Ludwig Christ, John Obadiah Westwood, Josef Anton Maximilian Perty, Jules Dominique, Karl Hermann Konrad Burmeister, Karl Wilhelm von Dalla Torre, Massimiliano Spinola, Peter Cameron, and Wilhelm Ferdinand Erichson. Information on the type status, type locality and depository are provided. In order to stabilize some names, lectotype designations were made for Centris rhodophthalma, C. sponsa var. asuncionis, C. transversa, Hemisia byssina and Ptilotopus americanus. Centris sponsa var. asuncionis is withdrawn from the synonymy of C. sponsa, revalidated and raised to species level. Centris byssina is proposed as nomen oblitum and as a new junior synonym of C. trigonoides, nomen protectum.
Centris xanthomelaena Moure & Castro, 2001 is a relict species, endemic to northeastern Brazil and broadly recorded within the semiarid region of Caatinga xerophilous open vegetation. It was originally included in the subgenus Paracentris Cameron, 1903 but posteriorly interpreted as remotely related to it or to the subgenus Centris s. str. Fabricius, 1804. In this paper it is proposed to recognize this species as the single member of the monotypic Relicthemisia, a new subgenus which belongs to the ‘Centris group’, one of the main internal lineages of the genus. The proposition of this new subgenus is based on both, morphological and molecular data which indicate its long history as a distinct lineage. Distribution records, floral hosts as well as photographs of both sexes of C. xanthomelaena are also provided.