Reduced transition probabilities for electric monopole transitions ϱ 2 have been calculated using a collective model with deformation vibrations but no asymmetry vibrations. Both ϱ 2 and X = ϱ 2e 2R 0 4 B( E2) have been evaluated within the context of the model by exact numerical methods for transitions within positive as well negative parity rotational bands of even nuclei. Comparison of experiment with theory shows quite good agreement in the actinide deformed region; however, for the rare earths theoretical predictions are generally an order of magnitude greater than the measured values.