TAXONOMIC POTENTIAL OF THE CHEMICAL CONSTITUENTS IN THE CEPHALIC MARKING SECRETIONS OF BOMBUS AND PSITHYRUS SPECIES (HYMENOPTERA, APIDAE) : A NUMERICAL TAXONOMIC STUDY Xavicr BELLÉS, Alegría GALOFRÉ and Antonio GINEBREDAApidologie, 18 3 (1987) 231-242DOI: https://doi.org/10.1051/apido:19870303
