ABSTRACT. STRATlFlCATlON AND SCENTS BAITS PREFERENCES lN EUGLOSSINAE BEES (HVMENOPTERA, APlDAE). Euglossinae bees of two areas of Terra Firme forest, near Manaus, Amazonas, Brazil were studied. During one year the collections were done fortnight\y, using traps with eight kinds of scent baits. The traps were placed in the understory and in tree crowns. Some species showed a very clear vertical stratification in the fores!. The comparison between the strata studied showed that the fauna of one understory is more similar to other than fauna of crowns and the similarity between fauna of understory and fauna of crown of the the two areaswas low. Some species were specialists while most were generalists in their choice ofscent baits. Some species varied its preferences during the year. KEY WORDS . Amazonia, Euglossinae, scent baits preferences, stratificationAs primeiras observações sobre a relação de abelhas Euglossinae com orquídeas foram feitas por DARWIN (1862, apudBRAGA 1976); por CRUGER (1865) e por DUCKE (1901( , 1902( , apud MOURE 1969. Somente algum tempo depois esses estudos foram retomados por ALLEN (1950, 1954) e por PORSCH (1955 , apud MOURE 1969. Estes pesquisadores pensavam que os machos visitavam as orquí-deas para se alimentarem, dilacerando-lhes as pétalas. Entretanto, foram DODSON & FRYMIRE (1961) que notaram que os machos não dilaceravam as pétalas, mas raspavam-nas com as pernas dianteiras e retiravam substâncias que eram depositadas nas tíbias das pernas posteriores, no órgão tibial (DODSON et a/. 1969).A análise dos componentes dessas substâncias têm revelado que se tratam de odores comuns mas que possuem alguma atividade biológica ainda não suficientemente esclarecida (DODSON et a/. 1969). Esses odores podem conter muitos compostos tais como terpenóides, compostos aromáticos, compostos aminóides,
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