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V. H. Gonzalez, P. A. Sepúlveda, and T. L. Griswold, “Taxonomic notes on American Heriades Spinola, 1808 and Leioproctus Smith, 1853 (Hymenoptera: Megachilidae, Colletidae)”, Zootaxa, vol. 3591, no. 1, pp. 75–78, Dec. 2012.