Résumé : The 1La transitions (Clar's p band) are recorded for a series of monoaza‐aromatics. The positions and integrated intensities are shown to agree satisfactorily with the corresponding L.C.A.O. values for the transitions energies and for the transitions moments. Directions of polarization are given. Copyright © 1963 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim