so much black on the thorax so have plumped for highland darter form of common darter but how do you distinguish from female black darter?
No interactions present.
I think the advice from BDS is that nigrescens is just a form of striolatum, which makes life a lot simpler!
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 56.0844, -5.4811
OS grid ref: NR835934