Apparently dependent, in a large measure, on the same circumstance (namely proximity to the coast), the _Bembidium saxatile_, Gyll., so common at the edges of the mountain streams in the north of England, in Scotland, and throughout a portion of Ireland, presents itself along our southern shores in the form of a permanent variety; being, as the Rev. J. F. Dawson remarks, "more depressed, never narrower in front (the sides therefore more parallel), whilst the colour is always much paler and the spots larger,--that before the apex being round and very conspicuous, and the anterior one occasionally expanding over the surface very considerably[24]." I have taken it in profusion on the coasts of the Isle of Wight, Dorsetshire, and Devon. And so with the _Cistela sulphurea_, Linn., which in certain maritime localities (as I have particularly noticed on the sand-hills at Deal) is liable to become so dark in colouring, that, without the intermediate shades to judge from (which however may usually be obtained _in situ_), it might stand a fair chance, occasionally, of being mistaken for a separate species. A _Psylliodes_ in Lundy Island, allied to (if not identical with) the _chrysocephala_, Linn., found in abundance on a _Brassica_ along the ascent from the eastern landing-place, varies "in every consecutive shade between the limits of light yellow and dark metallic-green[25]," the former of which states (the normal one on that rock) might have been fairly set down as specifically distinct from the latter, did not observation on the spot decide the question for us without doubt.