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