I am astonished to discover that I have never featured one of the most common of the blue damselflies on the blog! This photo is from last year, but they should be out and about around Preuilly now. They can be distinguished from the Common Blue Damselfly by the characteristic 'U' shaped mark on their second abdominal segment.
They can be seen from May to August around well vegetated margins of ponds, lakes, ditches, canals and slow-moving rivers as well as sunlit hedge banks, field margins and woodland glades.
By the way, if you are interested in keeping up to date with French Odonata (Dragonflies), there is a very good (fairly new) blog called Chasseur de Dragons (thanks to its author, Geeko, for bringing it to my attention).
The Naming of Names:
Azure Bluet - known as the Azure Damselfly in the UK.
Coenagrion puella - 'coen' = 'common', 'agrion' = 'wild'; 'puella' = 'girl'
L'Agrion jouvencelle - 'jouvencelle' = 'adolescent'