International Commisision on Zoological Nomenclature. 1955. Opinion 328. Suppression under the Plenary Powers, of the specific name “caesius” Cloquet, 1818, as published in the combination “Coluber caesius”, for the purpose of validating the specific name “irregularis” Leach, 1819, as published in the combination “Coluber irregularis” (Class Reptilia, Order Squamata). pp. 299–308 InHemming, F. (ed.). Opinions and declarations rendered by the International Commission on Zoological Nomenclature. Volume 9, part 20. International Trust for Zoological Nomenclature: London. 416 pp. BHL