But they are yellow, not "redish brown". And they are less than 3 mm long, the majors are at most 2,5, minor workers even below 2 mm. And most important, they are strictly underground ants, workers go outside only during mating flight to escort flyers.
Hi Tail
Things that need to be considered here:-
It was a long time ago. I did not stay to watch them in any detail. I wish I had paid closer attention. I am also colour blind. But I do remember these were very small ants (light coloured) moving in a stream from one opening to another about a foot apart. This took place on a clif top somewhere near dorset. The fact that they are a purely underground dwelling species makes my identification potentially null and void.
Oh well cheers Tail. Back to uncertainty again.
Oh to be able to turn back the clock.
It could very well be these ants as you thought, even Lasius Flavus may travel above ground ocasionally, but unless it's a very temporary path they'll quickly cover their "highway" over with sand or so to make it into a tunnel. So since this path you saw was only about a foot in length this could very well be a sub-surface dwelling species.
Thanks Zagone, but I have been collecting ants for 30 plus years and these were deffinitely not Lasius Flavus. Lasius Flavus are another subteranean species and only come to the surface during mating flights. I have observed the occassional worker above ground.
I didn't mean to say it was, I was just making an example that even ants that primarily live under the surface, might show up above ground aswell. :D