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Santos, L.M. and Melo, G.A. 2013. Taxonomic notes and description of the male of Xenochlora nigrofemorata (Smith, 1879) (Hymenoptera: Apidae: Halictinae). Zootaxa. 3670, 3 (Jun. 2013), 371–377. DOI:https://doi.org/10.11646/zootaxa.3670.3.7.