by William Swainson

“ Each genus or sub-genus will be named after that species which is its peculiar type; and the new specific name of this species will imply one of its supposed natural analogies. Thus the sub-genus Protesilaus, derives its name from the typical species, while the specific name, now proposed of Leilus, points out the analogy of the group to Urania Fab. The sub-genus we now define, as being in our estimation, pre-eminently typical, retains the name of the genus. It seems also a geographic group, since all the species yet discovered belong to the old world. ”

“ In now first defining some of the natural groups of the modern Genus Papilio, it may be as well to state that we give the results of minute analysis, the details of which we hope to lay before the public on a future occasion. ”