Abstract
The genera Galactosomum, Microlistrum and Stictodora are compared, and, while the first two are undoubtedly synonymous, the last is considered to be distinct.The adult of the type-species of Galactosomum, G. lacteum, is fully described for the first time from European cormorants, and G. phalacrocoracis is regarded as a synonym.A new species, Galactosomum fregatae, is described from the frigate-bird Fregata magnificens rothschildi.The characters of all the species that have been assigned to Galactosomum are briefly defined, and a provisional differential key is given.

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