Carvalho Filho, F. da S. “Scent-Robbing and Fighting Among Male Orchid Bees, Eulaema (Apeulaema) Nigrita Lepeletier, 1841 (Hymenoptera: Apidae: Euglossini)”. Biota Neotropica, vol. 10, no. 2, June 2010, //www.biotaneotropica.org.br/BN/article/view/708.