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Waterhouse has read paper to show (May 45) that typical genera (ie with organs well balanced are mundane of wide distribution, some peculiar to temperate & some to tropical climate — that are aberrant few in number of species (NB which makes them aberrant) have narrow ranges. (ie they are groups which are becoming exterminated. All this deduced from insects = same as Hooker. = But there is exception in water insects, which have all wide generic distribution & in parasitic insects as in Chalcidicæ.

Stylops & Earwigs opposed to this.—

Waterhouse remembered that in great groups.— most of the genera, might be reduced to one, 2, or 3 or 4 main types, with some quite different character — thus tapir — pig & horse, 3 groups which will include almost all— tapir including most.