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We report on a hierarchy of temperatures Tc < Tgap < Tmet in superconductingRb1-xFe2-ySe2 observed by THz spectroscopy. Above Tmet = 90 K the materialreveals semiconducting characteristics. Below Tmet a coherent metallic THzresponse emerges. This metal-to-insulator type, orbital selective transition isclearly indicated by an isosbestic point in the temperature dependence of theoptical conductivity and dielectric constant at THz-frequencies. At Tgap = 61 Ka gap opens in the THz regime and then the superconducting transition occurs atTc = 32 K. This sequence of temperatures seems to reflect a correspondinghierarchy of the electronic correlations in the different bands.

Orbital-selective metal-insulator transition and gap formation above Tc in superconducting Rb1-xFe2-ySe2