Revisions of the Mallophaga genera. Degeeriella from the Falconiformes

The characters and distribution of the Degeeriella - complex are discussed. Degeeriella sens. str., as found on the Falconiformes, is described. Variations and artefacts, characters of taxonomic importance and the concept of the subspecies in this group are considered. A systematic survey of all known species is given followed by a key and notes on names of which the correct interpretation is doubtful. Finally some suggestions are made on possible relationships within the Falconiformes based on the distribution of the Mallophaga.