“…Although most species are considered solitary (Zucchi et al, 1969;Dressler, 1982;Kimsey, 1987;Michener, 2000;Cameron, 2004), the presence of more than one female in the nests of some species has suggested the occurrence of some kind of social organization in those nests (Dodson, 1966;Roberts and Dodson, 1967;Sakagami et al, 1967;Zucchi et al, 1969;Olesen, 1988;Eberhard, 1988;Otero, 1996). Studies on the nesting behavior of Euglossa cordata (Linnaeus) (Garófalo, 1985(Garófalo, , 1987(Garófalo, , 1992Augusto, 1993;Augusto and Garófalo, 1994), Euglossa atroveneta Dressler (Ramírez-Arriaga et al, 1996), Euglossa annectans Dressler (Garófalo et al, 1998), and Euglossa hyacinthina Dressler (Soucy et al, 2003) have shown that new nests are usually established by solitary females and that the occurrence of multifemale nests is the result of nest re-use by succeeding generations.…”