Excerpt from Memoirs on the Coleoptera, Vol. 9: 1920

In defining the genera of Platyninae, a great deal of consideration must be given habital differences and peculiarities, as in the Ptero stichinae, for radical divergencies in the structure of special organs and parts of the body are comparatively rare, while the habital differences are so constant throughout large groups of species, as to indicate beyond doubt that this is the natural method to pursue in defining genera. The numerous species of A gonum, for instance, hold together remarkably well in habitus and, as a whole, present a very different appearance from Anchomenus, so that to unite the two would be quite repellant from the standpoint of what is known as the sense of proportion. So also the various species of Euro philus, which in this case are distinguished, besides habitus, by a well marked special antennal structural character, form a very consistent whole, differing greatly from Anchomenus and showing that they form a truly valid genus.

The Platyninae form an extensive and important element in the Carabid fauna of the northern hemisphere, but are very much more developed in North America than in Europe. The genus Platynus Bon., itself, I hold to be exclusively European, our Wingless species constituting three or more allied genera, of which Rhadme Lec., stands widely apart in general appearance from any other type of the subfamily.

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