Pincertailed dragonflies are so called because of the very obvious pincer on the end of the male's abdomen. This species, the Small Pincertail Onychogomphus forcipatus is by far the most common and widespread in Europe. It's French name is le Gomphe à pinces.
Males can often be seen posing on stones by the waterside, raising their tails to make sure their 'gear' is noticed. The species varies a bit in colouration, with eyes that can be blue or green and with yellow markings that can range from dull to bright. Their favoured habitat is sunny streams with gravelly or rocky edges, but I have seen them patrolling the streets of Preuilly on a number of occasions.
A newly emerged female can be seen here, photographed on the Creuse river.