Not something you need fear, but one of the most enigmatic of our dragonfly species.
August is peak flight time for the Western Spectre Boyeria irene (or l'Aeschne paisible, 'the peaceful hawker', in French). Unlike many dragonflies, which are brightly coloured, even twinkling metallic and iridescent, the Western Spectre wears full camouflage. It is dull brown and greeny-gray and is one of those species moving northwards in response to changes in the climate. It is supposedly uncommon in the Touraine, although common in Berry and Poitou. I think it is likely that in the last few years, in its move north, the Touraine du Sud has been well and truly colonised by this cryptic species.
The Western Spectre is not threatened in France and its reputation for rarity is probably down to its very discreet habits, keeping to the shade and amongst the vegetation, making it difficult to spot even though it is a large dragonfly. It has, nonetheless, been listed as Vulnerable on the European Red List. I suspect that this may be in part because this is the one widespread species of Boyeria. The others are confined to islands and are critically endangered.