. Bulletin of zoological nomenclature. 256 BuUetin of Zoological Nomenclature In another instance (used below as an example) the family-name which has to be replaced is based on a generic name which is a junior homonym, but again the result of Decision 54 would be similar, for it would necessitate rejecting the universally accepted name of the family in favom* of one based on a genus which certainly belongs to a different subfamily and which is regarded by some authors as belonging to a different family. 3. All siphonapterologists, in common with what I behave to be the great majority of zoolo
. Bulletin of zoological nomenclature. 256 BuUetin of Zoological Nomenclature In another instance (used below as an example) the family-name which has to be replaced is based on a generic name which is a junior homonym, but again the result of Decision 54 would be similar, for it would necessitate rejecting the universally accepted name of the family in favom* of one based on a genus which certainly belongs to a different subfamily and which is regarded by some authors as belonging to a different family. 3. All siphonapterologists, in common with what I behave to be the great majority of zoologists, have taken the view that such changes in the basic concept of a family-group taxon are undesirable in the highest degree, and I can only assume that the rejection by the Copenhagen Congress of the principle that the identity of a famUy-group taxon must be maintained through aU nomenclatorial vicissitudes must have been due to the obvious awkwardness of attributing to a name an authorship and date which are not in accordance with fact and which reference to the work cited would show to be incorrect. There is a very real difficulty and I have tried to deal with it in a further proposal which I am submitting herewith.^. 4. In order to ensure that the type-genus of a family-group taxon shall not be changed because of some nomenclatorial discovery, I suggest the following provision :— Where a famUy-gi'oup name is rejected on the groimd that the name of its type genus is either (i) a junior synonym (either objective or subjective) of an older generic name or (ii) a junior homonjTn of an older generic name, the family-group name pubhshed in substitution for the name so rejected shall rank for the purposes of priority from the date on which the rejected famUy- group name for which it is a substitute was originally published. Example : The family-group name ctenopsyludae was published by Baker in 1905 for a taxon based on the generic name Ctenopsyllus Kolenati, 1863 (a junior h
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