Having spotted Beautiful Demoiselle earlier this month Jonathan Groom has returned to Rea Brook to find Beautiful and Banded Demoiselle- the latter shown below.
The guide books highlight the different habitats preferred by these species- typically slow flowing streams and rivers with muddy sediment for the Banded Demoiselle and faster flowing sand/gravel based streams for the Beautiful Demoiselle. They do however occur together as seen by Jonathan where patches of sand or gravel are present alongside muddier substrates.